CN104316159A - Method for achieving quasi-distributed vibration sensing - Google Patents
Method for achieving quasi-distributed vibration sensing Download PDFInfo
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- CN104316159A CN104316159A CN201410611686.8A CN201410611686A CN104316159A CN 104316159 A CN104316159 A CN 104316159A CN 201410611686 A CN201410611686 A CN 201410611686A CN 104316159 A CN104316159 A CN 104316159A
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- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 abstract description 6
- 239000013307 optical fiber Substances 0.000 description 14
- 238000005516 engineering process Methods 0.000 description 11
- 230000035945 sensitivity Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
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- 230000007123 defense Effects 0.000 description 1
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- 239000003822 epoxy resin Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
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Abstract
The invention discloses a method for achieving quasi-distributed vibration sensing. The method is mainly applicable to quasi-distributed vibration sensing. n vibration sensing points are carved on a common single mode fiber with the length L, vibration signals are converted into optical signals through optical pressing materials, two high-speed photoelectric detectors are used for measuring optical signal intensity and the reaching time difference of two signals so as to determine the vibration signal intensity and the vibration position, and therefore quasi-distributed vibration sensing is achieved. No laser light source is adopted in the method, and the method has the advantages of being simple in structure, low in cost and the like.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, particularly a kind of method realizing quasi-distributed vibrating sensing based on optical fiber and press polish material.
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 and developed an indispensable part.Optical fiber not only can as the transmission medium of light wave, also can as the medium of light wave sensing external environment.When light wave transmits in a fiber, its characteristic parameter amplitude, phase place, polarization state, wavelength etc. can connect because of extraneous factor such as temperature, pressure, strain, magnetic field, electric field, displacement equivalence or indirectly change, thus optical fiber can be used as sensing element detection Physics amount.Optical fiber sensing technology is exactly utilize optical fiber to the characteristic of some physical quantity sensitivity, external physical quantity is converted to the technology of the signal that can directly measure.Optical fiber sensing technology is one of of paramount importance sensing technology of optical field, has been widely used in the fields such as petrochemical industry, building, biology, medical science, space flight, aviation, machinery, high ferro, bridge, national defense industry.
Utilize optical fiber sensing technology to realize vibrating sensing, the Fibre Optical Sensor realizing vibrating sensing at present comprises: 1, the Fiber Bragg Grating FBG of enhanced sensitivity.Because Fiber Bragg Grating FBG is insensitive to vibration, need special enhanced sensitivity technology to realize it to the sensing vibrated, complex structure, cost is higher.2, optical fiber FP cavity vibration sensor, is mainly used in single-point vibrating sensing.3, single frequency optical fiber laser.Adopt birefringence doped fiber as dual laser, obtain vibration information with beat signal, sensitivity is higher, but complex structure, cost are higher.Optical fibre vibration sensors all above all needs exploring laser light or pumping laser to be injected into sensor then to obtain vibration signal by detector, all belong to active detection method, there is the shortcoming that cost is higher.Therefore, a kind of method of inventing passive quasi-distributed vibrating sensing with low cost is significant.
Summary of the invention
The present invention is exactly for the deficiencies in the prior art, proposes a kind of method realizing quasi-distributed vibrating sensing based on optical fiber and press polish material.
Method of the present invention comprises the following steps:
Step (1) selects a segment length to be
general single mode fiber 1; Ripe process technology (such as femtosecond laser inscription) is utilized on general single mode fiber, to carve a depression 2, the fibre core of concave bottom general single mode fiber; Press polish material 3 is injected in depression; Coat solidification glue 4 in the place injecting press polish material, thus fix press polish material and strengthen the physical strength of general single mode fiber at recess; Form a vibrating sensing point at the recess of general single mode fiber like this, repeat above-mentioned steps at the diverse location of general single mode fiber, thus to form on whole general single mode fiber n vibrating sensing point 5 altogether.
Step (2) is selected two high speed optoelectronic probes of operation wavelength and press polish match materials and is furnished with a computing machine of high-speed data acquisition card.
The port making the general single mode fiber of n vibrating sensing point is connected with the input port fiber of first high speed optoelectronic probe 6 by step (3); Another port making the general single mode fiber of n vibrating sensing point is connected with the input port fiber of second high speed optoelectronic probe 7; The output port of first high speed optoelectronic probe is connected with computing machine 8 wire being furnished with high-speed data acquisition card; The output port of second high speed optoelectronic probe is connected with the computing machine wire being furnished with high-speed data acquisition card.
When being positioned at general single mode fiber length direction distance origin position
the vibrating sensing point Pi(i=1 at place, 2 ..., when n) receiving vibration signal, the press polish material of its correspondence sends corresponding light signal and is transmitted to two high speed optoelectronic probes, and the time arriving first high speed optoelectronic probe is
(1)
The time arriving two high speed optoelectronic probes is
(2)
Its mistiming is
(3)
Wherein,
for the effective refractive index of general single mode fiber,
for vacuum light speed.
When computing machine obtains time-domain signal by two high speed optoelectronic probes, determining vibration position according to formula (3) by calculating the time-domain signal mistiming, determining that vibration signal is strong and weak by time-domain signal power.Therefore, quasi-distributed vibrating sensing is completed.
The present invention is mainly applicable to quasi-distributed vibrating sensing, in length is
general single mode fiber on scribe and made n vibrating sensing point, make use of press polish material and vibration signal is converted into light signal, determine vibration signal power and vibration position by two high speed optoelectronic probe measurement light signals powers and two signal arrival time differences, thus achieve quasi-distributed vibrating sensing.The present invention does not adopt any LASER Light Source, has the advantages such as structure is simple, with low cost.
