CN108168687A - A kind of polarization interference formula defence area type all -fiber vibrating sensor - Google Patents
A kind of polarization interference formula defence area type all -fiber vibrating sensor Download PDFInfo
- Publication number
- CN108168687A CN108168687A CN201810232256.3A CN201810232256A CN108168687A CN 108168687 A CN108168687 A CN 108168687A CN 201810232256 A CN201810232256 A CN 201810232256A CN 108168687 A CN108168687 A CN 108168687A
- Authority
- CN
- China
- Prior art keywords
- fiber
- optical
- area type
- defence area
- polarization interference
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000835 fiber Substances 0.000 title claims abstract description 94
- 230000010287 polarization Effects 0.000 title claims abstract description 29
- 230000003287 optical effect Effects 0.000 claims abstract description 55
- 230000005540 biological transmission Effects 0.000 claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 21
- 238000012545 processing Methods 0.000 claims abstract description 21
- 239000000523 sample Substances 0.000 claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 claims abstract description 4
- 230000005693 optoelectronics Effects 0.000 claims abstract description 4
- 239000013307 optical fiber Substances 0.000 claims description 40
- 230000008033 biological extinction Effects 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 abstract description 8
- 238000012544 monitoring process Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 206010034960 Photophobia Diseases 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011990 functional testing Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 208000013469 light sensitivity Diseases 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
Abstract
The invention discloses a kind of polarization interference formula defence area type all -fiber vibrating sensors.It includes light source, optical branching device, signal processing unit and n sense channel；The optical signal that light source is sent out is divided into n+1 roads by optical branching device, refers to signal input signal processing unit wherein being used as after opto-electronic conversion all the way, in addition n roads input n sense channel as detection light respectively；Every sense channel includes optical circulator, photodetector, Transmission Fibers, the polarizer, all -fiber vibrating sensing probe, distinguish the input terminal of connecting detection light, one end of Transmission Fibers, photodetector in a, b, c port of optical circulator, the other end of Transmission Fibers is connected via the polarizer and all -fiber vibrating sensing probe, the output terminal connection signal processing unit of photodetector；Signal processing unit is used to that signal to be handled to obtain vibration information.The achievable multizone vibration monitoring of the present invention, has higher sensitivity and system extended capability, and system is more succinct, cost is lower.
Description
Technical field
The present invention relates to a kind of vibrating sensor more particularly to a kind of polarization interference formula defence area type all -fiber vibrating sensings
Device.
Background technology
Vibration detection sensing technology is developed so far, corresponding sensing testing method and type also continuous update with into
It is ripe.To the type of measurement and the precision measured in practical production and application, demand is increasing, it is desirable that and it is also higher and higher, this
New product, high quality, multi-functional test equipment is just promoted to continuously emerge, traditional test method and measurement means constantly by
It overturns, in extensive use, sensitivity also has flying for matter on the basis of original for various analyzers, optical fibre vibration sensor etc.
Jump.
Fibre optical sensor is a kind of novel sensor for developing rapidly after fiber optic communication succeeds.Optical fiber
Sensor has that passive, anti-electromagnetic interference capability is strong, high temperature resistant, high pressure resistant, resistance to chemical attack compared with traditional sensors
By force, lightly, high sensitivity the advantages that.Optical fiber vibration sensing technology is the skill that research and development are more active in sensory field of optic fibre
Art, it can play the role of good in high-temperature region, nuclear radiation area, higher-pressure region, and it is many to have application to national defence, production, life etc.
Field.Now widely used optical fibre vibration sensor has fiber bragg grating vibration sensor, optical fiber mach-Zeng Degan to relate to
Instrument, the vibrating sensor etc. of multimode interferometric structure are several.However, above-mentioned optical fibre vibration sensor exist response not in time, frequency spectrum
Narrow range, complicated, production cost is high, sensitivity is low, manufactures the shortcomings of difficult.
