CN107238415A - For detecting the temperature of fully distributed fiber and the sensor of vibration position - Google Patents
For detecting the temperature of fully distributed fiber and the sensor of vibration position Download PDFInfo
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- 239000000835 fiber Substances 0.000 title claims abstract description 62
- 238000001069 Raman spectroscopy Methods 0.000 claims abstract description 32
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- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
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- 238000002955 isolation Methods 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 9
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 230000035939 shock Effects 0.000 abstract 1
- 239000013307 optical fiber Substances 0.000 description 19
- 238000005516 engineering process Methods 0.000 description 13
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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Abstract
The invention discloses a kind of sensor for being used to detect the temperature and vibration position of fully distributed fiber, using laser, impulse generator, acousto-optic modulator, isolator, EDFA Erbium-Doped Fiber Amplifier, circulator and Raman wavelength division multiplexer send two pulse signals of different sizes to fully distributed fiber, the signal of return passes through Raman wavelength division multiplexer, the gathered data in one of time pulse signal is handled by computer after avalanche diode and data acquisition unit and obtains temperature, return signal passes through Raman wavelength division multiplexer, circulator, after Rayleigh scattering light processing unit and data acquisition unit shock position is obtained by computer in the gathered data handled in another time pulse signal.The present invention can realize monitoring simultaneously to temperature and vibration position over the same fiber, and holistic cost is more much smaller than the individually superposition of two systems, and measurement accuracy is high, measure convenient and swift.
Description
Technical field
In terms of the present invention relates to sensor field, more particularly to the sensor of fully distributed fiber, more specifically to
A kind of sensor for being used to detect the temperature and vibration position of fully distributed fiber.
Background technology
When light is propagated in a fiber, if external environment changes, light some parameters in a fiber can therefore and
Change, such as the light velocity, phase, or even therefore the polarization state of light can also change.By measuring these beche-de-mers without spike in Transmission Fibers
Amount just can obtain corresponding physical quantity, and we are by this technology that sensor is made using optical fiber, referred to as Fibre Optical Sensor skill
Art.
Distributed optical fiber sensing technology, is the matchmaker of optical fiber inherently transmission information using optical fiber as sensing elements
It is situated between, and there is the function of sensing simultaneously again, therefore with the incomparable advantage of traditional electric quantity type sensor.Optical fiber covers
Capping is wide, the change such as the temperature that can be used for measuring in whole sensor fibre coverage and vibration.
Traditional sensor is electric quantity type mostly, and measurement range is small, grid-connected difficulty, and point sensor is big in measurement
Scope, it is necessary to very high maintenance cost when long range.By contrast, the sensor of fibre optical sensor is optical fiber, optical fiber sheet
Body structure stabilization, electromagnetism interference, corrosion-resistant, small volume, cheap, the broad covered area of this infrared optical fiber, can to a wide range of,
The wide system of spatial distribution is measured.Based on above advantage, since distributed optical fiber sensing and late 1970s, obtain
Extensive development, occurs in that what is reflected based on time domain light, Rayleigh time domain light reflection (OTDR), the reflection of Raman time domain light
(ROTDR), phase sensitive time domain light reflection (Φ-OTDR) etc., is currently based on Raman time domain light reflection (ROTDR) and ten has been divided into
It is ripe.Measurement wherein for vibration also has many methods, in recent years by interference technique and phase sensitive time domain light reflection technology (Φ-
OTDR the vibrating sensing technology) being combined is a kind of study hotspot.
1) light is propagated in a fiber to be influenceed by extraneous factor, and the related physical quantity in this time can change,
Corresponding parameter can be measured using this change.After relevant radiant is modulated, the pulsed light of injection injects sensor fibre
When, if there is vibration to produce on optical fiber, then some physical changes can occur for relevant position on sensor fibre, such as optical fiber is reflected
Rate, length etc., using self-interference technology, when sensor fibre is affected by vibrations, the interference signal meeting exported in interferometer
Change, its perfect restitution can be come out by phase carrier technology, can be with using phase sensitive time domain light reflection technology
The position that positioning vibration in real time occurs.Therefore self-interference technology can in real time be monitored to vibration progress super distributed.
