CN207636092U - A kind of distributed fiber optic temperature and strain sensing device - Google Patents
A kind of distributed fiber optic temperature and strain sensing device Download PDFInfo
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- CN207636092U CN207636092U CN201721891731.5U CN201721891731U CN207636092U CN 207636092 U CN207636092 U CN 207636092U CN 201721891731 U CN201721891731 U CN 201721891731U CN 207636092 U CN207636092 U CN 207636092U
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Abstract
The utility model discloses a kind of distributed fiber optic temperatures and strain sensing device, including control module, pulsed optical signals generation module, continuous optical signal generation module, detecting module, test optic module and wavelength division multiplexer；Pulsed optical signals generation module is connect with test optic module, and continuous optical signal generation module is connect with test optic module；Pulsed optical signals generation module is connect with continuous optical signal generation module, and pulsed optical signals generation module is also connect by wavelength division multiplexer with detecting module；Control module is connect with pulsed optical signals generation module, continuous optical signal generation module and detecting module respectively, and controls the optical signal transmission between pulsed optical signals generation module, continuous optical signal generation module and detecting module.The utility model can play the technical advantage of BOTDR, BOTDA and DTS, realize quick, single-ended, both-end, to fiber optic temperature and strain while measuring function in high precision.
Description
Technical field
The utility model is related to fibre optical sensor fields, and in particular to a kind of distributed fiber optic temperature and strain sensing dress
It sets.
Background technology
For optical fiber sensing technology using light wave as carrier, optical fiber is medium, the novel biography of perception and the extraneous measured signal of transmission
Sense technology has many advantages, such as measurement sensitivity height, wide dynamic range, electromagnetism interference, corrosion-resistant and compact.Distributed light
Fiber sensor is one kind of fiber optic sensor technology, it as sensing responsive element and transmits signal media simultaneously using optical fiber,
One-shot measurement can obtain the distribution map that information (such as temperature, strain) is measured in entire fiber area, therefore obtain fast
The development and functionization of speed.
At fiber optic temperature, strain measurement field, optical fiber Brillouin optical time-domain analyzer (BOTDA), optical fiber Brillouin light
Domain reflectometer (BOTDR), Raman fiber sensor (DTS) are three kinds of main distributed fiberoptic sensors, and three respectively has excellent lack
Point and the technical solution realized.DTS technologies realize that fiber optic temperature quickly measures by the way of single-ended measurement, but measurement distance
It is limited；Optical fiber Brillouin scattering is all utilized in BOTDR and BOTDA technologies, but test mode is different, and BOTDR technologies measure essence
Degree and distance be not high, but it is simple and practicable by the way of single-ended measurement, even if accidental damage or fracture occur for tested optical fiber,
Nor affect on the normal work of equipment；And BOTDA belongs to double-end measurement, and tested optical fiber is needed to form loop, has very high survey
Accuracy of measurement, but when tested optical fiber is damaged or is broken cannot be formed measure loop when, equipment cannot work.
Utility model content
In view of the deficiencies of the prior art, the purpose of this utility model is intended to provide a kind of distributed fiber optic temperature and strain
Sensing device.
A kind of distributed fiber optic temperature and strain sensing device provided by the utility model, including control module, pulsed light
Signal generator module, continuous optical signal generation module, detecting module, test optic module and wavelength division multiplexer；
Pulsed optical signals generation module is connect with test optic module, continuous optical signal generation module and test optic module
Connection；
Pulsed optical signals generation module is connect with continuous optical signal generation module, and pulsed optical signals generation module also passes through wave
Division multiplexer is connect with detecting module；
Control module is connect with pulsed optical signals generation module, continuous optical signal generation module and detecting module respectively, and
Control the optical signal transmission between pulsed optical signals generation module, continuous optical signal generation module and detecting module.
Preferably, test optic module includes test optical fiber.
Preferably, pulsed optical signals generation module includes first laser device, the first coupler, the first modulator, the first light
Fiber amplifier, first filter, Polarization Controller and three port circulators；First laser device and the input terminal of the first coupler connect
It connects, the first output end of the first coupler is connect with the input terminal of the first modulator, the output end of the first modulator and the first light
The input terminal of fiber amplifier connects, and the output end of the first fiber amplifier and the input terminal of first filter connect, the first filtering
The output end of device and the input terminal of Polarization Controller connect, the first port of the output end of Polarization Controller and three port circulators
The second port of connection, three port circulators is connect with the first port of test optical fiber.