The change of extraneous physical condition is detected using the polarization state change information of light is transmitted in optical fiber, is that Rogers exists
Put forward within 1981, polarization state is very sensitive to extraneous shock wave, can theoretically optical fibre vibration sensor be made to reach pole
High sensitivity.When the single mode optical fiber in vibrating sensing unit experiences external vibration, birefringence effect, birefringence can be generated
The polarised light of parallel optical axis caused by effect and vertical optical axis is there are phase delay, and luminous power is closed with oscillation intensity into function
System.Therefore, the vibration birefringence effect based on single mode optical fiber can realize the monitoring to external vibration signal.However, existing light
The sensitivity of fine vibrating sensor and system extended capability still need to meet the requirements, and system complex, and cost of implementation is higher.
Invention content
The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and to provide a kind of polarization interference formula defence area types
All -fiber vibrating sensor has higher sensitivity and system extended capability, and system tray, it can be achieved that multizone vibration monitoring
Structure is more succinct, and cost of implementation is lower.
Polarization interference formula defence area type all -fiber vibrating sensor of the present invention includes light source, optical branching device, signal processing unit
And n sense channel, n are positive integer；The optical signal that light source is sent out is divided into n+1 roads by the optical branching device, wherein passing through all the way
It is used as after opto-electronic conversion and refers to signal input signal processing unit, in addition it is logical to input the n items detection as detection light respectively for n roads
Road；Every sense channel include an optical circulator, a photodetector, a Transmission Fibers, a polarizer, one
All -fiber vibrating sensing is popped one's head in, a, b, c port difference connecting detection light, one end of Transmission Fibers, the photoelectricity of the optical circulator
The input terminal of detector, the other end of Transmission Fibers are connected via the polarizer and all -fiber vibrating sensing probe, photodetector
Output terminal connection signal processing unit, all -fiber vibrating sensing probe is equipped with the sensor fibre of reflective mirror for end；
The signal processing unit is used to that the detection signal and reference signal of n sense channel to be handled to obtain vibration information.
Preferably, the polarizer in every sense channel is installed in a fiber optic closure to shield.
Preferably, the n Transmission Fibers are realized by a n core single modes armored optical cable.It is remote so as to effectively realize
Signal transmission reduces system cost.
Preferably, the sensor fibre is single mode optical fiber or low birefringent fiber.Preferably low birefringent fiber, so as to
Farthest reduction optical fiber double-folded on itself penetrates the influence to system stability.
Preferably, the polarizer is inclined optical fiber grating or polarizer slice.
Further preferred the, the inclined optical fiber grating inclination angle is 45 °, and grid region length is more than 5mm, and service band is
1310nm and 1550nm, extinction ratio are more than 25dB.So as to improve level of integrated system, the cost of manufacture of system is reduced, improves system
Reliability.
Preferably, the reflective mirror in all -fiber vibrating sensing probe is that the medium being plated in sensor fibre distal end faces is all-trans
Penetrate film.
Preferably, the optical branching device is PLC type optical branching device.
Compared with prior art, it the present invention and its is further improved or optimal technical scheme has the advantages that：
1. the present invention is concatenated together using multiplex mode using fibre optical sensor as sensing unit, is passed through the light of rear end
Signal demodulation, analysis and processing, realize judgement, positioning, alarm and the identification of intrusion target of intrusion event, so as to fulfill circumference
Subregion intrusion event detection function.
2. it shakes relative to fiber bragg grating vibration sensor, optical fiber mach-Zehnder interferometer, multimode interferometric structure
Dynamic sensor, the present invention have passive, simple in structure, at low cost, fast response time, high certainty of measurement, high resolution, expansible
Etc. advantages, disclosure satisfy that electric power, oil, coal mine and the various application demands for being related to multizone safety protection field.
3. in technical solution of the present invention, multi-region domain all-optical fiber vibrating sensing probe shares a light source, can simplify system tray
Structure reduces system cost, improves the scalability and durability of system, and it is flexible in the application of engineering site to improve product of the present invention
Property.
4. the present invention is based on the stress birfringence effect of single mode optical fiber, using optical polarization in optical fiber to external physical quantity
Variation is sensitive, employs the mode of polarization light modulation and relevant detection, the acquisition of high-sensitivity vibration signal is realized, using reflection
Formula system architecture can improve responding ability of the sensor to microvariations signal, improve the frequency bandwidth of sensor, response speed and
Sensitivity.
