CN103712932A - Multi-channel optical absorption detection device - Google Patents
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- CN103712932A CN103712932A CN201310755884.7A CN201310755884A CN103712932A CN 103712932 A CN103712932 A CN 103712932A CN 201310755884 A CN201310755884 A CN 201310755884A CN 103712932 A CN103712932 A CN 103712932A
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Abstract
The invention relates to a multi-channel optical absorption detection device for gas detection. The multi-channel optical absorption detection device comprises two concave reflecting mirrors mounted on a housing, wherein the two concave reflecting mirrors are coaxially oppositely arranged, the optical axes of the two concave reflecting mirrors are mutually superimposed, and the curvature radiuses are equivalent. A plurality of pairs of through holes are formed on one of the concave reflecting mirrors, and the plurality of the pairs of the through holes are formed along the peripheral direction of the reflecting mirror. The center-to-center connection line of the hole pair of each pair of the through holes passes through the center of the mirror surface of the reflecting mirror, one through hole in each through hole pair is used for detecting an incident hole of a light beam, the other through hole in each through hole pair is used for detecting an emergent hole of the light beam, each pair of the incident hole and the emergent hole and the two reflecting mirrors constitute one detection channel, and the envelope section of the return shape of the light beam of each detection channel is oval. The multi-channel optical absorption detection device provided by the invention has a simple structure, one detection device can synchronously perform multi-component gas detection, the cost is low, the multi-component gas detection efficiency is high, and the multi-channel optical absorption detection device is applied to the technical fields of gas monitoring, detection, gas absorption spectrum analysis and the like.
Description
Technical field:
The invention belongs to optics and spectroscopy technology field, relate generally to the optical absorption means detecting for gas, specifically a kind of Multi-channel optical absorption detecting device.Be applied to the technical fields such as multicomponent gas monitoring, detection and gas absorption spectroanalysis.
Background technology:
The gaseous spectrum absorption process that use in the gas composition monitoring of using in petrochemical industry process control and atmospheric environment pollution monitoring more.For industrial flammable explosive gas and Pollution Gas monitoring, all exist the requirement that detection sensitivity is high.In actual monitoring process, use long-range optical absorption means to improve detection sensitivity.In gas-monitoring, relate to the synchronous detection of multicomponent gas.At present, realize the monitoring to Multicomponent synchronic gas and need to use a plurality of optical absorption means, each absorption plant only can detect single component gases, comprehensively obtains the testing result of multicomponent gas; Or adopt single channel absorption plant to divide multiplex technique to realize the detection to multicomponent gas in conjunction with optical fiber, wherein single channel absorption plant divides multiplex technique to carry out the monitoring of Multicomponent synchronic gas in conjunction with optical fiber also to relate to complicated circuit signal Synchronization Design, cause system complexity and detection to involve great expense, bring many inconveniences to detection operation and operation, the more important thing is that detection causes the precision of detection and stability to reduce more, is restricted applying of spectral absorption detection technique.
Science and technology report document and patent about multi-channel gas absorption cell are more rare.Patent documentation (US8299433) proposes a kind of Multi-channel optical absorption cell.This absorption cell utilizes the object lens of a field lens and multiaspect symmetric offset spread to realize multichannel optical texture, this scheme realizes binary channels needs four sides object lens, realize triple channel and need six object lens, in reality, use this scheme to have complex structure, bulky, the technical barriers such as cost costliness and Installation and Debugging difficulty.
The present patent application people is on the internet with regard to this theme, and at home and abroad patent documentation and the journal article retrieval of publishing, not yet find report or the document closely related and the same with the present invention.
Summary of the invention:
The present invention seeks to the optical absorption means complex structure existing in multicomponent gas monitoring prior art, the problem that efficiency is low-cost high, the only multi-channel structure of two-face mirror of a kind of optical absorption means is provided, unitary device can synchronously be carried out detection of gas with multiple constituents, detection efficiency is high, the Multi-channel optical absorption detecting device that gas detecting system cost is low.
Below the technical solution used in the present invention is briefly described:
For the urgent need to multicomponent gas Simultaneous Monitoring in current environment monitoring and industry monitoring, and prior art cannot meet the multiplexing efficient detection demand in single pond, by innovating and researching and developing, propose a kind of device that through engineering approaches realizes that is easy to, a table apparatus can be to the synchronous Multi-channel optical absorption detecting device detecting of multicomponent gas.
