CN103994785A - Sensing monitoring device and method based on weak fiber bragg grating array - Google Patents
Sensing monitoring device and method based on weak fiber bragg grating array Download PDFInfo
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- CN103994785A CN103994785A CN201410232267.3A CN201410232267A CN103994785A CN 103994785 A CN103994785 A CN 103994785A CN 201410232267 A CN201410232267 A CN 201410232267A CN 103994785 A CN103994785 A CN 103994785A
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- bragg grating
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Abstract
The invention provides a sensing monitoring device and method based on a weak fiber bragg grating array in order to solve the problems of large crosstalk noise between fiber bragg grating sensors, complex network structure and high system manufacturing cost of the existing fiber bragg grating sensing network technology. By controlling a pulse width of an input optical pulse, time duration of the optical pulse is larger than that of light reflection between two adjacent gratings in the weak fiber bragg grating array, forwardly-transmitted light interferes with reflected light between the two adjacent fiber bragg gratings, the system inquires an interference signal accurately to complete addressing and monitoring on the weak fiber bragg grating array, therefore, a signal to noise ratio between the fiber bragg grating sensors is increased, the sensing network structure is simplified, and cost is reduced.
Description
Technical field
The invention belongs to fields of sensing technique monitoring, be specifically related to a kind of grating sensing monitoring device and method based on weak optical fiber Bragg grating array.
Background technology
Fibre Optical Sensor has light, high temperature resistant, corrosion-resistant, the anti-electromagnetic interference (EMI) of quality, the on-the-spot advantage such as passive, can be operated in the environment that the common people such as High Temperature High Pressure, fire cannot arrive, and has more wide application prospect than traditional electrical sensor.
The method that the matched fiber grating using in optical fiber grating sensing monitoring technology at present and sensing grating are relatively demarcated, this method is subject to mating the restriction of technique difference in grating and the actual manufacture of sensing grating, crosstalk noise between fiber-optic grating sensor is larger, in addition, sensing network complexity, system cost costliness.Simultaneously other are by the low light level grid method into the net of connecting, and network size is subject to the restriction of optical grating reflection rate, but low light level grid reflectivity can cause again transducing signal not strong a little less than crossing, the wavelength detection and demodulation of signal is caused to great difficulty.In sum, the crosstalk noise between the fiber-optic grating sensor existing in existing fiber grating sensing network technology is large, the shortcoming of the complicated network structure, system cost costliness, has limited the development of sensing network scale.
Summary of the invention
In order to solve, crosstalk noise between the fiber-optic grating sensor existing in existing fiber grating sensing network technology is large, the shortcoming of the complicated network structure, system cost costliness, the invention provides a kind of grating sensing monitoring device based on weak optical fiber Bragg grating array, realize and improve signal to noise ratio (S/N ratio) between fiber-optic grating sensor, simplify sensing network structure, the object reducing costs.
In order to reach foregoing invention object, the present invention takes following technical scheme:
A kind of grating sensing monitoring device based on weak optical fiber Bragg grating array is provided, comprises,
Light source module, for coherent pulse light is provided, its pulse width is longer than in weak optical fiber Bragg grating array and is reflected required time between adjacent two fiber gratings; Weak optical fiber Bragg grating array, receives the coherent pulse light that light source module sends, and between the reflected light in weak optical fiber Bragg grating array between adjacent two fiber gratings, interferes; Photodetector, is placed in the output terminal of weak optical fiber Bragg grating array, surveys this interference signal and is sent to controller; Controller, is connected with photodetector, for gathering this interference signal, and the fiber-optic grating sensor part that produces this interference signal is inquired about.
Described weak optical fiber Bragg grating array is Fiber Bragg Grating FBG array.
Described light source module comprises the light source that sends coherent laser, and the photoswitch arranging after described light source, sends electric clock signal by the pulse producer in described controller, and pulse producer is connected with photoswitch, and photoswitch is controlled.Described light source is single wavelength coherent laser light source or multi-wavelength coherent laser light source.
For coherent pulse light is amplified, between described photoswitch and described weak optical fiber Bragg grating array, image intensifer is set, amplify entering weak optical fiber Bragg grating array coherent pulse light before.