5. the present invention realizes light source power function for monitoring using special photoelectric detector, demodulate and calculate with reference to normalized signal
Method can eliminate the influence of light source ages and fiber power swing to the measuring precision, improve the reliability and stabilization of system
Property.
6. the present invention preferably 45 ° of inclined optical fiber gratings realize polarizer function, the integrated level of system can be improved, reduces system
Cost of manufacture, improve the reliability of system.
Description of the drawings
Fig. 1 is the structure diagram of polarization interference formula defence area type all -fiber vibrating sensor of the present invention；
Fig. 2 is the principle schematic of 45 ° of inclined optical fiber gratings.
The following drawings involved in figure marks：
1：Light source；2：1 × (n+1) optical branching device；(21、22…2n)：N detection optical output port of optical branching device；
2n1：The reference optical output port of optical branching device；(31、32…3n)：Optical circulator；(9,101~10n)：Photodetector；4：n
Core single mode armored optical cable；(41a、42a…4na)：One side ports of n core single mode armored optical cables；(41b、42b…4nb)：N core lists
Another side ports of mould armored optical cable；(51、52…5n)：Fiber optic closure；(61、62…6n)：The polarizer；(71、72…7n)：
Sensor fibre；(81、82…8n)：Reflective mirror.
Specific embodiment
The deficiency of face existing fiber vibrating sensing technology, thinking of the invention are using fibre optical sensor as sensitive list
Member is concatenated together using multiplex mode, by the optical signal demodulation of rear end, analysis and processing, realize intrusion event judgement,
Positioning, alarm and the identification of intrusion target so as to fulfill the subregion intrusion event detection function of circumference, can meet multizone safety
Protection requirements.Stress birfringence effect of the sensor based on single mode optical fiber, using optical polarization in optical fiber to external physical quantity
Change sensitive characteristic, employ the mode of polarization light modulation and relevant detection, realize the acquisition of high-sensitivity vibration signal.
Specifically, polarization interference formula defence area type all -fiber vibrating sensor of the present invention includes light source, optical branching device, signal
Processing unit and n sense channel, n are positive integer；The optical signal that light source is sent out is divided into n+1 roads by the optical branching device,
In be used as after opto-electronic conversion with reference to signal input signal processing unit all the way, in addition n roads input the n as detection light respectively
Sense channel；Every sense channel rises including an optical circulator, a photodetector, a Transmission Fibers, one
Inclined device, an all -fiber vibrating sensing probe, a, b, c port difference connecting detection light of the optical circulator, Transmission Fibers
One end, the input terminal of photodetector, the other end of Transmission Fibers are connected via the polarizer and all -fiber vibrating sensing probe, light
The output terminal connection signal processing unit of electric explorer, all -fiber vibrating sensing probe are equipped with the biography of reflective mirror for end
Photosensitive fibre；The signal processing unit is used to that the detection signal and reference signal of n sense channel to be handled to be shaken
Dynamic information.
The light that light source is sent out is divided into the output of n+1 roads after optical branching device, wherein the output of 1 tunnel enters as with reference to light
Photodetector for monitoring the fluctuation of light source output power, eliminates light source ages and power swing to the measuring precision
It influences, the output of remaining n road connects n sense channel respectively as detection light.Detection light is after circulator and the polarizer, shape
Into linearly polarized light, linearly polarized light enters all -fiber vibrating sensing probe.Sensor fibre in all -fiber vibrating sensing probe is shaking
Pressure effect caused by dynamic is lower to generate birefringence effect, wherein birefringence effect size (or birefringence) and pressure Cheng Han
Number relationships, the polarised light of parallel optical axis and vertical optical axis caused by birefringence effect is there are phase delay, after mirror reflection,
Light beam returns, and generates phase delay again, and reflected light is transmitted by sensor fibre, and passes through the polarizer and circulator, is sent
Toward photodetector.Phase delay causes the polarization state of incident polarized light to change, due to output polarization state and pressure Cheng Han
Number relationships, then reflected light by the polarizer close beam interferometer after luminous power have functional relation with pressure, can be counted by luminous power
Phase delay caused by calculating pressure, applies stressed size, the light for finally carrying vibration information is being believed so as to calculate
The strong and weak information of vibration signal is demodulated out at number processing unit.