Preferably, detecting module includes the first photoswitch, the first photodetector, the second photodetector, third photoelectricity
Detector, data collector, the second coupler and low-pass filter；First output end of the first photoswitch and the second coupler
First input end connects, and the output end of the first photodetector and the first input end of data collector connect, the first photoswitch
Second output terminal connect with the input terminal of the second photodetector, the output end of the second photodetector and data collector
Second input terminal connects, and the first output end and second output terminal of the second coupler are defeated with the first of third photodetector respectively
Enter end to connect with the second input terminal, the output end of third photodetector and the input terminal of low-pass filter connect, low-pass filtering
The output end of device and the third input terminal of data collector connect.
Preferably, continuous optical signal generation module includes the second modulator, the second fiber amplifier, second filter and the
Two photoswitches；The input terminal of second modulator is connect with the second output terminal of the first coupler, the output end of the second modulator with
The input terminal of second filter connects, and the first output end of the second photoswitch is connect with the second port of test optical fiber, the second light
The second output terminal of switch is connect with the second input terminal of the second coupler.
Preferably, control module includes control unit, control unit respectively with the control signal of the first modulator, first
The control signal of fiber amplifier, the control signal of Polarization Controller, the control signal of the first photoswitch, the second modulation
The control signal of device, the control signal of the second fiber amplifier are connected with the control signal of the second photoswitch, and are controlled
The conducting of control signal.
Preferably, optical filter built in wavelength division multiplexer；Pulsed optical signals generation module also passes through wavelength division multiplexer and detection
Module connects：The input terminal of wavelength division multiplexer is connect with the third port of three port circulators, and the of wavelength division multiplexer
One output end is connect with the input terminal of the first photoswitch, and the second output terminal and third output end of wavelength division multiplexer are respectively with first
The first input end of photodetector and the connection of the second input terminal.
Preferably, further include optical signal analysis device, the output end connection of optical signal analysis device and data collector, to data
The optical signal of collector output is analyzed, and obtains the temperature and strain information of test optical fiber.
Preferably, continuous optical signal generation module includes second laser, third coupler, adjustable attenuators and second
Photoswitch；Second laser is connect with the input terminal of third coupler, the output end of third coupler and adjustable attenuators
Input terminal connects, and the control signal of adjustable attenuators is connect with control unit, the output end of adjustable attenuators and second
The input terminal of photoswitch connects.
Preferably, further include difference on the frequency locking module and the 4th coupler；Difference on the frequency locking module passes through first laser device
It connect with pulsed optical signals generation module, is connect with continuous optical signal generation module by second laser, difference on the frequency locks mould
Block is connect with the 4th coupler, and the 4th coupler is connect by the first coupler with pulsed optical signals generation module.
The advantageous effect of a kind of distributed fiber optic temperature and strain sensing device provided by the utility model is：It is only using
Under the premise of one laser is as light source, BOTDA and BOTDR functions are realized in the switching that photoswitch is controlled by control unit
Switching, and adjust by controlling fiber amplifier the power of input light, realize answering for DTS lasers and BOTDA/R lasers
With, give full play to the technical advantage of BOTDR, BOTDA, DTS, save laser use under the premise of, realize it is single-ended, double
End independently measures function to the temperature strain of optical fiber sensor head in high precision.
Description of the drawings
Fig. 1 is the structure of a kind of distributed fiber optic temperature and strain sensing device that the utility model first embodiment provides
Schematic diagram；
Fig. 2 is the structure of a kind of distributed fiber optic temperature and strain sensing device that the utility model second embodiment provides
Schematic diagram；
Fig. 3 is the structure of a kind of distributed fiber optic temperature and strain sensing device that the utility model 3rd embodiment provides
Schematic diagram.
10, control module；11, control unit；20, pulsed optical signals generation module；21, first laser device；22, the first coupling
Clutch；23, the first modulator；24, the first fiber amplifier；25, first filter；26, Polarization Controller；27, three port ring
Shape device；30, continuous optical signal generation module；31, the second modulator；32, the second fiber amplifier；33, second filter；34、
Second photoswitch；35, second laser；36, third coupler；37, adjustable attenuators；40, detecting module；41, the first light
Switch；42, the first photodetector；43, the second photodetector；44, third photodetector；45, data collector；46、
Second coupler；47, low-pass filter；50, optic module is tested；51, optical fiber is tested；60, wavelength division multiplexer；70, optical signal
Analyzer；80, difference on the frequency locking module；90, the 4th coupler.
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without creative efforts
The every other embodiment obtained, shall fall within the protection scope of the present invention.
