CN102721458A - Optical fiber hydrophone adopting reflective quasi-reciprocity optical path - Google Patents
Optical fiber hydrophone adopting reflective quasi-reciprocity optical path Download PDFInfo
- Publication number
- CN102721458A CN102721458A CN201210172066XA CN201210172066A CN102721458A CN 102721458 A CN102721458 A CN 102721458A CN 201210172066X A CN201210172066X A CN 201210172066XA CN 201210172066 A CN201210172066 A CN 201210172066A CN 102721458 A CN102721458 A CN 102721458A
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- phase
- modulator
- fiber
- output terminal
- 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
Images
Landscapes
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention belongs the technical field of optical fiber sensing, and particularly discloses an optical fiber hydrophone adopting a reflective quasi-reciprocity optical path. The optical fiber hydrophone comprises a light source, a shunt, a polarizer, a phase modulator, a delay optical fiber, a faraday rotator, an acoustic probe, a compensated optical fiber, a reflector and a photoelectric detector. The invention provides the optical fiber hydrophone adopting the reflective quasi-reciprocity optical path, can effectively inhibit the polarization state random fluctuation in the optical path and solves the problem of polarization-induced fading of a conventional hydrophone. The invention adopts the quasi-reciprocity optical path scheme, so that the immunocompetence for the environmental interference is strong. The invention also adopts the reflective optical path, a signal passes through the acoustic probe back and forth for twice and the efficiency of detecting a sound pressure signal is twice of that of a conventional optical fiber sensor and the sensitivity is effectively improved; and the optical fiber is used as an information sensing and transmitting medium, so that the optical fiber hydrophone cannot be interfered by the electromagnet.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, be specifically related to utilize a kind of fibre optic hydrophone that adopts reflective accurate reciprocity light path of interference light phase-detection acoustic pressure.
Background technology
Sound wave be at present can long-distance transmissions information in the ocean effective carrier.In the ocean, survey the space-time structure of the formed sound field of sound wave that is loaded with signal; It is the important means of carrying out undersea detection, identification, communication and environmental monitoring etc.; It both can be used for remote military target and had surveyed; Seabed mineral reserve exploitation, the locating fish can also be used for remote measurement and ocean, the land seismic event detection etc. of drive marine process (interior ripple, circulation).Therefore, advanced underwater sound Detection Techniques are for national economy, and national defense construction and scientific research all have significance.
Fibre optic hydrophone is a kind of underwater signal sensor that is based upon on optical fiber, the photoelectron technology basis that grows up in late nineteen seventies.It utilizes intensity, phase place, polarization state or other parameter of light wave in the sound wave modulation optical fiber to carry out sound/light conversion; Convert underwater sound signal to light signal; And reach signal processing system through optical fiber and extract acoustical signal information, its sensitivity is compared the Senior Three one magnitude with the conventional piezoelectric nautical receiving set.Fibre optic hydrophone light harvesting fiber sensor is highly sensitive, frequency response is wide, anti-electromagnetic interference (EMI), adverse environment resistant, structure dexterous, be easy to superiority such as remote measurement and forming array in one; It is one of important directions of optical fiber sensing technology research; Also be one of main developing direction of underwater sound sensor of new generation, it has received the great attention of the various countries militaries in the research of military field with application.
Since people such as US Naval Research Laboratory Bucaro in 1977 have delivered first piece of paper about fibre optic hydrophone, passed through the research and development in 30 years.Particularly in recent years; Along with developing rapidly of optical fiber communication and photoelectron technology, optical fiber sensing technology reaches its maturity, and fibre optic hydrophone also moves towards practical applications by laboratory study; Becoming the important directions of modern optical fiber sensing technology development, also is the main developing direction of underwater sound sensing technology.
Fibre optic hydrophone can be divided into intensity type, interfere type, grating type etc. by principle.Wherein the structure of intensity type fibre optic hydrophone and input are simple relatively; There are not the problems such as signal dropout that signal phase fluctuates and the polarization state random variation causes that exist in the interference type optical fiber hydrophone; But detection sensitivity is not as good as interfere type; Also being unfavorable for forming array structure, bigger limitation is arranged, is the main contents of early stage optical fiber underwater sound Research on Sensing.Along with the rise of interference type optical fiber hydrophone research, its gordian technique is progressively full-fledged, and oneself is through forming product in certain fields, and the research focus of fibre optic hydrophone transfers interfere type to from intensity type.
Interference type optical fiber hydrophone is based on the principles of construction of optical interdferometer, utilizes sound field that the transmission phase place of light wave in the optical fiber is modulated, and through fibre optic interferometer, this phase modulation (PM) is detected also demodulation come out and realization sound sensing.The fibre optic interferometer structure that can realize interference type optical fiber hydrophone mainly contains four kinds, is respectively Mach-Zehnder type interferometer, Michelson type interferometer, Fabry-Perot type interferometer, Sagnac type interferometer etc.Wherein, the sensitivity of Fabry-Perot type fibre optic hydrophone is very high, but its dynamic range is little, is subject to the influence that optical path loss changes, and particularly the signal demodulated complex is inappropriate for multiplex technique, and the research that is used for underwater sound sensing is less.At present, being studied maximum fibre optic hydrophones that is based on Mach-Zehnder interferometer and Michelson interferometer, also is the most ripe interference type optical fiber hydrophone of technology.But there is intrinsic problem in these two kinds of interferometers, such as because two interference arms are difficult to guarantee that length is consistent, in some is used, also can strengthen the optical path difference of two arms artificially, and this will make the phase noise of light source in the double light path interferometer convert intensity noise into.In addition, the light path of two bundle coherent lights is different, and random fluctuation can take place the polarization state of two-beam, is difficult to be consistent, and this will cause the contrast of interference signal to reduce, contrast even be zero under the serious situation.Though and solved the problem of polarization state random fluctuation based on the fibre optic hydrophone of Sagnac type interferometer because Sagnac type interferometer is the reciprocity light path system, have intrinsic insensitivity for low frequency signal, have certain limitation.
Scale Fiber-Optic Hydrophone Array in that following military field is used will be towards multinode, and the direction of big monitoring range develops, and each array will comprise dozens or even hundreds of node, the monitoring range of hundreds of kilometer.Various countries focus on to the emphasis of fibre optic hydrophone technical research how to make full use of fiber transmission attenuation low in recent years; The characteristics that transport tape is roomy, and the latest developments of combination integrated opto-electronic device realize light source; Optical fiber and photodetector multiplexed; Form the distribution type fiber-optic hydrophone array with less assembly, both low like this system cost has reduced the complexity of safeguarding again.And can improve the detection performance of whole multiplex system greatly through the array Signal Processing, and obtaining the information of more relevant submarine targets, the array that adopts at present is all based on above traditional fibre optic hydrophone scheme.
Summary of the invention
To the problem that exists in the prior art; The present invention proposes a kind of Scale Fiber-Optic Hydrophone Array that adopts reflective accurate reciprocity light path, comprises light source, shunt, the polarizer, phase-modulator, delay optical fiber, Faraday polarization apparatus, sonic probe, compensated optical fiber, catoptron and photodetector.
The tail optical fiber of light source is welded together with one tunnel input end fiber of shunt, and another input end fiber of the tail optical fiber of photodetector and shunt is welded together; The output terminal optical fiber of shunt is with polarizer welding; The output terminal polarization maintaining optical fibre of the polarizer and the input end polarization maintaining optical fibre of phase-modulator are with 45 ° of weldings; The output terminal optical fiber of phase-modulator is with the input end fiber welding that postpones optical fiber; The output terminal optical fiber that postpones optical fiber is with the welding of Faraday polarization apparatus input end, the input end fiber welding of Faraday polarization apparatus output terminal optical fiber and sonic probe sensor fibre, and the other end optical fiber of sonic probe sensor fibre and compensated optical fiber are with 90 ° of weldings; The compensated optical fiber other end connects catoptron; The output terminal of photodetector is connected with signal processing circuit, and the interference light signal that comprises acoustic pressure information that photodetector will obtain converts electric signal into and offers signal processing circuit, and signal processing circuit detects this electric signal and obtains sound pressure level; And output, thereby the synchronous signal treatment circuit should be exported signal and was applied on the phase-modulator realization phase modulation (PM).
Described fibre optic hydrophone can also be for replacing to phase-modulator the integrated phase modulator; Direct and the integrated phase modulator welding of the output terminal optical fiber of shunt; The integrated phase modulator has also had inclined to one side function simultaneously; Therefore can remove the polarizer; Two output terminal polarization maintaining optical fibres of integrated phase modulator respectively with two input end polarization maintaining optical fibres welding of polarization beam splitting/bundling device, the output terminal optical fiber of polarization beam splitting/bundling device is again with the input end fiber welding that postpones optical fiber then, thus an output terminal of synchronous signal treatment circuit provides electric signal to realize phase modulation (PM) for the integrated phase modulator.
The invention has the advantages that:
(1) the present invention proposes a kind of fibre optic hydrophone that adopts reflective accurate reciprocity light path, can effectively suppress the polarization state random fluctuation in the light path, has solved the polarization decay problem of traditional nautical receiving set.
(2) the present invention proposes a kind of fibre optic hydrophone that adopts reflective accurate reciprocity light path, adopts accurate reciprocity light path scheme, and is therefore very strong to the immunocompetence of environmental disturbances.
(3) the present invention proposes a kind of fibre optic hydrophone that adopts reflective accurate reciprocity light path, adopts reflective light path, and signal is twice process sonic probe back and forth, and detecting sound pressure signal is the twice of conventional fiber sensor, has effectively improved sensitivity.
(4) the present invention proposes a kind of fibre optic hydrophone that adopts reflective accurate reciprocity light path, with sensing and the transmission medium of optical fiber as information, and can be by electromagnetic interference (EMI).
Description of drawings
Fig. 1 is that the present invention proposes a kind of structural representation that adopts phase-modulator to constitute the fibre optic hydrophone of reflective accurate reciprocity light path.
Fig. 2 is that the present invention proposes a kind of structural representation that adopts the integrated phase modulator to constitute the fibre optic hydrophone of reflective accurate reciprocity light path.
Among the figure:
1, light source 2, shunt 3, the polarizer
4, phase-modulator 5, delay optical fiber 6, Faraday polarization apparatus
7, sonic probe 8, compensated optical fiber 9, catoptron
10, photodetector 11, integrated phase modulator 12, polarization beam splitting/bundling device
13, signal processing circuit
Embodiment
To combine accompanying drawing that the present invention is done further detailed description below.
The present invention proposes a kind of fibre optic hydrophone that adopts reflective accurate reciprocity light path; As shown in Figure 1, specifically comprise light source 1, shunt 2, the polarizer 3, phase-modulator 4, postpone optical fiber 5, Faraday polarization apparatus 6, sonic probe 7, compensated optical fiber 8, catoptron 9 and photodetector 10.
Light signal has the two-way input at the input end of shunt: the one tunnel is that the tail optical fiber of light source 1 is welded together with an input end fiber of shunt 2, and another road is that the tail optical fiber of photodetector 10 and another input end fiber of shunt 2 are welded together; The output terminal optical fiber of shunt 2 is with the polarizer 3 weldings; The output terminal polarization maintaining optical fibre of the polarizer 3 and the input end polarization maintaining optical fibre of phase-modulator 4 are with 45 ° of weldings; The output terminal optical fiber of phase-modulator 4 is with the input end fiber welding that postpones optical fiber 5; The output terminal optical fiber that postpones optical fiber 5 is with Faraday polarization apparatus 6 input end weldings; The input end fiber welding of Faraday polarization apparatus 6 output terminal optical fiber and sonic probe 7 sensor fibres, the other end optical fiber of sonic probe 7 sensor fibres and compensated optical fiber 8 are with 90 ° of weldings, and compensated optical fiber 8 other ends connect catoptron 9.The output terminal of photodetector 10 is connected with signal processing circuit 13; The interference light signal that comprises acoustic pressure information that photodetector 10 will obtain converts electric signal into and offers signal processing circuit; Signal processing circuit 13 detects this electric signal and obtains sound pressure level; And output, thereby synchronous signal treatment circuit 13 should be exported signal and imposed on phase-modulator 4 realization phase modulation (PM).
Described Scale Fiber-Optic Hydrophone Array can also be for replacing with the integrated phase modulator with phase-modulator 4; As shown in Figure 2; Direct and integrated phase modulator 11 weldings of the output terminal optical fiber of shunt 2; The integrated phase modulator has also had inclined to one side function simultaneously; Therefore remove the polarizer, two output terminal polarization maintaining optical fibres of integrated phase modulator 11 respectively with two input end polarization maintaining optical fibres welding of polarization beam splitting/bundling device 12, the output terminal optical fiber of polarization beam splitting/bundling device 12 is again with the input end fiber welding that postpones optical fiber 5 then.Thereby the synchronous signal treatment circuit imposes on integrated phase modulator 11 with detected sound pressure level as the output electric signal and realizes phase modulation (PM).