For ease of public understanding, technical scheme of the present invention is further elaborated below in conjunction with the accompanying drawings：
The structure of polarization interference formula defence area type all -fiber one specific embodiment of vibrating sensor of the present invention as shown in Figure 1,
It include host, transmission cable 4, fiber optic closure 51,52 ..., 5n and n regions all -fiber vibrating sensing probe (be respectively used to
The vibration monitoring of 1~defence area of defence area n)；The host respectively includes light source 1,1 × (n+1) optical branching device 2, circulator 31,
32nd ..., 3n, photodetector 9,101,102, ..., 10n, signal processing unit (11)；The transmission cable 4 uses n core lists
Mould armored optical cable；The fiber optic closure 51,52 ..., 5n accommodate respectively the polarizer 61,62 ..., 6n, and realize each road optical fiber
The protection of splicing point；N regions all -fiber vibrating sensing probe include sensor fibre 71,72 ..., 7n and reflective mirror 81,
82、…、8n。
As shown in Figure 1, the output terminal of light source 1 is connect with the input terminal of 1 × (n+1) optical branching device 2,1 × (n+1) optical branching
The output terminal 21 of device 2 is connect with the port 31a of circulator 31, output terminal 22 and the circulator 32 of 1 × (n+1) optical branching device 2
Port 32a connections ... ..., the output terminal 2n of 1 × (n+1) optical branching device 2 are connect with the port 3na of circulator 3n, 1 × (n+1)
The output terminal 2n1 of optical branching device 2 is connect with the input terminal of photodetector 9；The port 31c and photodetector of circulator 31
101 input terminal connection, the port 32c of circulator 32 are connect with the input terminal of photodetector 102 ... ..., circulator 3n's
Port 3nc is connect with the input terminal of photodetector 10n, photodetector 9,101,102, ..., the output terminal of 10n respectively with
Signal processing unit 11 connects；The port 31b of circulator 31 is connect with the port 41a of transmission cable 4, the port of transmission cable 4
41b is connect with the input terminal of the polarizer 61, and the output terminal of the polarizer 61 is connect with the input terminal of sensor fibre 71, sensor fibre 71
Output terminal connect with reflective mirror 81；The port 32b of circulator 32 is connect with the port 42a of transmission cable 4, transmission cable 4
Port 42b is connect with the input terminal of the polarizer 62, and the output terminal of the polarizer 62 is connect with the input terminal of sensor fibre 72, sense light
The output terminal of fibre 72 is connect with reflective mirror 82；The port 3nb of circulator 3n is connect with the port 4na of transmission cable 4, transmission cable
4 port 4nb is connect with the input terminal of polarizer 6n, and the output terminal of polarizer 6n is connect with the input terminal of sensor fibre 7n, is passed
The output terminal of photosensitive fibre 7n is connect with reflective mirror 8n.
The System Working Principle of above-mentioned polarization interference formula defence area type all -fiber vibrating sensor is as follows：
According to the mode of each device of system, photodetector 101,102 can be obtained, ..., 10n input light intensity signal：
Iout1=1/2Iin cos2δ
(1)
Wherein, δ is the sensor fibre phase delay vibrated for influencing to generate；Iin is light intensity of incident light.
The light intensity signal of photodetector (9) input：
Iout2=1/2Iin
(2)
Normalization can obtain,
Iout=Iout1/Iout2=cos2δ
(3)
Pass through the detection to output intensity Iout, you can obtain vibration information.
The preferred single mode optical fiber of the sensor fibre or low birefringent fiber, preferably low birefringent fiber, so as to maximum
Reduce to degree optical fiber double-folded on itself and penetrate influence to system stability.