2) Raman time domain light reflection (ROTDR) technology is the injected pulse light into optical fiber, and light is in a fiber in communication process,
Produce the temperature effect of backward Raman scattering spectrum.When incident light quantum produces collision with optical fiber material molecule, bullet is produced
Property collision and inelastic collision.During elastic collision, there is no energy exchange between light quantum and material molecule, the frequency of light quantum is not
Generation is any to be changed, and is shown as Rayleigh scattering light and is kept and incident light identical wavelength；In inelastic collision, occur energy and hand over
Change, light quantum can discharge or absorb phonon, show as producing a longer wavelengths of stokes light and a wavelength is shorter
Anti-Stokes light.Because anti-Stokes light is affected by temperature, comparison is sensitive, and system is used to be made with Stokes optical channel
For reference channel, anti-Stokes optical channel has both ratio to eliminate light signal fluctuation, optical fiber as signalling channel
The non-temperature factors such as bending, realize the collection to temperature information.
But current sensor is usually independent measurement vibration position or independent measurement temperature, as desired gauger two
During individual physical quantity, measured respectively using two sets of independent systems, the instrument so needed it is with high costs.
The content of the invention
The technical problem to be solved in the present invention is, position is vibrated in measurement for the above-mentioned existing sensor based on optical fiber
Put and be respectively adopted during temperature two sets of independent systems measure respectively the technological deficiency with high costs that causes there is provided
For detecting the temperature of fully distributed fiber and the sensor of vibration position.
According to the wherein one side of the present invention, the present invention is for its technical problem of solution there is provided one kind for detecting complete point
The temperature of cloth optical fiber and the sensor of vibration position, comprising：
Laser for producing continuous light；
Impulse generator for producing pulse；
For being modulated using the pulse to the continuous light, the acousto-optic modulator of pulse signal is formed, acousto-optic is adjusted
The input difference connecting laser and the output end of impulse generator of device processed, wherein pulse signal have in a cycle
The first level pulse signal and second electrical level pulse signal that level differs；
For allow the signal that acousto-optic modulator is produced by and isolate the isolator of the signal for being back to acousto-optic modulator,
The input of isolator connects the output end of acousto-optic modulator；
For the EDFA Erbium-Doped Fiber Amplifier being amplified to the signal that isolator is inputted, the input of EDFA Erbium-Doped Fiber Amplifier
Connect the output end of isolator；
Circulator, including input, first port and second port, the input connection EDFA Erbium-Doped Fiber Amplifier of circulator
Output end, first port connection Raman wavelength division multiplexer the 3rd port with export EDFA Erbium-Doped Fiber Amplifier input signal extremely
Raman wavelength division multiplexer, and receive the Rayleigh scattering light that Raman wavelength division multiplexer is sent, second port connection Rayleigh scattering light
Processing unit by the Rayleigh scattering light to be sent to Rayleigh scattering light processing unit；
Raman wavelength division multiplexer, including the 3rd port, the 4th port, fifth port and the 6th port, the 4th end
Mouthful it is used for the signal for connecting fully distributed fiber to export circulator input to fully distributed fiber, and gathers fully distributed fiber
The Raman diffused light of return and the Rayleigh scattering light, fifth port and the 6th port are respectively used to extract to be dissipated from the Raman
Penetrate in light and extract anti-Stokes light and stokes light；
Avalanche diode, connects the fifth port and the 6th port with instead by stokes light and stoke respectively
This light is converted to electric signal；
For the Rayleigh scattering light to be converted into delay light and modulation light, the two is interfered, and will be believed after interference
Number be converted to the Rayleigh scattering light processing unit of electric signal；
Data acquisition unit, respectively connect avalanche diode output end and Rayleigh scattering light processing unit output end with
The electric signal of avalanche diode and the electric signal of Rayleigh scattering light processing unit are obtained respectively and are transmitted to centre
Unit is managed, wherein, the avalanche diode that central processing unit controls data acquisition unit is gathered in the first level pulse signal
Electric signal and the electric signal that Rayleigh scattering light processing unit is gathered in second electrical level pulse signal, to be obtained respectively after being handled
Take the temperature and vibration position of fully distributed fiber.
Further, in the sensor of the of the invention temperature and vibration position that are used to detect fully distributed fiber, center
Processing unit connection impulse generator obtains the pulse to be believed with the synchronous first level pulse signal and second electrical level pulse
Number.
