CN102564642B - Fully-distributed optical fiber sensor for optical fiber Raman frequency shifter fused with Raman amplification effect - Google Patents
Fully-distributed optical fiber sensor for optical fiber Raman frequency shifter fused with Raman amplification effect Download PDFInfo
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- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35338—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using other arrangements than interferometer arrangements
- G01D5/35354—Sensor working in reflection
- G01D5/35358—Sensor working in reflection using backscattering to detect the measured quantity
- G01D5/35364—Sensor working in reflection using backscattering to detect the measured quantity using inelastic backscattering to detect the measured quantity, e.g. using Brillouin or Raman backscattering
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- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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- G—PHYSICS
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- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
- G01K11/324—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres using Raman scattering
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Abstract
The utility model discloses a fully-distributed optical fiber sensor for an optical fiber Raman frequency shifter fused with Raman amplification effect. In the sensor, a 1550 nm optical fiber pulse laser generates a laser pulse to be divided into two laser beams through an optical fiber splitter, wherein one laser beam is converted into broad-spectrum stokes Raman light through the optical fiber Raman frequency shifter, then the broad-spectrum stokes Raman light enters an sensing optical fiber, the other laser beam enters the same sensing optical fiber with the broad-spectrum stokes Raman light through an optical fiber combiner after passing through a time-delay optical fiber, the two laser beams are fused at the position where the sensing optical fibers meet under the nonlinear interaction to obtain a 1660 nm wide spectral band pulse laser light amplified by an Raman amplifier and used as a light source for the fully-distributed optical fiber sensor, after the 1550 nm laser Rayleigh scattering light is deducted in the 1550 nm broad-spectrum anti-stokes Raman light generated in the sensing optical fiber and provided with temperature information through an optical fiber narrowband reflection filter, the 1550 nm broad-spectrum anti-stokes Raman light enters a photoelectric receiving module with 1660 nm Rayleigh scattering light with strain information, and the temperature and strain information on the sensing optical fiber is obtained through demodulation from a digital signal processor and an industrial computer. The fully-distributed optical fiber sensor for the optical fiber Raman frequency shifter fused with Raman amplification effect is suitable for monitoring the petrochemical pipelines, tunnels and large-scale civil engineering within the range of remote 60 kilometers and monitoring the disaster forecast.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, relate in particular to a kind of optical fiber Raman temperature sensor.
Background technology
In recent years, utilize fiber raman scattering light Strong degree to be subjected to the effect of temperature modulation and optical time domain reflection (OTDR) principle to be developed into distributed optical fiber Raman temperature sensor, it can online real-time prediction scene temperature and the orientation of temperature variation, the variation of on-line monitoring scene temperature, in certain temperature range alarm temperature is set, be a kind of line-type heat detector of essential safe type, the on-line monitoring sensing net of being made up of distributed optical fiber Raman temperature sensor is in power industry, petroleum chemical enterprise, successfully use in field such as large scale civil engineering and online disaster monitoring.
In the research and practical application of distributing optical fiber sensing net, there is the great demand of long distance, high precision and high resolving power sensing; Also there is the multi-parameter sensing problem.
Zhang Zaixuan proposed " fully distributed fiber Rayleigh and Raman scattering photon strain, temperature sensor " (Chinese invention patent: ZL200910099463.7 in 2009, on September 29th, 2010 authorized), in being only applicable to, short distance 100m-15km on-line temperature monitoring, can not satisfy the safety and Health monitoring of petroleum pipe line, transferring electric power cable in recent years fully, to active demand long-range, the very-long-range distributed optical fiber Raman temperature sensor (DOFRTS) with self-correction.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, a kind of full distribution optical fiber sensor that merges the fiber Raman frequency shifter of Raman enlarge-effect is provided.