The present invention is a kind of Multi-channel optical absorption detecting device, the catoptron that includes housing and be mounted thereon, optical absorption pick-up unit is provided with into perforation and perforation hole, two sides concave mirror in the present invention is coaxially staggered relatively, the reflector curvature radius of two sides concave mirror equates, in the present invention, on a concave mirror, be provided with multipair through hole, hole is not set in another concave mirror.In every a pair of through hole, one of them through hole enters perforation for detecting light beam, and this is detection light beam perforation hole to another through hole in through hole.Detection light beam is repeatedly turned back between two sides concave mirror staggered relatively by every a pair of through hole and is formed an optical absorption passage, each channel application is in a kind of detection of specific gas composition, a plurality of detection light beams whole Multi-channel optical absorption detecting that forms of repeatedly turning back in two concave mirrors.Multipair through hole of the present invention circumferentially arranges along a mirror surface wherein, the mid point of every a pair of through hole line of centres all with the center superposition of concave mirror.Every a pair of through hole forms a kind of gas absorption passage, gas absorption passage also can be described as optical absorption passage, each channel application is in a kind of detection of specific gas composition, and multi-channel gas optical detection apparatus of the present invention has been realized a kind of device and multiple gases carried out to optical absorption simultaneously and synchronously detect.
The present invention adopts two sides concave mirror coaxially staggered relatively, only on a catoptron, offers through hole pair, has very simple structure, and can realize a fairly large number of hyperchannel, and be easy to through engineering approaches realization and application.
Realization of the present invention is also: two Multi-channel optical absorption detecting devices that concave mirror staggered relatively forms, the ray envelop cross section of turning back that the detection light beam of each optical absorption passage repeatedly turning back between the concave mirror of two sides forms is for oval.The beam cross section face of turning back type in absorption plant of the present invention is for oval, and the incident and the shooting angle that detect light beam are insensitive to two-face mirror change of distance, facilitate Installation and Debugging.
Realization of the present invention is also: the reflector type of each catoptron or sphere, or parabola or ellipsoid.The present invention does not do unitary request to the reflecting surface face type of catoptron, is convenient to conveniently through engineering approaches and realizes.
Realization of the present invention is also: along the multipair through hole of mirror surface circumferential arrangement, multipair through hole hole is to along circumferential arrangement.This technical characterictic of the present invention can effectively utilize minute surface area, the detection light beam that existing single channel optical absorption detects is turned back the enveloping surface that forms for circular, if while therefore single channel optical absorption means being carried out to Multi-channel extension, detect through hole and can not be arranged on circumferencial direction, no matter be that symmetry or asymmetry expansion all can only be carried out Multi-channel extension along single diametric(al), other diametric(al)s cannot extended channel, otherwise can cause a certain detection light beam to overflow along the through hole of another sense channel, cause the systematic error of detection, thereby the expansion of limiting channel, quantity and the space of passage expansion are all very limited, and designing and calculating is complicated, under this technical scheme, need relatively large tunnel holes aperture, also limited effectively expanding space of passage, passage of the present invention circumferentially arranges along equal diameter, effective and feasible, while being especially symmetrical arranged, only need the simple computation design of a passage, when increase sense channel is counted, only need to process along equal diameter circumferential arrangement according to the channel position parameter having designed, can meet the incident and the outgoing condition that detect light beam, light path adjustment is also simple, being easy to realize multicomponent gas detects, improve gas and detect the efficiency of analyzing.
Realization of the present invention is also: the right hole of each through hole of hyperchannel through hole centering can equate centre distance also can be unequal, forms the multilayer equal diameter circumferential arrangement through hole pair along minute surface center.The present invention is the unequal setting to centre distance to hyperchannel through hole hole, is beneficial to the useful area that utilizes minute surface, further improves port number and detection efficiency.