Between described image intensifer and weak optical fiber Bragg grating array, be also provided with 3 port photocirculators, the output terminal of described image intensifer connects 1 port of optical circulator, 2 ports of optical circulator connect weak optical fiber Bragg grating array, and 3 ports of optical circulator connect described photodetector.
Between described photodetector output terminal and the input end of described controller, be also provided with low-pass filter, the output terminal of photodetector is connected with the input end of low-pass filter, and the output terminal of low-pass filter is connected with the input end of controller.
In controller, be also provided with digital-to-analogue capture card, electric signal is gathered.
The grating sensing monitoring device principle that the present invention is based on weak optical fiber Bragg grating array is: coherent source is modulated to coherent pulse light after photoswitch, and the electric clock signal that photoswitch is sent by pulse producer is controlled, and controller is controlled described in consists.Coherent pulse after photoswitch is amplified by image intensifer, then enter 1 port of optical circulator, the light signal entering from 1 port, 2 ports by optical circulator are exported, input weak optical fiber Bragg grating array, light signal carries out after reflected light interference between each adjacent 2 fiber gratings in weak optical fiber Bragg grating array, interference signal is from 3 port outputs of optical circulator, enter photodetector, light signal is converted to electric signal, the output terminal of photodetector connects the input end of low-pass filter, be low pass filtering after device filtering, signal enters controller, described signal is gathered by the digital-to-analogue capture card in controller, and process, the fiber-optic grating sensor part that produces this interference signal is inquired about, be specially the interference signal by gathering different time, optical fiber optical grating array senser element is carried out to the inquiry of address lookup and optical wavelength information.
The present invention also provides a kind of sensor monitoring method based on weak optical fiber Bragg grating array, comprising:
The pulse width that incides the coherent pulse light in weak optical fiber Bragg grating array is controlled, made this pulse width be longer than light and reflect required time between adjacent two fiber gratings; Between the reflected light of adjacent two fiber gratings, interfere, this interference signal is sent to controller by photodetector; Controller gathers this interference signal, and the fiber-optic grating sensor part that produces this interference signal is inquired about.
As inquired about with i+1 fiber grating interference signal i, need acquisition time to be
catoptrical interference signal, wherein Δ L
iit is the spacing between i grating and i+1 grating.This interference signal has comprised former and later two adjacent fiber optical grating reflection interference of light signals, the variation of environmental parameter that can the perception of analyte sensors institute by follow-up data processing.
Wherein modulate through photoswitch the coherent pulse light obtaining, the pulse width of i light pulse should be: t
i>=2 Δ L
in
eff/ c, wherein in weak optical fiber Bragg grating array, the spacing of i grating and i+1 adjacent gratings is Δ L
i, n
efffor the effective refractive index of optical fiber, c is the light velocity in vacuum.
Described fiber-optic grating sensor part is inquired about specifically and comprised, by gathering the interference signal of different time, optical fiber optical grating array senser element is carried out to the inquiry of address lookup and optical wavelength information.
Beneficial effect of the present invention is: realize and improve signal to noise ratio (S/N ratio) between fiber-optic grating sensor, simplify sensing network structure, the object reducing costs.
Brief description of the drawings
Fig. 1 is the structural representation of apparatus of the present invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with accompanying drawing, specific embodiments of the invention are described in further detail:
As shown in drawings, a kind of grating sensing monitoring device based on weak optical fiber Bragg grating array provided by the invention, comprises, light source module, and for coherent pulse light is provided, its pulse width is longer than in weak optical fiber Bragg grating array and is reflected required time between adjacent two fiber gratings; Weak optical fiber Bragg grating array, receives the coherent pulse light that light source module sends, and between the reflected light in weak optical fiber Bragg grating array between adjacent two fiber gratings, interferes; Photodetector, is placed in the output terminal of weak optical fiber Bragg grating array, surveys this interference signal and is sent to controller; Controller, is connected with photodetector, for gathering this interference signal, and the fiber-optic grating sensor part that produces this interference signal is inquired about.