In order to simplify structure, cost is reduced, in the present embodiment, the reflective mirror in all -fiber vibrating sensing probe is direct
The medium total reflection film being plated in sensor fibre distal end faces.
1 × (n+1) optical branching device in the present embodiment is PLC type optical branching device.
The polarizer can be inclined optical fiber grating or polarizer slice.Common optical fiber polarizer using birefringece crystal,
The special shapes optical fiber such as polarization film, birefringence fiber winding realize that of high cost, insertion loss is big, complex manufacturing technology.This hair
The bright polarizer 41,42 ... 4n preferably 45 ° of inclined optical fiber gratings are realized.It is currently used write inclined optical fiber grating processed method be by
Phase mask rotates by a certain angle with optical fiber axial direction, using the light sensitivity of light-sensitive optical fibre, by uv-exposure, by the phase of incident light
Fibre core is written in dry field pattern, the refractive index modulation structure in an axial direction with some cycles is formed in fibre core, as shown in Figure 2.When
For index modulation striped with light propagation vertical direction there are during certain angle, incident light is distinguished in index modulation will on interface
Can reflect and reflect, when incident light index modulation distinguish interface on incidence angle meet Brewster corner condition when,
Its reflected light S light and refraction light P light are linearly polarized light, and direction of vibration is vertical with the plane of incidence.
According to snell law, Brewster's angle size is：
θB=arctan (n2/n1)
(4)
In formula, n1 is the refractive index without UV exposed areas in fibre core, and n2 is the refractive index of exposed rear modulation areas.
Using the method for uv-exposure formed photorefraotive crystal be it is very small, generally in 10-5~10-3 orders of magnitude, relatively
N2 ≈ n1 can be approximately considered in the original refractive index of fibre core, according to formula (4), Brewster's angle is 45 °.
45 ° of inclined optical fiber gratings are inscribed on light-sensitive optical fibre using motion scan phase mask technology, by adjusting grating
Section length so that 45 ° of inclined optical fiber grating output extinction ratios are more than 25dB in 1310nm and 1550nm wave bands, and degree of polarization is 99%
Above linearly polarized light, and had using 45 ° of inclined optical fiber gratings as the polarizer all-fiber, it is compact-sized, at low cost,
Polarization property is good, can long-time stable work the advantages that.
Claims (8)
1. a kind of polarization interference formula defence area type all -fiber vibrating sensor, which is characterized in that including light source, optical branching device, signal
Processing unit and n sense channel, n are positive integer；The optical signal that light source is sent out is divided into n+1 roads by the optical branching device,
In be used as after opto-electronic conversion with reference to signal input signal processing unit all the way, in addition n roads input the n as detection light respectively
Sense channel；Every sense channel rises including an optical circulator, a photodetector, a Transmission Fibers, one
Inclined device, an all -fiber vibrating sensing probe, a, b, c port difference connecting detection light of the optical circulator, Transmission Fibers
One end, the input terminal of photodetector, the other end of Transmission Fibers are connected via the polarizer and all -fiber vibrating sensing probe, light
The output terminal connection signal processing unit of electric explorer, all -fiber vibrating sensing probe are equipped with the biography of reflective mirror for end
Photosensitive fibre；The signal processing unit is used to that the detection signal and reference signal of n sense channel to be handled to be shaken
Dynamic information.
2. polarization interference formula defence area type all -fiber vibrating sensor as described in claim 1, which is characterized in that every sense channel
In the polarizer be installed in a fiber optic closure to shield.
3. polarization interference formula defence area type all -fiber vibrating sensor as described in claim 1, which is characterized in that the n items transmission
Optical fiber is realized by a n core single modes armored optical cable.
4. polarization interference formula defence area type all -fiber vibrating sensor as described in claim 1, which is characterized in that the sensor fibre
For single mode optical fiber or low birefringent fiber.
5. polarization interference formula defence area type all -fiber vibrating sensor as described in claim 1, which is characterized in that the polarizer is
Inclined optical fiber grating or polarizer slice.