The ultimate principle of light path is: the light that is at first sent by wide spectrum light source is through behind the coupling mechanism, worked being biased into the line polarisation by the polarizer, forms the two-beam of quadratures then through 45 ° of fusing points; Modulate respectively at phase-modulator,, get into sonic probe through postponing to rotate 45 ° at Faraday polarization apparatus behind the optical fiber; Because sonic probe adopts polarization maintaining optical fibre, so sonic probe responds to acoustic pressure to be measured, and polarization maintaining optical fibre is modulated; Produce phase change between two patterns of cross polarization of transmission light, get into the reciprocity compensated optical fiber with 90 ° then, compensation is because the optical path difference that the birefringence of sonic probe polarization maintaining optical fibre produces; And through reflection, secondary is through sonic probe, and sensitive signal doubles; Through postponing optical fiber, the light in polarizer place and two patterns interferes at last then.After carrying the light back light electric explorer (PIN) of interferometric phase information, detect by signal processing circuit.The same light path of Y type integrated optical modulator (Y waveguide) that adopts also can reach identical purpose; Its light path ultimate principle is identical; Just wide spectrum light source plays inclined to one side beam split and modulation at the Y waveguide place; Locate to form the light of orthogonal modes at polarization beam splitting/bundling device (PBS), sensor mechanism thereafter is identical, forms at the Y waveguide place at last and interferes.
Photodetector obtains interference light signal I
D(t) expression formula is:
I wherein
0For arriving the light intensity of detector, φ
m(t) be the phase modulation of phase-modulator, φ
sBe the phase differential that causes owing to responsive acoustic pressure, τ is the transit time of light in postponing optical fiber, the t express time.
Described light source 1 can be wide range light sources such as SLD light source, Er-Doped superfluorescent fiber source or led light source.The sensor fibre of described sonic probe 9 adopts polarization maintaining optical fibre.Described shunt can be polarization maintaining optical fibre annular device, polarization-maintaining coupler, single-mode fiber circulator or monomode coupler.Described delay optical fiber 5 can be that wire jumper connects, the welding mode with being connected of phase-modulator 4, Faraday polarization apparatus 6.Catoptron 11 can be employed in the fiber end face plated film or adopt independent catoptron.Faraday polarization apparatus 8 optically-active angles are 45 °.The modulation system of phase-modulator 4 and integrated phase modulator 11 can adopt square-wave frequency modulation, sine wave modulation.
Claims (10)
1. a fibre optic hydrophone that adopts reflective accurate reciprocity light path is characterized in that: comprise light source, shunt, the polarizer, phase-modulator, delay optical fiber, Faraday polarization apparatus, sonic probe, compensated optical fiber, catoptron and photodetector.
The tail optical fiber of light source is welded together with one tunnel input end fiber of shunt, and another input end fiber of the tail optical fiber of photodetector and shunt is welded together; The output terminal optical fiber of shunt is with polarizer welding; The output terminal polarization maintaining optical fibre of the polarizer and the input end polarization maintaining optical fibre of phase-modulator are with 45 ° of weldings; The output terminal optical fiber of phase-modulator is with the input end fiber welding that postpones optical fiber; The output terminal optical fiber that postpones optical fiber is with the welding of Faraday polarization apparatus input end, the input end fiber welding of Faraday polarization apparatus output terminal optical fiber and sonic probe sensor fibre, and the other end optical fiber of sonic probe sensor fibre and compensated optical fiber are with 90 ° of weldings; The compensated optical fiber other end connects catoptron; The output terminal of photodetector is connected with signal processing circuit, and the interference light signal that comprises acoustic pressure information that photodetector will obtain converts electric signal into and offers signal processing circuit, and signal processing circuit detects this electric signal and obtains sound pressure level; And output, thereby the synchronous signal treatment circuit will export signal and be applied on the phase-modulator realization phase modulation (PM).
2. a kind of fibre optic hydrophone that adopts reflective accurate reciprocity light path according to claim 1; It is characterized in that: in the described fibre optic hydrophone phase-modulator is replaced to the integrated phase modulator; Direct and the integrated phase modulator welding of the output terminal optical fiber of shunt; The integrated phase modulator has also had inclined to one side function simultaneously; Therefore remove the polarizer; Two output terminal polarization maintaining optical fibres of integrated phase modulator respectively with two input end polarization maintaining optical fibres welding of polarization beam splitting/bundling device, the output terminal optical fiber of polarization beam splitting/bundling device is again with the input end fiber welding that postpones optical fiber then, thus an output terminal of synchronous signal treatment circuit provides electric signal to realize phase modulation (PM) for the integrated phase modulator.