Described weak optical fiber Bragg grating array is Fiber Bragg Grating FBG array.In the embodiment of the present invention, low light level grid array is made up of multiple Fiber Bragg Gratings with utmost point antiradar reflectivity, and wherein the reflectivity of grating is in 0.1～1 ‰ magnitude, and wavelength coverage is in the wavelength coverage of light source.
Described light source module comprises the light source that sends coherent laser, and the photoswitch arranging after described light source, sends electric clock signal by the pulse producer in described controller, and pulse producer is connected with photoswitch, and photoswitch is controlled.Described light source is single wavelength coherent laser light source or multi-wavelength coherent laser light source.In the embodiment of the present invention, light source uses relevant comb-type light source.
In the embodiment of the present invention, photoswitch adopts SOA photoswitch.Can also use the photoswitch based on AOM or the photoswitch based on EAM or EOM photoswitch.Photoswitch is under control of the controller, and the time span of control inputs light pulse makes the duration of light pulse be greater than the length of the reflection between adjacent two gratings, and the reflected signal of adjacent two gratings forms and interferes.
For coherent pulse light is amplified, between described photoswitch and described weak optical fiber Bragg grating array, image intensifer is set, amplify entering weak optical fiber Bragg grating array coherent pulse light before.
In the embodiment of the present invention, image intensifer uses Erbium-Doped Fiber Amplifier (EDFA).Or according to the needs of operation wavelength, also can adopt PDFA Praseodymium Doped Fiber Amplifier, or realize by semiconductor optical amplifier.
Between described image intensifer and weak optical fiber Bragg grating array, be also provided with 3 port photocirculators, the output terminal of described image intensifer connects 1 port of optical circulator, 2 ports of optical circulator connect weak optical fiber Bragg grating array, and 3 ports of optical circulator connect described photodetector.
Between described photodetector output terminal and the input end of described controller, be also provided with low-pass filter, the output terminal of photodetector is connected with the input end of low-pass filter, and the output terminal of low-pass filter is connected with the input end of controller.
In controller, be also provided with digital-to-analogue capture card, the electric signal of photodetector output is gathered.
The present invention also provides a kind of sensor monitoring method based on weak optical fiber Bragg grating array, comprising:
The pulse width that incides the coherent pulse light in weak optical fiber Bragg grating array is controlled, made this pulse width be longer than light and reflect required time between adjacent two fiber gratings; Between reflected light between adjacent two fiber gratings, interfere, this interference signal is sent to controller by photodetector; Controller gathers this interference signal, and the fiber-optic grating sensor part that produces this interference signal is inquired about.
In the embodiment of the present invention, low light level grid array is made up of multiple Fiber Bragg Gratings with utmost point antiradar reflectivity, light source module comprises the relevant comb-type light source that sends continuous coherent light, and the photoswitch arranging after described light source, send electric clock signal by the pulse producer in described controller, photoswitch is controlled, and photoswitch adopts SOA photoswitch.Photoswitch is under control of the controller, and the time span of control inputs light pulse makes the duration of light pulse be greater than the length of the reflection between adjacent two gratings of light, and the reflected signal of adjacent two gratings forms and interferes.Between photoswitch and described weak optical fiber Bragg grating array, Erbium-Doped Fiber Amplifier (EDFA) is set, between image intensifer and weak optical fiber Bragg grating array, be also provided with 3 ports light rings, described image intensifer connects No. 1 port of optical circulator, No. 2 ports of optical circulator connect weak optical fiber Bragg grating array, and 3 ports of optical circulator connect described photodetector.Between photodetector output terminal and the input end of described control module, be also provided with low-pass filter.Signal lower than set frequency is filtered.In controller, be provided with digital-to-analogue capture card, the electric signal of photodetector output is gathered.
Wherein modulate through photoswitch the coherent pulse light obtaining, the pulse width of i light pulse should be: t
i>=2 Δ L
in
eff/ c, wherein the spacing of the every adjacent gratings of weak optical fiber Bragg grating array is Δ L
i, n
efffor the effective refractive index of optical fiber, c is the light velocity in vacuum.
Described fiber-optic grating sensor part is inquired about specifically and comprised, by gathering the interference signal of different time, optical fiber optical grating array senser element is carried out to the inquiry of address lookup and optical wavelength information.