First embodiment：
Referring to Fig. 1, a kind of distributed fiber optic temperature and strain sensing device that are provided for the utility model first embodiment
Structural schematic diagram；
A kind of distributed fiber optic temperature and strain sensing device that the utility model first embodiment provides, including control mould
Block 10, pulsed optical signals generation module 20, continuous optical signal generation module 30, detecting module 40, test optic module 50 and wave
Division multiplexer 60；
Pulsed optical signals generation module 20 is connect with test optic module 50, continuous optical signal generation module 30 and test
Optic module 50 connects；
Pulsed optical signals generation module 20 is connect with continuous optical signal generation module 30, and pulsed optical signals generation module 20 is also
It is connect with detecting module 40 by wavelength division multiplexer 60；
Control module 10 respectively with pulsed optical signals generation module 20, continuous optical signal generation module 30 and detecting module 40
Connection, and control the optical signal between pulsed optical signals generation module 20, continuous optical signal generation module 30 and detecting module 40
Transmission.
It should be noted that a kind of distributed fiber optic temperature and strain sensing device that the utility model embodiment provides,
Control module is connect with pulsed optical signals generation module, continuous optical signal generation module and detecting module respectively, and control module can
With control pulsed optical signals generation module generation laser, and control laser continuous optical signal generation module, detecting module and
The different transmission paths of optic module are tested, last detecting module can detect different optical signals, by extracting these
Optical signal and the spectrum for obtaining these optical signals carry out calculating analysis to spectrum, can obtain test optical fiber module temperature and
Strain information.
Second embodiment：
Referring to Fig. 2, a kind of distributed fiber optic temperature and strain sensing device that are provided for the utility model second embodiment
Structural schematic diagram；
Preferably, test optic module 50 includes test optical fiber 51.
Preferably, pulsed optical signals generation module 20 includes first laser device 21, the first coupler 22, the first modulator
23, the first fiber amplifier 24, first filter 25, Polarization Controller 26 and three port circulators 27；First laser device 21 with
The input terminal of first coupler 22 connects, and the first output end of the first coupler 22 is connect with the input terminal of the first modulator 23,
The output end of first modulator 23 is connect with the input terminal of the first fiber amplifier 24, the output end of the first fiber amplifier 24 with
The input terminal of first filter 25 connects, and the output end of first filter 25 is connect with the input terminal of Polarization Controller 26, polarizes
The output end of controller 26 is connect with the first port of three port circulators 27, the second port of three port circulators 27 and survey
Try the first port connection of optical fiber 51.
Preferably, detecting module 40 include the first photoswitch 41, the first photodetector 42, the second photodetector 43,
Third photodetector 44, data collector 45, the second coupler 46 and low-pass filter 47；The first of first photoswitch 41
Output end is connect with the first input end of the second coupler 46, output end and the data collector 45 of the first photodetector 42
First input end connects, and the second output terminal of the first photoswitch 41 is connect with the input terminal of the second photodetector 43, the second light
The output end of electric explorer 43 is connect with the second input terminal of data collector 45, the first output end of the second coupler 46 and
Two output ends are connect with the first input end of third photodetector 44 and the second input terminal respectively, third photodetector 44
Output end connect with the input terminal of low-pass filter 47, the third of the output end and data collector 45 of low-pass filter 47 is defeated
Enter end connection.
Preferably, continuous optical signal generation module 30 includes the second modulator 31, the filtering of the second fiber amplifier 32, second
Device 33 and the second photoswitch 34；The input terminal of second modulator 31 is connect with the second output terminal of the first coupler 22, and second adjusts
The output end of device 31 processed is connect with the input terminal of second filter 33, the first output end and the test optical fiber 51 of the second photoswitch 34
Second port connection, the second output terminal of the second photoswitch 34 connect with the second input terminal of the second coupler 46.
Preferably, control module 10 includes control unit 11, and control unit 11 is defeated with the control of the first modulator 23 respectively
Enter the control at end, the control signal of the first fiber amplifier 24, the control signal of Polarization Controller 26, the first photoswitch 41
Input terminal, the control signal of the second modulator 31, the control signal of the second fiber amplifier 32 and the second photoswitch 34
Control signal connects, and controls the conducting of control signal.
Preferably, further include wavelength division multiplexer 60, optical filter built in wavelength division multiplexer 60；Pulsed optical signals generation module 20
It is also connect with detecting module 40 and is specially：The input terminal of wavelength division multiplexer 60 is connect with the third port of three port circulators 27,
First output end of wavelength division multiplexer 60 is connect with the input terminal of the first photoswitch 41, the second output terminal of wavelength division multiplexer 60 and
Third output end is connect with the first input end of the first photodetector 42 and the second input terminal respectively.
