CN102564642A - 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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- G—PHYSICS
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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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- G01—MEASURING; TESTING
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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 the fiber raman scattering luminous intensity 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 in real time the orientation of forecast field temperature and variations in temperature; The variation of on-line monitoring scene temperature; Temperature range certain is provided with alarm temperature, is a kind of line-type heat detector of essential safe type, is successfully used in fields such as power industry, petroleum chemical enterprise, large scale civil engineering and online disaster monitorings by the on-line monitoring sensing net that distributed optical fiber Raman temperature sensor is formed.
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 deficiency, a kind of full distribution optical fiber sensor that merges the fiber Raman frequency shifter of Raman enlarge-effect is provided to prior art.
The objective of the invention is to realize that through following technical scheme 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 is by the fiber Raman frequency shifter that single-mode fiber and 1660nm light filter are formed, time delay optical fiber; The 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 through optical fiber splitter; The laser of wherein a branch of 1550nm wave band gets into 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 gets into optical fibre wavelength division multiplexer, and the laser of another bundle 1550nm wave band is as pump light source, through time delay optical fiber; Output port through the optical fiber wave multiplexer gets into optical fibre wavelength division multiplexer; Optical fibre wavelength division multiplexer has four ports, and its input port links to each other with another bundle 1550nm pump light source with the probe source of fiber Raman frequency shifter output through optical fiber wave multiplexer 15, and the COM output port links to each other with sensor fibre; The reverse Rayleigh scattering light of 1660nm wide waveband spectrum that in sensor fibre, produces the Raman amplification 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 in sensor fibre, produces the Raman amplification 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 the 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, the centre wavelength of said optical fiber narrowband reflection filter is that centre wavelength is 1550nm, 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, the centre wavelength of said optical fiber narrowband reflection filter is that centre wavelength is 1550nm, 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 through optical fiber splitter; The laser of wherein a branch of 1550nm wave band gets into the fiber Raman frequency shifter, through frequency displacement 13.2THz to the 1660nm wave band as wide spectrographic detection light source, through the output port entering optical fibre wavelength division multiplexer of optical fiber wave multiplexer; The laser of another bundle 1550nm wave band is as pump light source; Through time delay optical fiber, through the output port entering optical fibre wavelength division multiplexer of optical fiber wave 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 in sensor fibre, produces the Raman amplification 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 in sensor fibre, produces the Raman amplification 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 the 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 through 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.When a laser pulse incident on Bouquet 1550nm single-mode fiber, laser and fiber nonlinear interaction of molecules, the incident photon scattering by an optical fiber to another molecule Stokes photons or anti-Stokes photon, the corresponding molecular completed two transitions between two vibrational emit a phonon called Stokes Raman scattered photons, phonons fiber molecules frequency 13.2THz, the sensing fiber produced a frequency shift in the 1660nm Stokes 13.2THz Raman, 1550nm when the incident laser power reaches a certain threshold, the majority of the incident light into Stokes Raman light source when separated from the incident laser beam to another 1550nm Stokes Raman laser with 1660nm Light incident on a sensing fiber to the same, the two beams of light generated at the sensing fiber nonlinear interaction meet the input power reaches a certain value, the resulting amplified Stokes Raman scattered light to obtain the Raman fusion amplification wide spectral band 1660nm wavelength laser as the light source of fully distributed fiber optic sensors, the gain of about 17dB, equivalent to extended sensing length 40km.
The principle of fully distributed fiber sensor measurement deformation:
Fiber pulse laser sends laser pulse and injects sensor fibre through the integrated-type optical fibre wavelength division multiplexer; The interaction of laser and optical fiber molecule; Produce 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, and 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; Form the added losses
of optical fiber; Total losses
then; The light intensity at local place has one to fall; Light intensity is reduced to
by
, and the added losses that deformation causes are measured through 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:
It receives 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 a 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 of single-mode fiber 12 and 1660nm light filter 13 compositions; Fiber pulse laser 10 sends laser pulse and is divided into two bundles through optical fiber splitter 11; The laser of wherein a branch of 1550nm wave band gets into the fiber Raman frequency shifter, through frequency displacement 13.2THz to the 1660nm wave band as wide spectrographic detection light source, through the output port entering optical fibre wavelength division multiplexer 16 of optical fiber wave multiplexer 15; The laser of another bundle 1550nm wave band is as pump light source; Through time delay optical fiber 14, through the output port entering optical fibre wavelength division multiplexer 16 of optical fiber wave multiplexer 15, 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 through optical fiber wave multiplexer 15; The COM output port links to each other with sensor fibre 17, and the reverse Rayleigh scattering light of 1660nm wide waveband spectrum that in sensor fibre 17, produces the Raman amplification 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 in sensor fibre 17, produces the Raman amplification 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.
The digital signal processor may preclude the use of Optoelectronic Technology Co., Ltd. Hangzhou Yi Ou dual channel bandwidth of 100MHz, 250MS / s preclude the collection rate HZOE-SP01 type signal processing card.
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) etc. 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 through optical fiber splitter (11); The laser of wherein a branch of 1550nm wave band gets into the fiber Raman frequency shifter; To the 1660nm wave band,, get into optical fibre wavelength division multiplexer (16) through frequency displacement 13.2THz through the output port of optical fiber wave multiplexer (15) as wide spectrographic detection light source; The laser of another bundle 1550nm wave band is as pump light source; Through time delay optical fiber (14), through the output port entering optical fibre wavelength division multiplexer (16) of optical fiber wave multiplexer (15), 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 through optical fiber wave multiplexer (15); The COM output port links to each other with sensor fibre (17), and 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 in sensor fibre (17), produces the Raman amplification 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 said pulsed laser (10) is 1550.0nm, and spectral width is 0.2nm, and 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 said 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 said 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, said 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, said 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; The centre wavelength of said optical fiber narrow band reflective filter (18) is that centre wavelength is 1550nm; Spectral width is 0.5nm, and 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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| US20140254629A1 (en) * | 2013-03-06 | 2014-09-11 | Yokogawa Electric Corporation | Optical fiber temperature distribution measurement device and method of measuring optical fiber temperature distribution |
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| 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 |
| 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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| GB2147758B (en) * | 1983-08-24 | 1987-08-05 | Plessey Co Plc | Optical detecting and/or measuring |
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| CN102564642B (en) | 2013-08-07 |
| WO2013123656A1 (en) | 2013-08-29 |
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