The objective of the invention is to be achieved through the following technical solutions, a kind of full distribution optical fiber sensor that merges the fiber Raman frequency shifter of Raman enlarge-effect is characterized in that comprising fiber pulse laser, optical fiber splitter, the fiber Raman frequency shifter of being formed by single-mode fiber and 1660nm light filter, time delay optical fiber, optical fiber wave multiplexer, optical fibre wavelength division multiplexer, sensor fibre, the optical fiber narrow band reflective filter, photoelectricity receiver module, digital signal processor and industrial computer.Fiber pulse laser sends laser pulse and is divided into two bundles by optical fiber splitter, wherein the laser of a branch of 1550nm wave band enters the fiber Raman frequency shifter, through frequency displacement 13.2THz to the 1660nm wave band as wide spectrographic detection light source, output port through the optical fiber wave multiplexer enters optical fibre wavelength division multiplexer, the laser of another bundle 1550nm wave band is as pump light source, through time delay optical fiber, output port by the optical fiber wave multiplexer enters optical fibre wavelength division multiplexer, optical fibre wavelength division multiplexer has four ports, its input port links to each other with another bundle 1550nm pump light source with the probe source of fiber Raman frequency shifter output by optical fiber wave multiplexer 15, the COM output port links to each other with sensor fibre, the reverse Rayleigh scattering light of 1660nm wide waveband spectrum that produces the Raman amplification in sensor fibre links to each other with an input port of photoelectricity receiver module through an output port of optical fibre wavelength division multiplexer, a port of supplied with digital signal processor after opto-electronic conversion is amplified; The reverse anti-Stokes Raman diffused light of 1550nm wide waveband spectrum that produces the Raman amplification in sensor fibre links to each other with the optical fiber narrow band reflective filter through another output port warp of optical fibre wavelength division multiplexer, link to each other with another input port of photoelectricity receiver module behind the 1550nm Rayleigh scattering light of deduction laser, another port of supplied with digital signal processor after opto-electronic conversion is amplified, digital signal processor links to each other with industrial computer.After digital signal processor and industrial computer demodulation, obtain temperature and the strain information of sensor fibre each point.
Among the present invention, the centre wavelength of said pulsed laser is 1550nm, and spectral width is 0.2nm, and laser pulse width is that 10-30ns is adjustable, and peak power is that 1-100W is adjustable, and repetition frequency is that 500Hz-1.5KHz is adjustable.
Among the present invention, the centre wavelength of 1660nm light filter is 1660nm in the said fiber Raman frequency shifter, spectral bandwidth 28nm, transmitance 98% is to the isolation of 1550nm laser〉45dB.
Among the present invention, the branching ratio of said optical fiber splitter is 80/20, and the branching ratio of optical fiber wave multiplexer (15) is 60/40.
Among the present invention, said time delay optical fiber length L is 1.020km〉L〉1km G652 communication unit mode fiber.
Among the present invention, wavelength is 1550nm centered by the centre wavelength of said optical fiber narrowband reflection filter, and spectral width is 0.5nm, and reflectivity 99% is to the isolation of 1550nm laser〉45dB.
Among the present invention, said sensor fibre is that length is G652 communication unit mode fiber or the LEAF optical fiber of 60km.Sensor fibre be transmission medium be again sensor information, it is not charged to be laid on the thermometric scene, anti-electromagnetic interference (EMI), radiation hardness, corrosion-resistant.
Among the present invention, wavelength is 1550nm centered by the centre wavelength of said optical fiber narrowband reflection filter, and spectral width is 0.5nm, and reflectivity 99% is to the isolation of 1550nm laser〉45dB.