Further, in the sensor of the of the invention temperature and vibration position that are used to detect fully distributed fiber, Rayleigh
Scattered light processing unit includes：
For the Rayleigh scattering light to be divided into two, the coupling of the first Rayleigh scattering light and the second Rayleigh scattering light is formed
Device, coupler connects the second interface of the circulator to obtain the Rayleigh scattering light；
Phase carrier signal modulator for producing phase carrier signal；
Piezoelectric ceramic piece, connects the phase carrier signal modulator, with auspicious by described second using phase carrier signal
Sharp scattered light is modulated into the signal with certain frequency；
Two faraday's speculums, the second Rayleigh scattering light reflected respectively after the first Rayleigh scattering light and modulation to institute
Coupler is stated, to be interfered in the coupler；
Signal after interference is converted to the photoelectric detector of electric signal, the input of photoelectric detector connects the coupling
Device, the input of photoelectric detector connects the data acquisition unit.
Further, in the sensor of the of the invention temperature and vibration position that are used to detect fully distributed fiber, laser
The operation wavelength of device is 1550.12nm, and line width is 10kHz.
Further, in the sensor of the of the invention temperature and vibration position that are used to detect fully distributed fiber, annular
Device be also associated with one be used for eliminate bring the bragg grating of spontaneous emission noise in circulator into by EDFA Erbium-Doped Fiber Amplifier.
Further, in the sensor of the of the invention temperature and vibration position that are used to detect fully distributed fiber, Bradley
The a width of 3dB of band of lattice fiber grating, reflectivity is 99%.
Further, in the sensor of the of the invention temperature and vibration position that are used to detect fully distributed fiber, the 5th
Port and the 6th port, which are respectively two that centre wavelength is 1450nm and 1663nm, has the filtering port of certain wavelength bandwidth.
Further, in the sensor of the of the invention temperature and vibration position that are used to detect fully distributed fiber, first
The width of level pulse signal is 50ns, the μ s of pulse spacing 20, and size is 800mv；The width of the second electrical level pulse signal
For 50ns, the μ s of pulse spacing 20, size is 800mv, and size is 420mv.
Further, in the sensor of the of the invention temperature and vibration position that are used to detect fully distributed fiber, center
Processing unit is computer.
The present invention be used for detect fully distributed fiber temperature and vibration position sensor, combine interference technique,
Phase sensitive time domain light reflects and Raman time domain light reflection technology, while being passed using the vibration for combining interference and Φ-OTDR technique
Sense technology and ROTDR temperature sensor technologies, can be realized simultaneously to temperature and the monitoring of vibration over the same fiber, overall
Cost is more much smaller than the individually superposition of two systems, and measurement accuracy is high, measures convenient and swift.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is the temperature for being used to detect fully distributed fiber of the present invention and the sensor original when in use of vibration position
Reason figure.
Embodiment
In order to which technical characteristic, purpose and effect to the present invention are more clearly understood from, now compare accompanying drawing and describe in detail
The embodiment of the present invention.
As shown in figure 1, its for the present invention be used for detect that the temperature of fully distributed fiber and the sensor of vibration position exist
Schematic diagram when using.Include in the sensor described in the present embodiment：Laser 1, acousto-optic modulator 2, isolator 3, mix bait
Fiber amplifier 4, bragg grating 5, circulator 6, Raman wavelength division multiplexer 7, avalanche diode 8, data acquisition unit 10,
Impulse generator 17 and Rayleigh scattering light processing unit 19, Rayleigh scattering light processing unit 19 include：Phase carrier signal is adjusted
Device 11 processed, photodetector 12, piezoelectric ceramic piece 13, coupler 14, faraday's speculum 15, faraday's speculum 16.