6. polarization interference formula defence area type all -fiber vibrating sensor as claimed in claim 5, which is characterized in that the inclination optical fiber
Grating inclination angle is 45 °, and grid region length is more than 5mm, and service band is 1310nm and 1550nm, and extinction ratio is more than 25dB.
7. polarization interference formula defence area type all -fiber vibrating sensor as described in claim 1, which is characterized in that all -fiber vibration passes
Reflective mirror in sense probe is the medium total reflection film being plated in sensor fibre distal end faces.
8. polarization interference formula defence area type all -fiber vibrating sensor as described in claim 1, which is characterized in that the optical branching device
For PLC type optical branching device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810232256.3A CN108168687A (en) | 2018-03-21 | 2018-03-21 | A kind of polarization interference formula defence area type all -fiber vibrating sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810232256.3A CN108168687A (en) | 2018-03-21 | 2018-03-21 | A kind of polarization interference formula defence area type all -fiber vibrating sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108168687A true CN108168687A (en) | 2018-06-15 |
Family
ID=62511221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810232256.3A Pending CN108168687A (en) | 2018-03-21 | 2018-03-21 | A kind of polarization interference formula defence area type all -fiber vibrating sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108168687A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117723144A (en) * | 2024-02-07 | 2024-03-19 | 青岛哈尔滨工程大学创新发展中心 | Polarization modulation type underwater sound detection device, method and hydrophone |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871809A (en) * | 2010-06-25 | 2010-10-27 | 北京奥普科达科技有限公司 | Defense area optical fiber distribution type vibration sensor and perimeter alarm system adopting same |
| CN101968161A (en) * | 2010-11-10 | 2011-02-09 | 于晋龙 | Distributed optical fiber polarization sensor based automatic early warning system of intelligent pipeline |
| CN102128967A (en) * | 2010-12-15 | 2011-07-20 | 北京航空航天大学 | Optical fiber current transformer for three-phase common super-fluorescence optical fiber light source |
| CN102168953A (en) * | 2011-01-12 | 2011-08-31 | 南京大学 | Full-distributed optical fiber strain and vibration sensor based on coherent heterodyne detection |
| CN102721459A (en) * | 2012-05-29 | 2012-10-10 | 北京航空航天大学 | Optical fiber hydrophone array adopting reflective quasi-reciprocity optical path |
| US20120286767A1 (en) * | 2009-12-29 | 2012-11-15 | Closed Joint Stock Company "Profotech" (Cjsc "Profotech") | Fiber optic current sensor |
| CN104950154A (en) * | 2014-03-31 | 2015-09-30 | 北京自动化控制设备研究所 | High-precision high-reliability and all-fiber current transformer |
| CN106652285A (en) * | 2016-10-18 | 2017-05-10 | 上海广拓信息技术有限公司 | Distributed multi-defence-area vibration optical fiber perimeter alarm system and perimeter monitoring method |
| CN207991682U (en) * | 2018-03-21 | 2018-10-19 | 南京曦光信息科技有限公司 | A kind of polarization interference formula defence area type all -fiber vibrating sensor |
-
2018
- 2018-03-21 CN CN201810232256.3A patent/CN108168687A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120286767A1 (en) * | 2009-12-29 | 2012-11-15 | Closed Joint Stock Company "Profotech" (Cjsc "Profotech") | Fiber optic current sensor |
| CN101871809A (en) * | 2010-06-25 | 2010-10-27 | 北京奥普科达科技有限公司 | Defense area optical fiber distribution type vibration sensor and perimeter alarm system adopting same |
| CN101968161A (en) * | 2010-11-10 | 2011-02-09 | 于晋龙 | Distributed optical fiber polarization sensor based automatic early warning system of intelligent pipeline |
| CN102128967A (en) * | 2010-12-15 | 2011-07-20 | 北京航空航天大学 | Optical fiber current transformer for three-phase common super-fluorescence optical fiber light source |
| CN102168953A (en) * | 2011-01-12 | 2011-08-31 | 南京大学 | Full-distributed optical fiber strain and vibration sensor based on coherent heterodyne detection |