During work, fiber pulse laser sends laser pulse and is divided into two bundles by optical fiber splitter, wherein the laser of a branch of 1550nm wave band enters the fiber Raman frequency shifter, through frequency displacement 13.2THz to the 1660nm wave band as wide spectrographic detection light source, output port through the optical fiber wave multiplexer enters optical fibre wavelength division multiplexer, the laser of another bundle 1550nm wave band is as pump light source, through time delay optical fiber, output port by the optical fiber wave multiplexer enters optical fibre wavelength division multiplexer, the COM output port of optical fibre wavelength division multiplexer links to each other with sensor fibre, the reverse Rayleigh scattering light of 1660nm wide waveband spectrum that produces the Raman amplification in sensor fibre links to each other with an input port of photoelectricity receiver module through an output port of optical fibre wavelength division multiplexer, a port of supplied with digital signal processor after opto-electronic conversion is amplified; The reverse anti-Stokes Raman diffused light of 1550nm wide waveband spectrum that produces the Raman amplification in sensor fibre links to each other with the optical fiber narrow band reflective filter through another output port of optical fibre wavelength division multiplexer, behind the deduction 1550nm laser Rayleigh scattering light, link to each other with another input port of photoelectricity receiver module, another port of supplied with digital signal processor after opto-electronic conversion is amplified, digital signal processor links to each other with industrial computer.After digital signal processor and industrial computer demodulation, obtain temperature and the strain information of sensor fibre each point.Temperature measurement accuracy ± 2oC carries out on-line temperature monitoring in the 0oC-300oC scope, carry out the telecommunication network transmission by industrial computer by communication interface, communications protocol.
Merge the Raman enlarge-effect the fiber Raman frequency shifter principle of work:
The fiber Raman frequency shifter is made up of single-mode fiber and broadband 1660nm light filter.Dang Yi Bouquet 1550nm pulse laser incides single-mode fiber, the nonlinear interaction of laser and optical fiber molecule, incident photon is become another Stokes photon or anti-Stokes photon by an optical fiber molecular scattering, corresponding molecule is finished two transition between the vibrational state, emit a phonon and be called the Stokes Raman scattering photon, the phonon frequency of optical fiber molecule is 13.2THz, in sensor fibre, produced the 1660nm Stokes Raman light of frequency displacement 13.2THz, after the 1550nm of incident laser power reaches certain threshold value, most of incident light is converted into the Stokes Raman light, when another bundle 1550nm laser and 1660nm Stokes Raman light of being told by the incident laser source incide same sensor fibre, two-beam produces nonlinear interaction at the sensor fibre place of meeting, after incident power reaches certain value, produce the Stokes Raman diffused light that amplifies, obtained to merge the wide band 1660nm wave band of laser of Raman enlarge-effect, light source as full distribution optical fiber sensor, about 17dB that gains is equivalent to prolong sensing length 40km.
The principle of fully distributed fiber sensor measurement deformation:
Fiber pulse laser sends laser pulse and injects sensor fibre by the integrated-type optical fibre wavelength division multiplexer, the interaction of laser and optical fiber molecule, produce the Rayleigh scattering light with the incident photon same frequency, Rayleigh scattering light transmits in optical fiber and has loss, the exponential decay along with fiber lengths, the light intensity of the reverse Rayleigh scattering light of optical fiber is represented with following formula:
In the following formula
For inciding the light intensity at optical fiber place,
LBe fiber lengths,
IFor reverse Rayleigh scattering light at fiber lengths
LThe light intensity at place,
Fiber transmission attenuation for the incident light wave strong point.
Because sensor fibre is laid on the scene of detection, when site environment produces deformation or crackle, cause the optical fiber at the scene of being laid on to bend, optical fiber produces local loss, forms the added losses of optical fiber
, total losses then
, the light intensity at local place has one to fall, light intensity by
Be reduced to
, the added losses that deformation causes are measured by the change of light intensity.
The relation of deformation or crackle size and fibre loss adopts realistic model to calculate and carries out the simulation test measurement in the laboratory and obtains.
The principle of fully distributed fiber sensor measurement temperature:
When incident laser and optical fiber molecule generation nonlinear interaction scattering, emit a phonon and be called the Stokes Raman scattering photon, absorb a phonon and be called the anti-Stokes Raman scattering photon, the phonon frequency of optical fiber molecule is 13.2THz.Boltzmann (Boltzmann) law is obeyed in population heat distribution on the optical fiber molecular entergy level, and anti-Stokes Raman scattering light intensity dorsad is in optical fiber:
； （3）
It is subjected to the modulation of fiber optic temperature, the temperature modulation function
R a :
H is Bo Langke (Planck) constant, and Δ ν is the phonon frequency of an optical fiber molecule, is 13.2THz, and k is Boltzmann constant, and T is Kai Erwen (Kelvin) absolute temperature.