The through hole that each passage of the present invention is arranged by two radial symmetry is respectively realized and is detected light beam input and output, and the right technical scheme of hyperchannel through hole is set on the minute surface of a catoptron.And use single through hole to realize in prior art, detect light beam input and output, cause the input of peripheral detection light beam and survey optical device installing space crowded, or adopt complicated mechanical-optical setup to realize the light beam coupling input and output of single through hole, not only cause whole detection system bulky and complicated, and multichannel Project Realization is restricted.The radial symmetry of input and output through hole of the present invention is arranged, make input detect beam optical transmission apparatus and both sides, output beam sensitive detection parts office, effectively utilize space, eliminate input/output beam narrow by the be coupled peripheral optics device arrangements that causes of single through hole, improve space availability ratio, increase port number, simplify light path adjustment.
The present invention only therein a concave mirror be provided with multipair through hole, a through hole in every a pair of through hole enters perforation for detecting of light beam, another through hole is for detecting a perforation hole of light beam; Every a pair of through hole is an optical absorption passage, or claims optical detection passage.The through hole that each passage is arranged by two radial symmetry is respectively realized and is detected light beam input and output.The present invention only settles through hole on mirror, can avoid two sides mirror to place respectively Position Design and the adjustment difficulty of a passage input and output through hole, is convenient to adjustment and installation, and improves and assurance installation accuracy.
Realization of the present invention is also: multichannel preferred setting is selected in 2 passage to 8 passages.Can be at 2 passages to selected in unlimited a plurality of passages on hyperchannel realization theory of the present invention, in engineering, realize according to how many definite port numbers of gaseous species with 2 to 8 passages as more preferably selecting.
Relative prior art, the present invention has the following advantages:
1. the hyperchannel of Multi-channel optical absorption plant is along mirror surface center multilayer equal diameter circumferential arrangement, make full use of the limited area of minute surface of catoptron, effectively expand the quantity of sense channel, unitary device can synchronously be carried out detection of gas with multiple constituents, and detection efficiency is high;
2. each passage of Multi-channel optical absorption detecting device, along mirror surface equal diameter circumferential arrangement, only needs a channels designs, can realize along being circumferentially arranged symmetrically with the realization of passage, and hyperchannel design simplification, passage expansion is row easily;
3. each passage of the present invention comprises two concave mirrors and a pair of through hole on a catoptron wherein, and incident beam enters from entering perforation, between two concave mirrors, repeatedly turns back, and by perforation hole outgoing, realizes the detection to a kind of gas.Right two through holes of through hole of the present invention are about minute surface Central Symmetry, and be easy to processing, install, location and debugging, and convenient peripheral input and survey the compact mounting arrangements of photoelectric device;
4. detection light beam the turning back in absorption plant of each passage of the present invention is shaped as envelope cross section for oval, fully uses the space between two catoptrons, increases the kind that optical absorption means gas detects;
5. each sense channel of the present invention only needs two sides concave mirror, simplifies Multi-channel optical absorption plant structure, reduces the manufacturing cost of Multi-channel optical absorption detecting device.
Accompanying drawing explanation:
Fig. 1 is Multi-channel optical absorption detecting apparatus structure schematic diagram of the present invention, is also the vertical view of two passage optical absorption pick-up units in embodiment 1-12;
Fig. 2 is the left view of Fig. 1, in figure and be attached with the two passages light path schematic diagram of turning back;
Fig. 3 is that the two passage optical absorption that the present invention realizes detect skeleton view;
Fig. 4 is the non-equidistant placement schematic diagram of optical detection passage of the present invention;
Fig. 5 is triple channel optical absorption pick-up unit schematic diagram of the present invention, and the additional triple channel light path of turning back;
Fig. 6 is eight passage optical absorption pick-up unit schematic diagram of the present invention, and the additional eight passages light path of turning back.