| CN102721459A (en) * | 2012-05-29 | 2012-10-10 | 北京航空航天大学 | Optical fiber hydrophone array adopting reflective quasi-reciprocity optical path |
| CN104950154A (en) * | 2014-03-31 | 2015-09-30 | 北京自动化控制设备研究所 | High-precision high-reliability and all-fiber current transformer |
| CN106652285A (en) * | 2016-10-18 | 2017-05-10 | 上海广拓信息技术有限公司 | Distributed multi-defence-area vibration optical fiber perimeter alarm system and perimeter monitoring method |
| CN207991682U (en) * | 2018-03-21 | 2018-10-19 | 南京曦光信息科技有限公司 | A kind of polarization interference formula defence area type all -fiber vibrating sensor |
Non-Patent Citations (2)
| Title |
|---|
| 孙晓东;任晓霞;王琳;: "应用于定位的光纤振动传感技术的发展现状", 工业仪表与自动化装置, no. 02, pages 21 - 25 * |
| 张国顺 等: "《光纤传感技术》", 31 October 1988, 水利电力出版社, pages: 347 - 350 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117723144A (en) * | 2024-02-07 | 2024-03-19 | 青岛哈尔滨工程大学创新发展中心 | Polarization modulation type underwater sound detection device, method and hydrophone |
| CN117723144B (en) * | 2024-02-07 | 2024-04-23 | 青岛哈尔滨工程大学创新发展中心 | Polarization modulation type underwater sound detection device, method and hydrophone |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109238355B (en) | Device and method for simultaneously sensing and measuring distributed dynamic and static parameters of optical fiber | |
| EP3551963B1 (en) | Waveguide interferometer | |
| CN106680535B (en) | The differential-type optical accelerometer of laser beat frequency is realized based on Fiber Bragg Grating Reflective Spectrum Characteristics | |
| CN108168728A (en) | Non-equilibrium polarization maintaining optical fibre dual interferometer temperature strain simultaneous measuring apparatus and method | |
| US6363180B1 (en) | Methods and apparatus for enhancing dynamic range, sensitivity, accuracy, and resolution in fiber optic sensor systems | |
| WO1992021949A1 (en) | Determination of induced change of polarization state of light | |
| CN207991682U (en) | A kind of polarization interference formula defence area type all -fiber vibrating sensor | |
| CN103017687A (en) | Orthogonal polarization fiber bragg grating vector torsion sensing device and detection method thereof | |
| CN108287056B (en) | System and method for evaluating coupling characteristics of optical fiber sensitive ring polarization mode | |
| Yao et al. | Fiber optical intensity sensors | |
| CN101639387B (en) | Optical fiber temperature sensor for detection based on wavelength corresponding to extreme value and temperature sensing method | |
| CN110333016A (en) | Stress sensing device and demodulation method based on Mixed cascading fibre optic interferometer | |
| CN105758567A (en) | Fiber interference type pressure sensor based on 3*3 coupler | |
| CN108844614A (en) | Chaos Brillouin light domain of dependence analysis system and method based on phase spectrometry | |
| US5062686A (en) | Optical sensors and optical fibre networks for such sensors | |
| CN108680275A (en) | Optical-fiber probe type temperature and strain gauge based on single dislocation welding | |
| CN108254101A (en) | A kind of polarization interference formula passive fiber temperature sensor | |
| CN108168687A (en) | A kind of polarization interference formula defence area type all -fiber vibrating sensor | |
| CN105806511B (en) | The micro optical fiber microminiature temperature sensor of cascaded structure is bored based on ball | |
| CN106680536A (en) | High-sensitivity single polarization-maintaining fiber interference type acceleration speed sensing system | |
| CN110196071A (en) | Based on Fabry Perot chamber side throwing fibre optical sensor and preparation method thereof | |
| Rajan | Introduction to optical fiber sensors | |
| CN205958141U (en) | Temperature -detecting device based on receive long period fiber grating sensor a little | |
| CN207991710U (en) | A kind of polarization interference formula passive fiber temperature sensor | |
| CN108645444A (en) | The temperature and strain gauge of optical-fiber probe type based on single spherical welding |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |