CN104316159B - A kind of method for realizing quasi-distributed vibrating sensing - Google Patents
A kind of method for realizing quasi-distributed vibrating sensing Download PDFInfo
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- CN104316159B CN104316159B CN201410611686.8A CN201410611686A CN104316159B CN 104316159 B CN104316159 B CN 104316159B CN 201410611686 A CN201410611686 A CN 201410611686A CN 104316159 B CN104316159 B CN 104316159B
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- single mode
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- mode fiber
- vibrating sensing
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000000835 fiber Substances 0.000 claims abstract description 50
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- 230000005693 optoelectronics Effects 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 20
- 230000003287 optical effect Effects 0.000 claims abstract description 10
- 239000013307 optical fiber Substances 0.000 claims description 15
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 239000003292 glue Substances 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 11
- 239000000843 powder Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
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- 238000001514 detection method Methods 0.000 description 1
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- 239000003822 epoxy resin Substances 0.000 description 1
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- 238000005086 pumping Methods 0.000 description 1
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Abstract
The invention discloses a kind of method for realizing quasi-distributed vibrating sensing.The present invention is mainly suitable for quasi-distributed vibrating sensing, scribe on the general single mode fiber that length is and made n vibrating sensing point, make use of press polish material that vibration signal is converted into optical signal, vibration signal power and vibration position are determined by two high speed optoelectronic probe measurement optical signals powers and two signal arrival time differences, it is achieved thereby that quasi-distributed vibrating sensing.The present invention adopts any LASER Light Source, has the advantages that simple structure, with low cost.
Description
Technical field
It is the invention belongs to technical field of optical fiber sensing, more particularly to a kind of to be based on optical fiber and press polish material realizes quasi- distribution
The method of formula vibrating sensing.
Background technology
The appearance of optical fiber is a milestone of field of sensing technologies, and Fibre Optical Sensor has become technology of Internet of things to be developed
An indispensable part.Optical fiber acts not only as the transmission medium of light wave, it is also possible to used as light wave sensing external environment
Medium.When light wave is transmitted in a fiber, its characteristic parameter amplitude, phase place, polarization state, wavelength etc. can be because of extraneous factors such as temperature
Degree, pressure, strain, magnetic field, electric field, displacement equivalence connect or change indirectly, so as to visit optical fiber as sensing element
Survey physical quantity.Optical fiber sensing technology is exactly that being converted into external physical quantity can using the optical fiber characteristic sensitive to some physical quantitys
With the technology of signal measured directly.Optical fiber sensing technology is one of of paramount importance sensing technology of optical field, wide
It is general to be applied to the fields such as petrochemical industry, building, biology, medical science, space flight, aviation, machinery, high ferro, bridge, national defense industry.
Vibrating sensing can be realized using optical fiber sensing technology, realize that the Fibre Optical Sensor of vibrating sensing includes at present：1、
The Fiber Bragg Grating FBG of enhanced sensitivity.As Fiber Bragg Grating FBG is insensitive to vibrating, need special enhanced sensitivity technology to realize
Its sensing to vibration, complex structure are relatively costly.2nd, optical fiber FP cavity vibration sensors, are mainly used in single-point vibrating sensing.3、
Single frequency optical fiber laser.Using birefringence doped fiber as dual laser, vibration information is obtained with beat signal, it is sensitive
Degree is higher, but complex structure, relatively costly.Above all of optical fibre vibration sensor is required for exploring laser light or pumping laser
It is injected into sensor and then vibration signal is obtained by detector, belongs to active detection method, have the shortcomings that relatively costly.
Therefore, invent a kind of method of passive quasi-distributed vibrating sensing with low cost significant.
The content of the invention
The present invention is aiming at the deficiencies in the prior art, it is proposed that one kind is realized quasi-distributed based on optical fiber and press polish material
The method of vibrating sensing.
The method of the present invention is comprised the following steps：
Step (1) select a segment length beGeneral single mode fiber 1；Using ripe process technology（Such as femtosecond swashs
Light is inscribed）A depression 2, the fibre core of concave bottom general single mode fiber are carved on general single mode fiber；Inject in depression
Press polish material 3；Solidification glue 4 is coated where injection press polish material, so as to fixing press polish material and strengthening general single mode fiber
In the mechanical strength of recess；Recess so in general single mode fiber forms a vibrating sensing point, in general single mode light
Fine diverse location repeat the above steps, so as to form on whole general single mode fiber n vibrating sensing point 5 altogether.
Step (2) selects two high speed optoelectronic probes of operation wavelength and press polish match materials and is furnished with high-speed data acquisition
One computer of card.
Step (3) will make a port and first high-speed light of the general single mode fiber of n vibrating sensing point
The input port fiber connection of electric probe 6；By made the general single mode fiber of n vibrating sensing point another port and
The input port fiber connection of second high speed optoelectronic probe 7；By the output port of first high speed optoelectronic probe and it is furnished with height
8 wire of the computer connection of fast data collecting card；By the output port of second high speed optoelectronic probe and it is furnished with high-speed data and adopts
The computer wire connection of truck.
When positioned at general single mode fiber length direction apart from origin positionThe vibrating sensing point Pi at place（I=1,2 ... ...,
n）When receiving vibration signal, its corresponding press polish material sends corresponding optical signal and is transmitted to two high speed optoelectronics probe, reaches the
The time of one high speed optoelectronic probe is
(1)
The time for reaching two high speed optoelectronics probe is
(2)
Its time difference is
(3)
Wherein,For the effective refractive index of general single mode fiber,For vacuum light speed.
When computer obtains time-domain signal by two high speed optoelectronic probes, according to formula（3）By calculating time domain letter
Number time difference determines that by time-domain signal power vibration signal is strong and weak determining vibration position.Therefore, complete quasi-distributed
Vibrating sensing.
The present invention is mainly suitable for quasi-distributed vibrating sensing, in length isGeneral single mode fiber on scribe and made n
Individual vibrating sensing point, make use of press polish material that vibration signal is converted into optical signal, by two high speed optoelectronic probe measurement light
Signal strength and two signal arrival time differences determining that vibration signal is strong and weak and vibration position, it is achieved thereby that quasi-distributed
Vibrating sensing.The present invention adopts any LASER Light Source, has the advantages that simple structure, with low cost.
Description of the drawings
Structural representations of Fig. 1 a for general single mode fiber；
Structural representations of Fig. 1 b for the general single mode fiber after pit；
Fig. 1 c are the structural representation of the general single mode fiber after injecting press polish material；
Fig. 1 d are the structural representation of the present invention；
The time-domain signal that Fig. 2 is received for two high-speed photodetectors in the embodiment of the present invention.
Specific embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Realize that the device of quasi-distributed vibrating sensing includes that a segment length is（2000 meters）General single mode fiber, first
Individual high-speed photodetector, second high-speed photodetector and a computer for being furnished with high-speed data acquisition card.
The method for implementing quasi-distributed vibrating sensing is comprised the following steps：
(1) one segment length of selection is（2000 meters）General single mode fiber, such as Fig. 1 a；Carved using ripe femtosecond laser
Write process technology and a depression 2, the such as fibre core of concave bottom general single mode fiber, Fig. 1 b are carved on general single mode fiber 1；
Injection press polish material 3 in depression（PMN-PT lead magnesio-niobates crystal and epoxy resin powder powder composite material）；In injection press polish material
Where coat solidification glue 4, so as to fixed press polish material and strengthen mechanical strength of the general single mode fiber in recess, such as scheme
1c；Recess so in general single mode fiber forms a vibrating sensing point, in 1 meter of the position in the interval of general single mode fiber
Repeat the above steps, so as to form on whole general single mode fiber 2000 vibrating sensing points 5 altogether.
(2) two high speed optoelectronic probes of operation wavelength and press polish match materials are selected and is furnished with high-speed data acquisition card
One computer；
(3) a port and first high speed optoelectronic of the general single mode fiber of 2000 vibrating sensing points will have been made
The input port fiber connection of probe 6；Another port of the general single mode fiber of 2000 vibrating sensing points will be made
With the input port fiber connection of second high speed optoelectronic probe 7；By the output port of first high speed optoelectronic probe and it is furnished with
8 wire of the computer connection of high-speed data acquisition card；By the output port of second high speed optoelectronic probe and it is furnished with high-speed data
The computer wire connection of capture card, such as Fig. 1 d.
Fig. 2 gives the time-domain signal that two high speed viewpoint detectors are received, and two vibration signal time differences are 1.45
Microsecond, it is contemplated that general single mode fiber effective refractive index is, according to formula（3）Can determine that vibration position is
Rice, its Relative Vibration intensity are 0.6.
The present invention mainly make use of Distributed Optical Fiber Sensing Techniques developed in recent years, in length beCommon list
Scribe on mode fiber and made n vibrating sensing point, make use of press polish material that vibration signal is converted into optical signal, it is high by two
Fast photoelectric probe measures optical signal power and two signal arrival time differences to determine vibration signal power and vibration position, from
And realize quasi-distributed vibrating sensing.The present invention does not adopt any LASER Light Source, excellent with simple structure, with low cost etc.
Point.