Embodiment:
Below in conjunction with accompanying drawing to the detailed description of the invention:
The present invention is a kind of Multi-channel optical absorption detecting device, the catoptron that includes housing 3 and be mounted thereon, optical absorption pick-up unit is provided with into perforation and perforation hole, two sides concave mirror is coaxially staggered relatively, between two concave mirrors staggered relatively, form Multi-channel optical absorption detecting, referring to Fig. 1, coaxial have the 1st concave mirror 1 and the 2nd concave mirror 2 staggered relatively, 3 pairs of two-face mirror of housing are installed fixing, the whole Multi-channel optical absorption detecting device 4 that forms.Optical absorption pick-up unit 4 also referred to as optical absorption means also referred to as gas absorbing device.In this example, the reflector type of each catoptron is all spheres, the reflector curvature radius of two sides concave mirror equates, wherein a concave mirror is provided with multipair through hole, in this example, be two pairs of through holes, a through hole in two pairs of through holes in every a pair of through hole enters perforation for detecting light beam, referring to entering perforation 5a in Fig. 1, another through hole is for detecting light beam perforation hole, referring to the perforation hole 5b in Fig. 1, every a pair of through hole, as through hole 5a and an optical absorption passage of through hole 5b formation, each channel application is in a kind of detection of specific gas composition, detect the light beam integrally formed Multi-channel optical absorption detecting of repeatedly turning back in two concave mirrors.The present invention only uses the coaxial formation Multi-channel optical absorption detecting device staggered relatively of two sides concave mirror, simplifies Multi-channel optical absorption detecting apparatus structure, reduces the manufacturing cost of Multi-channel optical absorption detecting device.
The ray envelop cross section of turning back that in the present invention, the detection light beam of each gas absorption passage repeatedly turning back between the concave mirror of two sides forms is for oval, referring to Fig. 2.
The multipair through hole of the present invention is along the center circumferential arrangement of mirror surface, the center of every a pair of through hole line all with the center superposition of concave mirror, see Fig. 2, the optical axis of catoptron and the center superposition of catoptron.In this example, multipair through hole is two pairs, and two pairs of through holes are along the symmetrical circumferential arrangement of mirror surface, and in these two pairs of through holes, each through hole is to the line of centres apart from equating, the perforation that enters of first pair of through hole is 5a, and perforation hole is 5b; The perforation that enters of second pair of through hole is 6a, and perforation hole is 6b, and light beam 7 enters from 5a, by repeatedly turning back of the 1st concave mirror 1 and the 2nd concave mirror 2 two-face mirror, through 5b outgoing, light beam 8 enters from 6a, by repeatedly turning back of two-face mirror, through 6b outgoing, referring to Fig. 1 and Fig. 2.When Multi-channel optical absorption detecting device of the present invention is during to relevant gas detecting system connection work, outgoing beam is received by photodetector, by computing machine, is processed and is provided testing result.
When the many components of gas are detected, available technology adopting single channel gas long-range absorption plant, quantity required is many, the complicated problem with involving great expense of system architecture causing, the present invention is by design and the optimization of optical texture and optical delivery pattern, effectively simplify multicomponent gas spectral absorption structure of the detecting device, also simplified the formation of whole detection system.Unitary device of the present invention can synchronously be carried out detection of gas with multiple constituents, and detection efficiency is high.The present invention can be widely used in multicomponent gas monitoring and spectral analysis workplace.
The formation of Multi-channel optical absorption detecting device and structure are with embodiment 1, absorption detecting apparatus structure of the present invention is simple, comprise: be arranged on the two sides concave mirror on housing 3, two sides concave mirror is coaxially staggered relatively, the optical axis of two concave mirrors overlaps, and the reflector curvature radius of two-face mirror equates.Two sides concave mirror wherein arranges multipair through hole in one side, and multipair through hole is along mirror surface circumferential arrangement.The hole line of centres of every pair of through hole is by the center of minute surface, a through hole in every a pair of through hole is for detection of the perforation that enters of light beam, another through hole is for detection of the perforation hole of light beam, an optical detection passage of the common composition of every a pair of incident hole, perforation hole and two-face mirror, the light beam of each sense channel is turned back repeatedly, and the formed ray envelop cross sectional shape of turning back is repeatedly for oval.
Two sides concave mirror is coaxially staggered relatively, and concave mirror coaxial distance staggered relatively in two sides is relevant to the radius-of-curvature of catoptron, apart from choose by
choose, in formula, L is the centre distance of two-face mirror, and R is the radius-of-curvature of catoptron.Distance between two minute surfaces is relevant to the radius-of-curvature of catoptron, referring to Fig. 1, the restriction of factor such as is processed, and after the radius-of-curvature of catoptron is determined, utilizes formula
distance between mirrors is that the centre distance of two-face mirror is determined thereupon, and wherein r is the right hole centre distance of through hole, namely the right hole line of centres length of through hole.
Embodiment 3
The formation of Multi-channel optical absorption detecting device and structure are with embodiment 1-2, and in this example, the reflector type of two catoptrons is parabolas, and just the different catoptron of face type need to configure different housing 3, makes both reliable and stable connections.
Embodiment 4
The formation of Multi-channel optical absorption detecting device and structure are with embodiment 1-3, and in this example, two pairs of through holes are along mirror surface circumferential arrangement.Referring to Fig. 1, on the 1st concave mirror 1, along reflecting surface, circumferentially have the through hole pair that enters perforation 5a and perforation hole 5b that detects light beam, and the through hole pair that enters perforation 6a and perforation hole 6b, the center of two hole lines that each through hole is right is by the center of catoptron, and two right hole Central Symmetries of each hole are distributed on a diameter of catoptron.Two hole pair: 5a and 5b, 6a and 6b respectively form an optical detection passage.For prevent from detecting the light beam leakage of turning back between minute surface, enter perforation or perforation hole and get 0.3～0.4d to the distance at catoptron center, the diameter that d is mirror aperture, the i.e. diameter of the 1st concave mirror 1 and the 2nd concave mirror 2.In this example, enter perforation or perforation hole and get 0.4d to the distance at catoptron center, referring to Fig. 1.The present invention is along being circumferentially arranged symmetrically with passage, and hyperchannel design simplification is easily gone.In addition, the present invention is easy to processing, installs, locates and debugging, and the compact mounting arrangements of convenient peripheral input and detection photoelectric device.
Embodiment 5
The formation of Multi-channel optical absorption detecting device and structure be with embodiment 1-4,
In this example, multipair through hole is two pairs, two pairs of through holes are along the symmetrical circumferential arrangement of mirror surface, and in these two pairs of through holes, the right distance of each through hole equates, shown in Figure 2, for first passage, detect light beam 7 and be coupled into optical absorption pick-up unit 4 by entering perforation 5a, incide on catoptron 2, catoptron 2 reflections detect light beam to catoptron 1, and catoptron 1 is again detecting beam reflection to catoptron 2.Detect light beam 7 repeatedly turns back between catoptron 1 and catoptron 2, until being reflected mirror 2, detection light beam reflexes to 5b in perforation hole, through perforation hole 5b, be coupled out optics absorption plant 4, in like manner, the detection light beam 8 of second passage is also coupled out optics absorption plant 4 through perforation hole 6b.According to paraxial optics principle, light beam between two-face mirror is turned back and can by the identical compound lens of focal length, be solved with light beam, if light beam is through turning back for n time between two-face mirror, what available focal length was identical solves the refraction of optical beam position of the n time at a distance of the individual coaxial compound lens of the n of L between two, the position of the n time refraction point, under rectangular coordinate system, can represent with following formula respectively: x
n=Acos (n θ+α), y
n=Bsin (n θ+β), above-mentioned parameter the Representation Equation is
wherein A is the major axis dimension in the elliptical profile cross section that light beam forms of turning back, and B is the minor axis dimension in the elliptical profile cross section that light beam forms of turning back, and C is constant, is taken as C=1 in design,
x wherein
0and y
0be respectively the position coordinate parameters into perforation,
with
be respectively incident beam cosine slope, θ is that continuous two of light beam is turned back a little with respect to the angle at concave mirror center, α and β are the phase angles relating in theoretical calculating, in design, be all taken as zero, as shown in Figure 2, the ray envelop that each passage is repeatedly turned back forms ellipse cross section, and the present invention makes full use of the space between two catoptrons, increases the kind that optical absorption means gas detects.By the Multi-channel optical absorbing path of a gas-detecting device, can carry out detection of gas with multiple constituents, cost is low, and detection of gas with multiple constituents efficiency is high, is applied to gas-monitoring, the technical fields such as detection and gas absorption spectroanalysis.
Embodiment 6
The formation of Multi-channel optical absorption detecting device and structure are with embodiment 1-5, the reflector type of two sides concave mirror is parabola, four pairs of through holes along mirror surface circumferential arrangement are non-homogeneous circumferential arrangement, the present invention fully uses the space between two catoptrons, increases the kind that optical absorption pick-up unit gas detects.In this example, enter perforation or perforation hole and get 0.3d to the distance at catoptron center.