Accompanying drawing explanation
Fig. 1 a is the structural representation of general single mode fiber;
Fig. 1 b is the structural representation of the general single mode fiber after pit;
Fig. 1 c is the structural representation of the general single mode fiber after injecting press polish material;
Fig. 1 d is structural representation of the present invention;
Fig. 2 is the time-domain signal that in the embodiment of the present invention, two high-speed photodetectors receive.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
The device realizing quasi-distributed vibrating sensing comprises a segment length and is
the general single mode fiber of (2000 meters), first high-speed photodetector, second high-speed photodetector and one are furnished with the computing machine of high-speed data acquisition card.
The method of the quasi-distributed vibrating sensing of specific implementation comprises the following steps:
(1) segment length is selected to be
the general single mode fiber of (2000 meters), as Fig. 1 a; Utilize ripe femtosecond laser to inscribe process technology on general single mode fiber 1, carve a depression 2, the fibre core of concave bottom general single mode fiber, as Fig. 1 b; Press polish material 3(PMN-PT lead magnesio-niobate crystal and epoxy resin powder powder composite material is injected) in depression; Coat solidification glue 4 in the place injecting press polish material, thus fix press polish material and strengthen the physical strength of general single mode fiber at recess, as Fig. 1 c; Form a vibrating sensing point at the recess of general single mode fiber like this, repeat above-mentioned steps in the position at 1 meter, the interval of general single mode fiber, thus to form on whole general single mode fiber 2000 vibrating sensing points 5 altogether.
(2) select two high speed optoelectronic probes of operation wavelength and press polish match materials and be furnished with a computing machine of high-speed data acquisition card;
(3) port making the general single mode fiber of 2000 vibrating sensing points is connected with the input port fiber of first high speed optoelectronic probe 6; Another port making the general single mode fiber of 2000 vibrating sensing points is connected with the input port fiber of second high speed optoelectronic probe 7; The output port of first high speed optoelectronic probe is connected with computing machine 8 wire being furnished with high-speed data acquisition card; The output port of second high speed optoelectronic probe is connected with the computing machine wire being furnished with high-speed data acquisition card, as Fig. 1 d.
Fig. 2 gives the time-domain signal that two high speed viewpoint detectors receive, and two vibration signal mistimings are 1.45 microseconds, considers that general single mode fiber effective refractive index is
, can determine that vibration position is according to formula (3)
rice, its Relative Vibration intensity is 0.6.
The present invention mainly make use of the Distributed Optical Fiber Sensing Techniques that development in recent years is got up, and in length is
general single mode fiber on scribe and made n vibrating sensing point, make use of press polish material and vibration signal is converted into light signal, determine vibration signal power and vibration position by two high speed optoelectronic probe measurement light signals powers and two signal arrival time differences, thus achieve quasi-distributed vibrating sensing.The present invention does not adopt any LASER Light Source, has the advantages such as structure is simple, with low cost.
Claims (1)
1. realize a method for quasi-distributed vibrating sensing, it is characterized in that the method comprises the steps:
Step (1) selects a segment length to be
general single mode fiber; General single mode fiber carves a depression, and concave bottom is the fibre core of general single mode fiber; Press polish material is injected in depression; Coat solidification glue in the place injecting press polish material, thus fix press polish material and strengthen the physical strength of general single mode fiber at recess; Form a vibrating sensing point at the recess of general single mode fiber like this, repeat above-mentioned steps at the diverse location of general single mode fiber, thus to form on whole general single mode fiber n vibrating sensing point altogether;
Step (2) is selected two high speed optoelectronic probes of operation wavelength and press polish match materials and is furnished with a computing machine of high-speed data acquisition card;
The port making the general single mode fiber of n vibrating sensing point is connected with the input port fiber that first high speed optoelectronic is popped one's head in by step (3); Another port making the general single mode fiber of n vibrating sensing point is connected with the input port fiber that second high speed optoelectronic is popped one's head in; The output port of first high speed optoelectronic probe is connected with the computing machine wire being furnished with high-speed data acquisition card; The output port of second high speed optoelectronic probe is connected with the computing machine wire being furnished with high-speed data acquisition card;
When being positioned at general single mode fiber length direction distance origin position
when the vibrating sensing point Pi at place receives vibration signal, the press polish material of its correspondence sends corresponding light signal and is transmitted to two high speed optoelectronic probes, and the time arriving first high speed optoelectronic probe is
(1)
The time arriving two high speed optoelectronic probes is
(2)
Its mistiming is
(3)
Wherein,
for the effective refractive index of general single mode fiber,
for vacuum light speed;
When computing machine obtains time-domain signal by two high speed optoelectronic probes, determining vibration position according to formula (3) by calculating the time-domain signal mistiming, determining that vibration signal is strong and weak by time-domain signal power; Therefore, quasi-distributed vibrating sensing is completed.
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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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106813766A (en) * | 2017-01-23 | 2017-06-09 | 中国科学院半导体研究所 | Sound magnetic is with 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 |
|---|
| AXEL BERTHOLDS等: "Determination of the Individual Strain-Optic Coefficients in Single-Mode Optical Fibers", 《JOURNAL OF LIGHTWAVE TECHNOLOGY》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106813766A (en) * | 2017-01-23 | 2017-06-09 | 中国科学院半导体研究所 | Sound magnetic is with the distributed optical fiber sensing system surveyed |
| 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 |
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| CN104316159B (en) | 2017-03-29 |
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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 |
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