Adopt the fiber Rayleigh passage to do reference signal in the present invention, come detected temperatures with the ratio of the sharp light intensity of anti-Stokes Raman diffused light and auspicious scattered light:
By anti-Stokes Raman diffused light and the auspicious scattered light sharp light strength ratio of fiber Raman optical time domain reflection (OTDR) curve at the optical fiber check point, the influence of deduction strain obtains the temperature information of each section of optical fiber.
The invention has the beneficial effects as follows that cost of the present invention is low, signal to noise ratio (S/N ratio) good, stability and good reliability; Be applicable to pipelines and petrochemical pipelines in long-range 60 kilometer range, tunnel, large scale civil engineering monitoring and hazard forecasting monitoring.
Description of drawings
Fig. 1 is the synoptic diagram of full distribution optical fiber sensor that merges the fiber Raman frequency shifter of Raman enlarge-effect;
Among the figure, fiber pulse laser 10, optical fiber splitter 11, single-mode fiber 12,1660nm light filter 13, time delay optical fiber 14, optical fiber wave multiplexer 15, optical fibre wavelength division multiplexer 16, sensor fibre 17, optical fiber narrow band reflective filter 18, photoelectricity receiver module 19, digital signal processor 20, industrial computer 21.
Embodiment
Below in conjunction with accompanying drawing the present invention is done to describe further.
With reference to Fig. 1, the full distribution optical fiber sensor that the fiber Raman frequency shifter of Raman enlarge-effect is merged in the present invention comprises: fiber pulse laser 10, optical fiber splitter 11, single-mode fiber 12,1660nm light filter 13, time delay optical fiber 14, optical fiber wave multiplexer 15, optical fibre wavelength division multiplexer 16, sensor fibre 17, optical fiber narrow band reflective filter 18, photoelectricity receiver module 19, digital signal processor 20 and industrial computer 21.Wherein, the fiber Raman frequency shifter that single-mode fiber 12 and 1660nm light filter 13 are formed, fiber pulse laser 10 sends laser pulse and is divided into two bundles by optical fiber splitter 11, wherein the laser of a branch of 1550nm wave band enters the fiber Raman frequency shifter, through frequency displacement 13.2THz to the 1660nm wave band as wide spectrographic detection light source, output port through optical fiber wave multiplexer 15 enters optical fibre wavelength division multiplexer 16, the laser of another bundle 1550nm wave band is as pump light source, through time delay optical fiber 14, output port by optical fiber wave multiplexer 15 enters optical fibre wavelength division multiplexer 16, optical fibre wavelength division multiplexer 16 has four ports, its input port links to each other with another bundle 1550nm pump light source with the wide spectrographic detection light source of fiber Raman frequency shifter output by optical fiber wave multiplexer 15, the COM output port links to each other with sensor fibre 17, the reverse Rayleigh scattering light of 1660nm wide waveband spectrum that produces the Raman amplification in sensor fibre 17 links to each other with an input port of photoelectricity receiver module 19 through an output port of optical fibre wavelength division multiplexer 16, a port of supplied with digital signal processor 20 after opto-electronic conversion is amplified; The reverse anti-Stokes Raman diffused light of 1550nm wide waveband spectrum that produces the Raman amplification in sensor fibre 17 links to each other with optical fiber narrow band reflective filter 18 through another output port of optical fibre wavelength division multiplexer 16, link to each other with another input port of photoelectricity receiver module 19 behind the deduction 1550nm laser Rayleigh scattering light, another port of supplied with digital signal processor 20 after opto-electronic conversion is amplified, digital signal processor 20 links to each other with industrial computer 21.