The output end and the output end of impulse generator 2 of the input difference connecting laser 1 of acousto-optic modulator 2, every
Input from device 3 connects the output end of acousto-optic modulator 2, and the input of EDFA Erbium-Doped Fiber Amplifier 4 connects the output of isolator 3
End, circulator 6 includes input (in figure at the left side line of circulator 6), first port (the right line of circulator 6 in figure
Place) and second port (in figure at the lower section line of circulator 6), the input connection EDFA Erbium-Doped Fiber Amplifier 4 of circulator 6 it is defeated
Go out end, the 3rd port of first port connection Raman wavelength division multiplexer 7, second port connection Rayleigh scattering light processing unit 19 connects
Connect the input of coupler 14, Raman wavelength division multiplexer 7 includes above-mentioned a 3rd port (left side for Raman wavelength division multiplexer 7 in figure
At the line of side), the 4th port (in figure at the right line of Raman wavelength division multiplexer 7), fifth port and the 6th port be (in figure
At following left and right two lines of Raman wavelength division multiplexer 7), the 4th port connection fully distributed fiber 18, fifth port with
And the 6th port be respectively connecting to the input of avalanche diode 8, the output end of avalanche diode 8 is connected to data acquisition unit
10, two output ends of coupler 14 are respectively connecting to faraday's speculum 15 and faraday's speculum 16, wherein coupler 14
The device that is connected with faraday's speculum 16 of one of output end on be provided with piezoelectric ceramic piece 13, coupler 14 is also connected with
Photodetector 12, the connection phase carrier signal of piezoelectric ceramic piece 13 modulator 11, photodetector 12 and phase carrier letter
Number modulator 11 is connected with data acquisition unit 10, and computer 19 connects data acquisition unit and impulse generator 17 respectively.
During work, laser 1 produces continuous light, and impulse generator 17 produces pulse, and pulse has electricity in a cycle
Flat first level pulse not of uniform size and second electrical level pulse, the continuous light and impulse generator 17 that laser 1 is produced are produced
Raw pulse input to acousto-optic modulator 2, acousto-optic modulator 2 is modulated using above-mentioned pulse to above-mentioned continuous light, forms arteries and veins
Rush signal.Pulse signal has the first level pulse signal and second electrical level pulse letter that level differs in a cycle
Number.The operation wavelength λ of laser is 1550.12nm, and line width is 10kHz.The laser sent is modulated into height by acousto-optic modulator 2
Low pulse laser, high and low level pulse signal width is 50ns, the μ s of pulse spacing 20, and high level is 800mv, and low level is
420mv.The pulse signal being modulated into is sent to the input of isolator 3, and reaches erbium-doped fiber by the output end of isolator 3
The pulse signal that amplifier 4, wherein isolator 3 allow acousto-optic modulator 2 to produce reaches EDFA Erbium-Doped Fiber Amplifier 4, and isolates and mix
Bait fiber amplifier 4 is back to the signal of acousto-optic modulator 2.After EDFA Erbium-Doped Fiber Amplifier 4 amplifies pulse signal, transmit to ring
The input of shape device 6.
Circulator 6 is by the 3rd port of the pulse signal transmission after amplification to Raman wavelength division multiplexer 7, Raman wavelength-division multiplex
4th port of device 7 sends the pulse signal after amplification to fully distributed fiber 18, and fully distributed fiber 18 is scattered back what is come
Raman scattering signal, by the fifth port and the 6th port of Raman wavelength division multiplexer 7 respectively be isolated by anti-Stokes light and
After stokes light, the analog signal after anti-Stokes light and stokes light is respectively converted into by avalanche diode 8
Electric signal, then incoming data collector 10 is gathered, then can obtain corresponding temperature information by the processing of computer 9；Super distributed
Formula optical fiber 18 is scattered back the Rayleigh scattering light come, the input through the incoming coupler 14 of circulator 6, and then coupler 14 is by one
It is divided into two, is reflected by faraday's speculum 15, faraday's speculum 1516, and interfered in coupler 14, finally
By the incoming photodetector 12 of coupler 14, photodetector 12 is converted into electric signal, number is gathered by data acquisition unit 10
According to transferring to computer disposal, obtain corresponding vibration position.Wherein, light is by 14 → faraday of coupler speculum 15 → coupling
There is certain length difference in device 14, the size of this difference takes with light by 16 → coupler of coupler 14 → faraday speculum 14
Certainly in, W*C/ (2*n), wherein W is the time interval of two low pulse signals, and C is the light velocity in vacuum, and n is optical fiber refraction, by
Cause the transmission time of the two inconsistent in the presence of length difference, therefore the reflected light that coupler 14 is eventually received is delay
Light；Light is provided with piezoelectric ceramic piece 13, phase carrier signal modulator on the device of 14 → faraday of coupler speculum 16
11 produce the phase carrier signal with certain frequency, are modulated and are reflected by 14 → faraday of coupler by piezoelectric ceramic piece 13
The light of mirror 16, therefore the light that the faraday's speculum 16 that eventually receives of coupler 14 reflects is modulation light.Coupler 14 is with being connected
Faraday's speculum 15 and faraday's speculum 16 be the presence of a length difference, the size of this difference depends on, W*C/ (2*
N), wherein W is the time interval of two low pulse signals, and C is the light velocity in vacuum, and n reflects for optical fiber.