3. a kind of fibre optic hydrophone that adopts reflective accurate reciprocity light path according to claim 1 is characterized in that: described light source is SLD light source, Er-Doped superfluorescent fiber source or led light source.
4. a kind of fibre optic hydrophone that adopts reflective accurate reciprocity light path according to claim 1 is characterized in that: the sensor fibre of described sonic probe adopts polarization maintaining optical fibre.
5. a kind of fibre optic hydrophone that adopts reflective accurate reciprocity light path according to claim 1 is characterized in that: described shunt is polarization maintaining optical fibre annular device, polarization-maintaining coupler, single-mode fiber circulator or monomode coupler.
6. a kind of fibre optic hydrophone that adopts reflective accurate reciprocity light path according to claim 1 is characterized in that: described delay optical fiber is that wire jumper is connected or the welding mode with the connected mode of phase-modulator, Faraday polarization apparatus.
7. a kind of fibre optic hydrophone that adopts reflective accurate reciprocity light path according to claim 1 is characterized in that: described catoptron is employed in the fiber end face plated film or adopts independent catoptron.
8. a kind of fibre optic hydrophone that adopts reflective accurate reciprocity light path according to claim 1 is characterized in that: the optically-active angle of described Faraday polarization apparatus is 45 °.
9. a kind of fibre optic hydrophone that adopts reflective accurate reciprocity light path according to claim 1 is characterized in that: the modulation system of described phase-modulator adopts square-wave frequency modulation or sine wave modulation.
10. a kind of fibre optic hydrophone that adopts reflective accurate reciprocity light path according to claim 1, it is characterized in that: described photodetector obtains interference light signal I
D(t) expression formula is:
I wherein
0For arriving the light intensity of detector, φ
m(t) be the phase modulation of phase-modulator, φ
sBe the phase differential that causes owing to responsive acoustic pressure, τ is the transit time of light in postponing optical fiber, the t express time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210172066XA CN102721458A (en) | 2012-05-29 | 2012-05-29 | Optical fiber hydrophone adopting reflective quasi-reciprocity optical path |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210172066XA CN102721458A (en) | 2012-05-29 | 2012-05-29 | Optical fiber hydrophone adopting reflective quasi-reciprocity optical path |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102721458A true CN102721458A (en) | 2012-10-10 |
Family
ID=46947283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210172066XA Pending CN102721458A (en) | 2012-05-29 | 2012-05-29 | Optical fiber hydrophone adopting reflective quasi-reciprocity optical path |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102721458A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104408973A (en) * | 2014-11-24 | 2015-03-11 | 上海交通大学 | Inland waterway real-time monitoring system based on optical fiber acoustic sensor array |
| CN109374114A (en) * | 2018-11-22 | 2019-02-22 | 浙江大学 | A kind of interference type optical fiber hydrophone carrying polarized microwave state separation switch technology based on light |
| CN111504176A (en) * | 2020-04-30 | 2020-08-07 | 浙江大学 | Large optical path closed-loop measurement system based on two-stage actuator structure |
| CN112629697A (en) * | 2020-12-10 | 2021-04-09 | 上海金智晟东电力科技有限公司 | Quasi-reciprocal reflective optical fiber temperature sensor |
| CN114061731A (en) * | 2021-09-27 | 2022-02-18 | 北京自动化控制设备研究所 | Non-magnetic interference type optical fiber vector hydrophone |
| CN114370928A (en) * | 2022-01-12 | 2022-04-19 | 南京大学 | Linear type sagnac interferometric optical fiber vibration sensor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1687795A (en) * | 2005-06-13 | 2005-10-26 | 北京航空航天大学 | Optical fibre current transformer and its loop detector of transformer |
| CN101424708A (en) * | 2008-12-05 | 2009-05-06 | 北京航空航天大学 | Optical voltage transformer |
| CN101608946A (en) * | 2009-06-23 | 2009-12-23 | 中国人民解放军海军工程大学 | Fiber laser hydrophone signal demodulating system |
| CN102095487A (en) * | 2010-11-10 | 2011-06-15 | 中国科学院声学研究所 | Optical path structure of time-division-multiplexing optical fiber hydrophone array and modulation and demodulation method thereof |
-
2012