The centre wavelength of above-mentioned pulsed laser is 1550nm, and spectral width is 0.1nm, and laser pulse width is that 10-30ns is adjustable, and peak power is that 1-100W is adjustable, and repetition frequency is that 500Hz-1.5KHz is adjustable.
The centre wavelength of 1660nm light filter is 1660nm in the above-mentioned fiber Raman frequency shifter, spectral bandwidth 28nm, transmitance 98% is to the isolation of 1550nm laser〉45dB.
The branching ratio of above-mentioned optical fiber splitter is 80/20, and the branching ratio of optical fiber wave multiplexer is 60/40.
Above-mentioned time delay optical fiber length L is 1.020km〉L〉1km G652 communication unit mode fiber.
Sensor fibre is that length is G652 communication unit mode fiber or the LEAF optical fiber of 60km.Sensor fibre be transmission medium be again sensor information, it is not charged to be laid on the thermometric scene, anti-electromagnetic interference (EMI), radiation hardness, corrosion-resistant.
The centre wavelength of above-mentioned optical fiber narrowband reflection filter is 1550nm, and spectral width is 0.5nm, and reflectivity 99% is to the isolation of 1550nm laser〉45dB.
But the above-mentioned digital signal processor Bian binary channels 100MHz bandwidth of Hangzhou OE Technology Co., Ltd., the HZOE-SP01 type signal processing card of 250MS/s Bian collection rate.
Claims (7)
1. full distribution optical fiber sensor that merges the fiber Raman frequency shifter of Raman enlarge-effect, it is characterized in that it comprises: fiber pulse laser (10), optical fiber splitter (11), fiber Raman frequency shifter, time delay optical fiber (14), optical fiber wave multiplexer (15), optical fibre wavelength division multiplexer (16), sensor fibre (17), optical fiber narrow band reflective filter (18), photoelectricity receiver module (19), digital signal processor (20) and the industrial computer (21) formed by single-mode fiber (12) and 1660nm light filter (13); Wherein, fiber pulse laser (10) sends laser pulse and is divided into two bundles by optical fiber splitter (11), wherein the laser of a branch of 1550nm wave band enters the fiber Raman frequency shifter, through frequency displacement 13.2THz to the 1660nm wave band, as wide spectrographic detection light source, output port through optical fiber wave multiplexer (15) enters optical fibre wavelength division multiplexer (16), the laser of another bundle 1550nm wave band is as pump light source, through time delay optical fiber (14), output port by optical fiber wave multiplexer (15) enters optical fibre wavelength division multiplexer (16), optical fibre wavelength division multiplexer (16) has four ports, its input port links to each other with another bundle 1550nm pump light source with the probe source of fiber Raman frequency shifter output by optical fiber wave multiplexer (15), the COM output port of optical fibre wavelength division multiplexer (16) links to each other with sensor fibre (17), two-beam produces the Raman amplification at sensor fibre (17) place of meeting the reverse Rayleigh scattering light of 1660nm wide waveband spectrum links to each other with an input port of photoelectricity receiver module (19) through an output port of optical fibre wavelength division multiplexer (16), a port of supplied with digital signal processor (20) after opto-electronic conversion is amplified; The reverse anti-Stokes Raman diffused light of 1550nm wide waveband spectrum that produces the Raman amplification in sensor fibre (17) links to each other with optical fiber narrow band reflective filter (18) through another output port of optical fibre wavelength division multiplexer (16), link to each other with another input port of photoelectricity receiver module (19) behind the Rayleigh scattering light of deduction 1550nm laser, another port of supplied with digital signal processor (20) after opto-electronic conversion is amplified, digital signal processor (20) links to each other with industrial computer (21).
2. the full distribution optical fiber sensor of the fiber Raman frequency shifter of fusion Raman enlarge-effect according to claim 1, it is characterized in that, the centre wavelength of described pulsed laser (10) is 1550.0nm, spectral width is 0.2nm, laser pulse width is that 10-30ns is adjustable, peak power is that 1-100W is adjustable, and repetition frequency is that 500Hz-1.5KHz is adjustable.