The phase carrier signal of phase carrier signal modulator 11 receives the control of computer 9, and control instruction is adopted by data
Storage 10 is forwarded to phase carrier signal modulator 11.In the present embodiment, the fifth port of Raman wavelength division multiplexer 7 and
Six ports, which are respectively two that centre wavelength is 1450nm and 1663nm, has the filtering port of certain wavelength bandwidth, to carry respectively
Take out anti-Stokes light and stokes light.
In the present embodiment, computer 9 is only gathered within the high level pulse period and processing avalanche diode 8 is converted
Electric signal, only gathered within the low level pulse period and the electric signal that converts of processing photodetector 12.Computer 9 connects
Connect impulse generator 17 and obtain pulse, by above-mentioned pulse, computer 9 can learn that this sensor is in the high level pulse time
In section or within the low level pulse period.Because in high level pulse signal, high level can obtain high s/n ratio
Spontaneous Raman scattering signal, but can produce nonlinear effect simultaneously causes vibration position measurement to be difficult to, therefore different
The different signal of processing in level pulse signal time section, it is to avoid interfere.
Embodiments of the invention are described above in conjunction with accompanying drawing, but the invention is not limited in above-mentioned specific
Embodiment, above-mentioned embodiment is only schematical, rather than restricted, one of ordinary skill in the art
Under the enlightenment of the present invention, in the case of present inventive concept and scope of the claimed protection is not departed from, it can also make a lot
Form, these are belonged within the protection of the present invention.
Claims (9)
1. a kind of sensor for being used to detect the temperature and vibration position of fully distributed fiber, it is characterised in that include：
Laser (1) for producing continuous light；
Impulse generator (17) for producing pulse；
For being modulated using the pulse to the continuous light, the acousto-optic modulator (2) of pulse signal, acousto-optic modulation are formed
The output end and the output end of impulse generator (17) of the input difference connecting laser (1) of device (2), wherein pulse signal
There is the first level pulse signal and second electrical level pulse signal that level differs in a cycle；
For allow the signal that acousto-optic modulator (2) is produced by and isolate the isolation of the signal for being back to acousto-optic modulator (2)
Device (3), the output end of the input connection acousto-optic modulator (2) of isolator (3)；
For the EDFA Erbium-Doped Fiber Amplifier (4) being amplified to the signal that isolator (3) is inputted, EDFA Erbium-Doped Fiber Amplifier (4)
The output end of input connection isolator (3)；
Circulator (6), including input, first port and second port, the input connection erbium-doped fiber amplification of circulator (6)
The output end of device (4), first port connects the 3rd port of Raman wavelength division multiplexer (7) to export EDFA Erbium-Doped Fiber Amplifier (4)
The signal of input receives the Rayleigh scattering light that Raman wavelength division multiplexer (7) is sent, second to Raman wavelength division multiplexer (7)
Port connects Rayleigh scattering light processing unit (19) Rayleigh scattering light is sent into Rayleigh scattering light processing unit (19)；
Raman wavelength division multiplexer (7), including the 3rd port, the 4th port, fifth port and the 6th port, the 4th port
For connecting fully distributed fiber with export circulator (6) input signal to fully distributed fiber, and gather full distributed light
Raman diffused light and Rayleigh scattering light that fibre is returned, fifth port and the 6th port are respectively used to extract from the Raman scattering
Anti-Stokes light and stokes light are extracted in light；
Avalanche diode (8), connects the fifth port and the 6th port with by anti-Stokes light and stoke respectively
This light is converted to electric signal；
For the Rayleigh scattering light to be converted into delay light and modulation light, the two is interfered, and signal after interference is turned
It is changed to the Rayleigh scattering light processing unit (19) of electric signal；
Data acquisition unit (10), connects the output end and Rayleigh scattering light processing unit (19) of avalanche diode (8) respectively
Output end with obtain respectively the electric signal of avalanche diode (8) and the electric signal of Rayleigh scattering light processing unit (19) and transmit to
CPU (9), wherein the CPU (9) control data collector is in (10) first level pulse signal
The electric signal of the avalanche diode (8) of collection and the collection Rayleigh scattering light processing unit (19) in second electrical level pulse signal
Electric signal, to obtain the temperature and vibration position of fully distributed fiber after being handled respectively.
2. sensor according to claim 1, it is characterised in that the CPU (9) connects the pulse hair
Raw device (17) obtains the pulse with the synchronous first level pulse signal and second electrical level pulse signal.
3. sensor according to claim 1, it is characterised in that the Rayleigh scattering light processing unit (19) includes：
For the Rayleigh scattering light to be divided into two, the coupler of the first Rayleigh scattering light and the second Rayleigh scattering light is formed
(14), coupler (14) connects the second interface of the circulator (6) to obtain the Rayleigh scattering light；
Phase carrier signal modulator for producing phase carrier signal；
Piezoelectric ceramic piece (13), connects the phase carrier signal modulator, with auspicious by described second using phase carrier signal
Sharp scattered light is modulated into the signal with certain frequency；
Two faraday's speculums, the second Rayleigh scattering light reflected respectively after the first Rayleigh scattering light and modulation to the coupling
Clutch (14), to be interfered in the coupler (14)；
Signal after interference is converted to the photoelectric detector (12) of electric signal, the input of photoelectric detector (12) connects the coupling
Clutch (14), the input of photoelectric detector (12) connects the data acquisition unit (10).
4. sensor according to claim 1, it is characterised in that the operation wavelength of the laser (1) is
1550.12nm, line width is 10kHz.
5. sensor according to claim 1, it is characterised in that the circulator (6) be also associated with one be used for eliminate by
EDFA Erbium-Doped Fiber Amplifier (4) brings the bragg grating (5) of spontaneous emission noise in circulator (6) into.
6. sensor according to claim 5, it is characterised in that a width of 3dB of band of the bragg grating (5),
Reflectivity is 99%.
7. sensor according to claim 1, it is characterised in that ripple centered on the fifth port and the 6th port difference
Two of a length of 1450nm and 1663nm have the filtering port of certain wavelength bandwidth.
8. sensor according to claim 1, it is characterised in that the width of the first level pulse signal is 50ns,
The μ s of pulse spacing 20, size is 800mv；The width of the second electrical level pulse signal is 50ns, the μ s of pulse spacing 20, and size is
800mv, size is 420mv.
9. sensor according to claim 1, it is characterised in that the CPU (9) is computer.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107728403A (en) * | 2017-10-25 | 2018-02-23 | 中国地质大学（武汉） | A kind of 1.55 mu m waveband to 2 mu m wavebands wavelength shifter |
| CN108180978A (en) * | 2018-01-30 | 2018-06-19 | 广州天长通信技术有限公司 | A kind of combination PGC technologies and the method and device of Φ-OTDR technique detection optical fiber vibration |
| CN108519166A (en) * | 2018-03-02 | 2018-09-11 | 武汉理工大学 | A kind of positioning of optical fiber optical grating array intelligent vibration and temperature monitoring system |
| CN108663138A (en) * | 2018-05-16 | 2018-10-16 | 湖北三江航天万峰科技发展有限公司 | A kind of distributed fiber optic temperature and the sensor-based system and method for vibration |
| CN109029773A (en) * | 2018-08-07 | 2018-12-18 | 吉林大学 | A kind of temperature-sensing system for mining safety monitoring |
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| CN113721287A (en) * | 2021-07-16 | 2021-11-30 | 西北大学 | Monitoring method and device based on sensing optical fiber |
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| CN116086546A (en) * | 2023-03-07 | 2023-05-09 | 中北大学 | Device and method for real-time in-situ simultaneous measurement of temperature and mechanical parameters |
| CN116086546B (en) * | 2023-03-07 | 2023-06-30 | 中北大学 | Device and method for real-time in-situ simultaneous measurement of temperature and mechanical parameters |
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