Claims (1)
1. a kind of method for realizing quasi-distributed vibrating sensing, it is characterised in that the method comprises the steps：
Step (1) selects a segment length for the general single mode fiber of L；A depression is carved on general single mode fiber, be recessed bottom
Fibre core of the portion for general single mode fiber；Press polish material is injected in depression；Solidification glue is coated where injection press polish material, from
And fix press polish material and strengthen mechanical strength of the general single mode fiber in recess；So in the recess of general single mode fiber
A vibrating sensing point is formed, in the diverse location repeat the above steps of general single mode fiber, so as to form whole general single mode
N vibrating sensing point altogether on optical fiber；
Step (2) selects two high speed optoelectronic probes of operation wavelength and press polish match materials and is furnished with high-speed data acquisition card
One computer；
Step (3) will make a port and first high-speed light electrical resistivity survey of the general single mode fiber of n vibrating sensing point
The input port fiber connection of head；Another port and second of the general single mode fiber of n vibrating sensing point will be made
The input port fiber connection of individual high speed optoelectronic probe；By the output port of first high speed optoelectronic probe and it is furnished with high-speed data
The computer wire connection of capture card；By the output port of second high speed optoelectronic probe and the meter for being furnished with high-speed data acquisition card
Calculation machine wire connects；
When vibration signal is received positioned at vibrating sensing point Pi of the general single mode fiber length direction at origin position X, its
Corresponding press polish material sends corresponding optical signal and is transmitted to two high speed optoelectronics probe, reach first high speed optoelectronic probe when
Between be
t1=Xneff/c (1)
The time for reaching second high speed optoelectronic probe is
t2=(L-X) neff/c (2)
Its time difference is
△ t=(t1-t2)=(2X-L) neff/c (3)
Wherein, neffFor the effective refractive index of general single mode fiber, c is vacuum light speed；
When computer obtains time-domain signal by two high speed optoelectronic probes, according to formula (3) by calculating during time-domain signal
Between differ from determining vibration position, determine that by time-domain signal power vibration signal is strong and weak；Therefore, complete quasi-distributed vibration
Sensing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410611686.8A CN104316159B (en) | 2014-11-03 | 2014-11-03 | A kind of method for realizing quasi-distributed vibrating sensing |
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| CN201410611686.8A CN104316159B (en) | 2014-11-03 | 2014-11-03 | A kind of method for realizing quasi-distributed vibrating sensing |
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| Publication Number | Publication Date |
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| CN104316159A CN104316159A (en) | 2015-01-28 |
| CN104316159B true CN104316159B (en) | 2017-03-29 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106813766B (en) * | 2017-01-23 | 2019-09-24 | 中国科学院半导体研究所 | Sound magnetic is the same as the distributed optical fiber sensing system surveyed |
| CN107063434A (en) * | 2017-05-24 | 2017-08-18 | 苏州至禅光纤传感技术有限公司 | A kind of distributed vibration sensing method based on special optical fiber |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5627637A (en) * | 1995-02-24 | 1997-05-06 | Kapteyn; Kelvin L. | Fully distributed optical fiber strain sensor |
| US7030366B2 (en) * | 2004-05-13 | 2006-04-18 | General Electric Company | Micro piezo-optic composite transducers and fabrication methods |
| CN103033842A (en) * | 2012-12-18 | 2013-04-10 | 电子科技大学 | Time division multiplexing array type fiber bragg grating seismic wave real-time monitoring system |
| CN103208161A (en) * | 2013-03-19 | 2013-07-17 | 石家庄供电公司 | Active detecting type fiber grating cable tunnel security and protection monitoring system |
-
2014
- 2014-11-03 CN CN201410611686.8A patent/CN104316159B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5627637A (en) * | 1995-02-24 | 1997-05-06 | Kapteyn; Kelvin L. | Fully distributed optical fiber strain sensor |
| US7030366B2 (en) * | 2004-05-13 | 2006-04-18 | General Electric Company | Micro piezo-optic composite transducers and fabrication methods |
| CN103033842A (en) * | 2012-12-18 | 2013-04-10 | 电子科技大学 | Time division multiplexing array type fiber bragg grating seismic wave real-time monitoring system |
| CN103208161A (en) * | 2013-03-19 | 2013-07-17 | 石家庄供电公司 | Active detecting type fiber grating cable tunnel security and protection monitoring system |
Non-Patent Citations (1)
| Title |
|---|
| Determination of the Individual Strain-Optic Coefficients in Single-Mode Optical Fibers;AXEL BERTHOLDS等;《JOURNAL OF LIGHTWAVE TECHNOLOGY》;19880131;第6卷(第1期);第17-20页 * |
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Effective date of registration: 20231201 Address after: 311106 Room 102, building 1, No. 1, nangonghe Road, Yuhang District, Hangzhou City, Zhejiang Province Patentee after: HANGZHOU BACOU MACHINERY MANUFACTURING Co.,Ltd. Address before: 321019 No. 688 Yingbin Road, Zhejiang, Jinhua Patentee before: ZHEJIANG NORMAL University |