3. the full distribution optical fiber sensor of the fiber Raman frequency shifter of fusion Raman enlarge-effect according to claim 1, it is characterized in that, the centre wavelength of 1660nm light filter (13) is 1660nm in the described fiber Raman frequency shifter, spectral bandwidth 28nm, transmitance 98% is to the isolation of 1550nm laser〉45dB.
4. the full distribution optical fiber sensor of the fiber Raman frequency shifter of fusion Raman enlarge-effect according to claim 1 is characterized in that, the branching ratio of described optical fiber splitter (11) is 80/20, and the branching ratio of optical fiber wave multiplexer (15) is 60/40.
5. the full distribution optical fiber sensor of the fiber Raman frequency shifter of fusion Raman enlarge-effect according to claim 1 is characterized in that, described time delay optical fiber (14) is that length L is the G652 communication unit mode fiber of 1-1.020km.
6. the full distribution optical fiber sensor of the fiber Raman frequency shifter of fusion Raman enlarge-effect according to claim 1 is characterized in that, described sensor fibre (17) is that length is G652 communication unit mode fiber or the LEAF optical fiber of 60km.
7. the full distribution optical fiber sensor of the fiber Raman frequency shifter of fusion Raman enlarge-effect according to claim 1, it is characterized in that, wavelength is 1550nm centered by the centre wavelength of described optical fiber narrow band reflective filter (18), spectral width is 0.5nm, reflectivity 99% is to the isolation of 1550nm laser〉45dB.
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| CN2012100388272A CN102564642B (en) | 2012-02-21 | 2012-02-21 | Fully-distributed optical fiber sensor for optical fiber Raman frequency shifter fused with Raman amplification effect |
| PCT/CN2012/071484 WO2013123656A1 (en) | 2012-02-21 | 2012-02-23 | Fully distributed optical fiber sensor for optical fiber raman frequency shifter of fused raman amplification effect |
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| JP5761235B2 (en) * | 2013-03-06 | 2015-08-12 | 横河電機株式会社 | Optical fiber temperature distribution measuring device |
| GB201601060D0 (en) * | 2016-01-20 | 2016-03-02 | Fotech Solutions Ltd | Distributed optical fibre sensors |
| US10634553B1 (en) * | 2019-01-30 | 2020-04-28 | Saudi Arabian Oil Company | Hybrid distributed acoustic testing |
| US12019200B2 (en) | 2019-03-12 | 2024-06-25 | Saudi Arabian Oil Company | Downhole monitoring using few-mode optical fiber based distributed acoustic sensing |
| CN110456410B (en) * | 2019-08-28 | 2021-10-26 | 之江实验室 | Distributed hydrophone based on superstrong bending resistance multicore optical fiber flexible optical cable |
| CN114184302B (en) * | 2021-12-01 | 2024-04-05 | 山东微感光电子有限公司 | Distributed optical fiber temperature measuring device, photovoltaic panel temperature measuring system and method |
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| US5917969A (en) * | 1998-02-17 | 1999-06-29 | Polaroid Corporation | Laser modulator |
| CN102322886A (en) * | 2011-08-09 | 2012-01-18 | 中国计量学院 | Pulse coding extra-long distance fully-distributed fiber Rayleigh and Raman scattering sensor of fusion fiber Raman frequency shift device |
| CN202453115U (en) * | 2012-02-21 | 2012-09-26 | 中国计量学院 | Full-distribution optical fiber sensor for optical fiber Raman frequency shifter with Raman amplification effect |
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| GB2147758B (en) * | 1983-08-24 | 1987-08-05 | Plessey Co Plc | Optical detecting and/or measuring |
| JP3095694B2 (en) * | 1996-09-13 | 2000-10-10 | 安藤電気株式会社 | Optical fiber strain measurement device |
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| CN102564642A (en) | 2012-07-11 |
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