- 2012-05-29 CN CN201210172066XA patent/CN102721458A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1687795A (en) * | 2005-06-13 | 2005-10-26 | 北京航空航天大学 | Optical fibre current transformer and its loop detector of transformer |
| CN101424708A (en) * | 2008-12-05 | 2009-05-06 | 北京航空航天大学 | Optical voltage transformer |
| CN101608946A (en) * | 2009-06-23 | 2009-12-23 | 中国人民解放军海军工程大学 | Fiber laser hydrophone signal demodulating system |
| CN102095487A (en) * | 2010-11-10 | 2011-06-15 | 中国科学院声学研究所 | Optical path structure of time-division-multiplexing optical fiber hydrophone array and modulation and demodulation method thereof |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104408973A (en) * | 2014-11-24 | 2015-03-11 | 上海交通大学 | Inland waterway real-time monitoring system based on optical fiber acoustic sensor array |
| CN104408973B (en) * | 2014-11-24 | 2017-05-10 | 上海交通大学 | Inland waterway real-time monitoring system based on optical fiber acoustic sensor array |
| CN109374114A (en) * | 2018-11-22 | 2019-02-22 | 浙江大学 | A kind of interference type optical fiber hydrophone carrying polarized microwave state separation switch technology based on light |
| CN111504176A (en) * | 2020-04-30 | 2020-08-07 | 浙江大学 | Large optical path closed-loop measurement system based on two-stage actuator structure |
| CN111504176B (en) * | 2020-04-30 | 2021-03-30 | 浙江大学 | Large optical path closed-loop measurement system based on two-stage actuator structure |
| CN112629697A (en) * | 2020-12-10 | 2021-04-09 | 上海金智晟东电力科技有限公司 | Quasi-reciprocal reflective optical fiber temperature sensor |
| CN114061731A (en) * | 2021-09-27 | 2022-02-18 | 北京自动化控制设备研究所 | Non-magnetic interference type optical fiber vector hydrophone |
| CN114370928A (en) * | 2022-01-12 | 2022-04-19 | 南京大学 | Linear type sagnac interferometric optical fiber vibration sensor |
| CN114370928B (en) * | 2022-01-12 | 2023-08-22 | 南京大学 | Linear type Sagnac interference type optical fiber vibration sensor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102721459B (en) | Optical fiber hydrophone array adopting reflective quasi-reciprocity optical path | |
| CN100561144C (en) | Distributed optical fiber vibration sensing method and device | |
| CN203561437U (en) | Random-position fiber-distributed sound wave sensor | |
| CN102721458A (en) | Optical fiber hydrophone adopting reflective quasi-reciprocity optical path | |
| CN102997061B (en) | Optical fiber sensor-based natural gas pipeline leakage monitoring system | |
| CN102168808A (en) | Distributed optical fiber vibration sensor | |
| AU4092100A (en) | Intrinsic securing of fibre optic communication links | |
| CN105973450B (en) | Optical fiber Fizeau interference arrays distributed vibration sensing system and method | |
| CN104567959B (en) | Large-dynamic interference type optical fiber sensor based on two-channel unbalanced interferometer | |
| CN102997946A (en) | Fiber-distributed disturbance sensor and disturbance positioning method thereof | |
| CN103630229B (en) | A kind of differential coherence time domain scatter-type distributed optical fiber vibration sensing method and system | |
| CN107907202B (en) | It is a kind of to realize common-mode noise from the optical fiber vector hydrophone and its method for sensing inhibited | |
| CN101871809A (en) | Defense area optical fiber distribution type vibration sensor and perimeter alarm system adopting same | |
| CN103575379A (en) | Random position point optical fiber distributed sonic sensor | |
| CN101465052A (en) | Safety monitoring system and method for circumference | |
| CN111103051A (en) | Optical fiber interference type hydrophone detection system and method | |
| CN101799555A (en) | Optical fiber ocean bottom seismograph | |
| US10145726B2 (en) | Fiber optic acoustic wave detection system | |
| CN102508177A (en) | Optical fibre magnetic field sensor employing reflecting reciprocal light path | |
| CN111308125B (en) | Acceleration detection method based on optical fiber Sagnac interferometer and acceleration meter | |
| CN101581586B (en) | Distributed optical fiber sagnac positioning sensor inhibiting dead zone of sensor | |
| Yu et al. | Distributed optical fiber vibration sensing using phase-generated carrier demodulation algorithm | |
| CN113503955A (en) | Optical fiber hydrophone based on optical frequency domain reflection technology | |
| CN201130407Y (en) | Device for monitoring perimeter safety | |
| CN115200691A (en) | Few-mode optical fiber distributed acoustic sensing system and signal processing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20121010 |