Embodiment 7
The formation of Multi-channel optical absorption detecting device and structure are with embodiment 1-6, the reflector type of two sides concave mirror is ellipsoid, edge is two pairs of through holes of a mirror surface circumferential arrangement wherein, the right hole centre distance of two through hole is unequal, referring to Fig. 4, the right hole of 5a-5b through hole is greater than the right hole of 6a-6b through hole to centre distance to centre distance.The present invention is the non-isometric limited area that still makes full use of minute surface to centre distance by through hole, further improves scope and efficiency that optical absorption pond is detected gas.
Embodiment 8
The formation of Multi-channel optical absorption detecting device and structure are with embodiment 1-7, and referring to Fig. 2, the number of turns that detects light beam is shown with the angle measuring gauge of the once rotation of turning back
θ is continuous two and turns back a little with respect to the angle at concave mirror center, M detects light beam relatively to enter perforation to the number of times of the Rotate 180 degree centered by catoptron of reflection spot between perforation hole, and N is the number that detects light beam reflection spot on the first concave mirror 1 or the second concave mirror 2.For M of the present invention, be necessary for odd number, N is necessary for even number.The optical path length of each sense channel can equate, also can be unequal.By the different values of N and M, realize the different optical path length of the different passages of Multi-channel optical absorption plant.According to light beam, the number of turns N in absorption plant is multiplied by the estimation that following formula carries out first summary to the light path of the detection light beam of each passage in absorption plant.
In formula, l is any the turn back air line distance of 2 of one-time continuous between two concave mirrors, referring to Fig. 3.When known detection light path and mirror curvature radius R, N count be detect light beam therein turning back on mirror count, also be to detect the number of times that light beam is turned back, suppose that distance between mirrors is L, N value that can be approximate with the ratio of light path and distance between mirrors L, conventionally establish between two sides concave mirror distance L and two concave mirrors the turn back air line distance l of 2 of one-time continuous arbitrarily and equate, by above formula, can calculate M, by
formula further can draw and detect the angle θ that light beam is turned back and once rotated, according to the angle θ of rotation, can calculate incident angle and the shooting angle that detects light beam.
This formula proving is based upon on the basis of linear hypothesis, because the detection light beam light path of each passage is to be based upon on the basis of linear hypothesis, arbitrarily the turn back air line distance of 2 of one-time continuous has certain error, the specific rule of Bel-Lang Bo detecting according to optical absorption, the size of gas absorption signal is directly proportional to the density of detected gas and light path, with N * l light path formula, can complete the not high gas composition of accuracy requirement measures, during accurate measurement gas component, can use laser range finder accurately to measure the light path of each passage.
Embodiment 9
The formation of Multi-channel optical absorption detecting device and structure be with embodiment 1-8, and referring to Fig. 2, the incident angle that detects light beam utilizes the location parameter of perforation and detection light beam at the rotated angle θ that turns back for the first time on minute surface, and 5 x in conjunction with the embodiments
nand y
nformula determines that detecting light beam first reflection location parameter simultaneous calculates the incident angle that detects light beam; The shooting angle that detects light beam only needs the location parameter of perforation hole and the x of embodiment 5
nand y
nformula determines that last reflection position simultaneous calculates.Because the optical design of absorption detecting device at present generally adopts paraxial optics, calculate, last in actual design, the best optical design software such as ZEMAX that adopt are carried out simulating, verifying, can effectively improve design accuracy.Because the present invention adopts, the right technical scheme of through hole is circumferentially set, the process of through hole processing on concave reflection minute surface, as adopt behind 3 coordinates or hole of 5 coordinate Cutter Body Processing with Machining Center, only need the chuck rotation given angle of clamping catoptron can process continuously next through hole, complete this circumferential arrangement through hole to processing.
Actual while carrying out gasmetry, using laser as detecting light beam, laser detection light beam enters multi-channel gas pick-up unit by entering perforation, after repeatedly turning back between the concave mirror of two sides, by perforation hole, exported, the photodetector that Output of laser detects the detected system of light beam receives, and then provides testing result by treatment circuit.The aperture that enters Perforation and perforation hole is slightly larger than the diameter of laser beam.
Embodiment 10
The formation of Multi-channel optical absorption detecting device and structure, with embodiment 1-9, detect when needing CH4 and two kinds of gas ingredients of H2S in gas gathering and transportation process.Adopt two passage optical absorption pick-up units of the present invention, in the time of to CH4 and two kinds of gas ingredients of H2S, detect, in this example, two of two passages pairs of through holes are along the symmetrical circumferential arrangement of mirror surface, referring to Fig. 2, passage 5 is for the detection of CH4 gas, and passage 6 is for the detection of H2S gas, and vice versa.Quantitatively little 2 orders of magnitude of absorption coefficient of the relative CH4 of absorption coefficient of H2S, and detection sensitivity is directly proportional to absorption coefficient and light path, in order to improve the detection sensitivity of H2S in same optical absorption pick-up unit, light path for H2S gas sense channel is increased, be multiplied in this example N or M can extend the light path of H2S passage, and then improved the detection sensitivity of H2S passage.
For detection of certain gas componant, the selection by detection light source determines concrete certain passage.
Embodiment 11
The formation of Multi-channel optical absorption detecting device and structure are with embodiment 1-10, the binary channels optical absorption means of structure as above is only an example, Multi-channel optical absorption detecting device can be designed to triple channel, four-way or more passage, passage number depend on the quantity of detected gas component.Shown in Fig. 5 is the schematic diagram of triple channel optical absorption means, similar to binary channels optical absorption means, triple channel optical absorption means comprises that two sides radius-of-curvature is identical, light shaft coaxle, in a distance and reflecting surface catoptron staggered relatively, the reflecting surface face type of two catoptrons can be sphere, parabola or ellipsoid etc., on the first concave mirror 1, have three couples of through hole 5a-5b along mirror surface circumferential array, 6a-6b and 7a-7b, the relative mirror surface Central Symmetry in two holes of every a pair of through hole, and the line of centres of two through holes is positioned on the diameter of mirror aperture, three pairs of through holes are along circumferentially can symmetry also can asymmetricly placing.Every a pair of through hole forms a sense channel.For example: a passage 5a-5b detects for CO, and a passage 6a-6b is used for the detection of CO2, and a passage 7a-7b is used for the detection of O2.
Embodiment 12
The formation of Multi-channel optical absorption detecting device and structure are with embodiment 1-11, the triple channel optical absorption pick-up unit of structure as above is only along example of circumferential arrangement optical channel, hyperchannel absorption plant can also comprise different pore size circumferential arrangement, expands as required more passage.Shown in Fig. 6 is the schematic diagram of eight passage optical absorption means, similar to triple channel optical absorption means, eight passage optical absorption means comprise that two sides radius-of-curvature is identical, light shaft coaxle, in a distance and reflecting surface catoptron 1 and catoptron 2 staggered relatively, the reflecting surface face type of catoptron is sphere, on catoptron 1, have eight couples of through hole 5a-5b along two kinds of diameters of mirror surface circumferential array, 6a-6b, 7a-7b, 8a-8b, 9a-9b, 10a-10b, 11a-11b and 12a-12b, radial distribution at catoptron 1 is 2 layers, the relative mirror surface Central Symmetry in two holes of every a pair of through hole, and the line of centres in two holes is positioned on the diameter of mirror aperture, every layer of four pairs of through hole is along circumferentially evenly placing, evenly place and be convenient to improve machining precision and raise the efficiency.Every a pair of through hole forms a sense channel.For example: a passage detects for CO, a passage is used for the detection of CO2, a passage is used for the detection of H2S, a passage detects for CH4, a passage is used for the detection of C2H6, and a passage is used for the detection of C3H8, and a passage detects for C4H12, a passage is used for the detection of C5H14, and a passage is used for the detection of O2.Each sense channel of the present invention only needs two sides concave mirror, simplifies Multi-channel optical absorption plant structure, also reduces the manufacturing cost of Multi-channel optical absorption plant.
A through hole of through hole centering of the present invention is for detection of the perforation that enters of light beam, another through hole is for detection of the perforation hole of light beam, every a pair of incident hole, perforation hole and two-face mirror form a sense channel, and the light beam of each sense channel is turned back the envelope cross section of shape for oval.The present invention is simple in structure, a pick-up unit can synchronously carry out detection of gas with multiple constituents, simplified the quantity that the many components of gas detect required absorption detecting device simultaneously, reduced multicomponent gas spectral detection system structure, cost is low, has improved stability and the detection efficiency in optical absorption pond.The present invention is widely used in gas and detects the technical fields such as industry and gas absorption spectroanalysis.
Claims (5)
1. a Multi-channel optical absorption detecting device, the catoptron that includes housing and be mounted thereon, it is characterized in that: two sides concave mirror is coaxially staggered relatively, the reflector curvature radius of two sides concave mirror equates, wherein a concave mirror is provided with multipair through hole, a through hole in every a pair of through hole enters perforation for detecting light beam, another through hole is for detecting light beam perforation hole, an optical absorption passage of the common formation of every a pair of through hole and two sides concave mirror, each channel application is in a kind of detection of specific gas composition, detect the light beam whole Multi-channel optical absorption detecting that forms of repeatedly turning back in two concave mirrors, multipair through hole is along a mirror surface circumferential arrangement wherein, the mid point of every a pair of through hole line of centres all with the center superposition of concave mirror.
2. Multi-channel optical absorption detecting device according to claim 1, it is characterized in that: described two Multi-channel optical absorption detecting devices that concave mirror staggered relatively forms, the ray envelop cross section of turning back that the detection light beam of each optical absorption passage repeatedly turning back between the concave mirror of two sides forms is for oval.
3. Multi-channel optical absorption detecting device according to claim 2, is characterized in that: reflector type or the sphere of described two sides concave mirror, or parabola or ellipsoid.
4. Multi-channel optical absorption detecting device according to claim 3, is characterized in that: in described multipair through hole, the right hole of each through hole is equal or unequal to centre distance.
5. Multi-channel optical absorption detecting device according to claim 4, is characterized in that: described multichannel quantity is preferably selected in 2 passage to 8 passages.
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Cited By (7)
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| CN105548048A (en) * | 2015-12-29 | 2016-05-04 | 山东罗纳德分析仪器有限公司 | Designing method and device of spectrum sampling gas chamber of multi-optical-path single gas chamber |
| CN105739104A (en) * | 2016-05-10 | 2016-07-06 | 力合科技（湖南）股份有限公司 | Multi-beam coupling device and detection air chamber |
| CN109668834A (en) * | 2017-10-16 | 2019-04-23 | 株式会社堀场制作所 | Analytical equipment, multipath reflection pond and analysis method |
| CN109765184A (en) * | 2019-01-16 | 2019-05-17 | 深圳供电局有限公司 | Optical gas absorbance pond and optical gas detection system |
| CN111735784A (en) * | 2020-06-30 | 2020-10-02 | 北京师范大学 | Method for determining formation of linear light spots in multi-gas-reaction chamber, method for determining testing of multiple gases in multi-gas-reaction chamber and multi-gas-reaction chamber |
| CN112534239A (en) * | 2018-08-06 | 2021-03-19 | 英国研究与创新组织 | Optical multipass cell |
| CN114008440A (en) * | 2019-03-04 | 2022-02-01 | 斯维尔系统 | Compact multi-channel gas chamber for multi-gas spectrum sensor |
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| CN105548048A (en) * | 2015-12-29 | 2016-05-04 | 山东罗纳德分析仪器有限公司 | Designing method and device of spectrum sampling gas chamber of multi-optical-path single gas chamber |
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| CN109668834A (en) * | 2017-10-16 | 2019-04-23 | 株式会社堀场制作所 | Analytical equipment, multipath reflection pond and analysis method |
| CN112534239A (en) * | 2018-08-06 | 2021-03-19 | 英国研究与创新组织 | Optical multipass cell |
| CN109765184A (en) * | 2019-01-16 | 2019-05-17 | 深圳供电局有限公司 | Optical gas absorbance pond and optical gas detection system |
| CN109765184B (en) * | 2019-01-16 | 2022-06-07 | 深圳供电局有限公司 | Optical gas absorption cell and optical gas detection system |
| CN114008440A (en) * | 2019-03-04 | 2022-02-01 | 斯维尔系统 | Compact multi-channel gas chamber for multi-gas spectrum sensor |
| CN114008440B (en) * | 2019-03-04 | 2024-02-02 | 斯维尔系统 | Compact multi-channel gas cell for multi-gas spectral sensor |
| CN111735784A (en) * | 2020-06-30 | 2020-10-02 | 北京师范大学 | Method for determining formation of linear light spots in multi-gas-reaction chamber, method for determining testing of multiple gases in multi-gas-reaction chamber and multi-gas-reaction chamber |
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