The invention provides a kind of grating sensing monitoring device and method based on weak optical fiber Bragg grating array, by the pulse width of control inputs light pulse, make the duration of light pulse be greater than the time span that in weak optical fiber Bragg grating array, between adjacent two gratings, light reflects, between fl transmission light between adjacent two fiber gratings and reflected light, interfere, system is inquired about accurately to interference signal, complete addressing and monitoring to weak optical fiber Bragg grating array, and then realize signal to noise ratio (S/N ratio) between raising fiber-optic grating sensor, simplify sensing network structure, the object reducing costs.
Claims (10)
1. the grating sensing monitoring device based on weak optical fiber Bragg grating array, is characterized in that, comprising:
Light source module, for coherent pulse light is provided, its pulse width is longer than in weak optical fiber Bragg grating array and is reflected required time between adjacent two fiber gratings;
Weak optical fiber Bragg grating array, receives the coherent pulse light that light source module sends, and between the reflected light in weak optical fiber Bragg grating array between adjacent two fiber gratings, interferes;
Photodetector, is placed in the output terminal of weak optical fiber Bragg grating array, surveys this interference signal and is sent to controller; Controller, is connected with photodetector, for gathering this interference signal, and the fiber-optic grating sensor part that produces this interference signal is inquired about.
2. the grating sensing monitoring device based on weak optical fiber Bragg grating array according to claim 1, its spy is, described weak optical fiber Bragg grating array is Fiber Bragg Grating FBG array.
3. the grating sensing monitoring device based on weak optical fiber Bragg grating array according to claim 1, it is characterized in that, described light source module comprises the light source that sends coherent laser, and the photoswitch arranging after described light source, send electric clock signal by the pulse producer in described controller, pulse producer is connected with photoswitch, and photoswitch is controlled.
4. the grating sensing monitoring device based on weak optical fiber Bragg grating array according to claim 3, is characterized in that, described light source is single wavelength coherent laser light source or multi-wavelength coherent laser light source.
5. the grating sensing monitoring device based on weak optical fiber Bragg grating array according to claim 4, it is characterized in that, also comprise image intensifer, be arranged between described photoswitch and described weak optical fiber Bragg grating array, amplify entering weak optical fiber Bragg grating array coherent pulse light before.
6. the grating sensing monitoring device based on weak optical fiber Bragg grating array according to claim 5, it is characterized in that, between described image intensifer and weak optical fiber Bragg grating array, be also provided with 3 port photocirculators, the output terminal of described image intensifer connects 1 port of optical circulator, 2 ports of optical circulator connect weak optical fiber Bragg grating array, and 3 ports of optical circulator connect described photodetector.
7. the grating sensing monitoring device based on weak optical fiber Bragg grating array according to claim 1, it is characterized in that, between described photodetector output terminal and the input end of described controller, be also provided with low-pass filter, the output terminal of photodetector is connected with the input end of low-pass filter, and the output terminal of low-pass filter is connected with the input end of controller.
8. the sensor monitoring method based on weak optical fiber Bragg grating array, is characterized in that, comprising:
The pulse width that incides the coherent pulse light in weak optical fiber Bragg grating array is controlled, made this pulse width be longer than light and reflect required time between arbitrary adjacent two fiber gratings;
Between reflected light between adjacent two fiber gratings, interfere, this interference signal is sent to controller by photodetector;
Controller gathers this interference signal, and the fiber-optic grating sensor part that produces this interference signal is inquired about.
9. the sensor monitoring method based on weak optical fiber Bragg grating array according to claim 8, is characterized in that, modulates through photoswitch the coherent pulse light obtaining, and the pulse width of i light pulse should be: t
i>=2 Δ L
in
eff/ c, wherein in weak optical fiber Bragg grating array, the spacing of i grating and i+1 grating is Δ L
i, n
efffor the effective refractive index of optical fiber, c is the light velocity in vacuum.
10. the sensor monitoring method based on weak optical fiber Bragg grating array according to claim 9, it is characterized in that, described fiber-optic grating sensor part is inquired about specifically and comprised, by gathering the interference signal of different time, optical fiber optical grating array senser element is carried out to the inquiry of address lookup and optical wavelength information.
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