Preferably, further include optical signal analysis device 70, optical signal analysis device 70 is connect with the output end of data collector 45,
The optical signal exported to data collector 45 is analyzed, and obtains the temperature and strain information of test optical fiber 51.
It should be noted that a kind of distributed fiber optic temperature provided by the utility model and strain sensing device, Neng Gourong
BOTDR, BOTDA and DTS technology of conjunction, obtains the spectrum of the very high temperature and strain information with optical fiber of precision, and can be right
It tests the temperature of optical fiber and strain information carries out joint demodulation to respectively obtain temperature, the independent information of strain of test optical fiber.
Below by taking Fig. 2 as an example, specifically describes a kind of distributed fiber optic temperature and strain sensing device provided by the utility model and exist respectively
Operating mode under BOTDR, BOTDA and DTS technology and operation principle：
BOTDR operating modes：
(1) laser that laser is sent out is divided into two-way light after the first coupler and is transmitted, by the first coupler
The first output end output light pulsed light generation module transmit, another way light enter continuous light generation module；Wherein,
Pass through in the first modulator in the laser of pulsed light generation module transmission, the first modulator is by Laser Modulation at pulsed light, modulation
The pulsed light gone out is after the first fiber amplifier, by the first fiber amplifier by the power amplification of pulsed light to being suitable for
The luminous power of BOTDR operating modes detection, then passes through first filter, and first filter is by the amplified pulsed light of luminous power
Pulsed light is input in Polarization Controller after filtering out ASE noises, is input to after the polarization state of Polarization Controller adjustment pulsed light
In three port circulators, there are three ports for three port circulators, after pulsed light enters three port circulators, by three port circulators
The second port being connect with the first port of test optical fiber is input in test optical fiber, when pulsed light transmits in testing optical fiber
When, three kinds of Rayleigh scattering, Brillouin scattering and Raman scattering scattering phenomenons are generated, and generated respectively by these three scattering phenomenons auspicious
Profit scattering light, Brillouin scattering and Raman diffused light, these three scattering light all can reverse transfers, the i.e. arteries and veins into test optical fiber
It washes off and is testing in optical fiber the three kinds of scattering light for generating scattering and being formed, back to the second port of three port circulators, and from
The third port of three port circulators is input to the input terminal of wavelength division multiplexer, and in three output ends of wavelength division multiplexer difference
It is equipped with different optical filters, these optical filters respectively filter Rayleigh scattering light, Brillouin scattering and Raman diffused light respectively
And it is output to different output ends one by one, but the wavelength interval of Rayleigh scattering light and Brillouin scattering is about 11GHz, and
Filter plate can not separate both scattering light, therefore Rayleigh scattering light and Brillouin scattering are all from the first of wavelength division multiplexer
Output end exports, and the interval between the wavelength of Raman diffused light and the wavelength of Rayleigh scattering light and Brillouin scattering is enough to allow
Filter plate detaches Raman diffused light, therefore can be separated Raman diffused light by filter plate, wherein Raman diffused light has
Stokes and anti-Stokes two-way light, this two-way light are defeated from the second output terminal of wavelength division multiplexer and third output end respectively
Go out, and in BOTDR operating modes, only consider the Rayleigh scattering light and the Brillouin that are exported from the first output end of wavelength division multiplexer
Light is scattered, both light are output to the input terminal of the first photoswitch, control unit control from the first output end of wavelength division multiplexer
First output end of the input terminal of the first photoswitch to the first photoswitch is connected, then Rayleigh scattering light and Brillouin scattering are from the
The input terminal of one photoswitch enters the first output end of the first photoswitch, and is output to by the first output end of the first photoswitch
The first input end of second coupler；
(2) continuous light generation module is entered by the light of the first output end of the first coupler output, that is, enters second
The input terminal of modulator, since the driving frequency of the second modulator is about 11GHz, so the road light is obtained by shift frequency about 11GHz
To shift frequency optical signal, after the second fiber amplifier and second filter, shift frequency optical signal is amplified and filters shift frequency optical signal
Wave, and be output in the second photoswitch, control unit controls the input terminal of the second photoswitch to the second output of the second photoswitch
End conducting, therefore shift frequency optical signal is output to the second input terminal of the second coupler from the second photoswitch, therefore in the second coupling
In device, there are the Rayleigh scattering light and Brillouin scattering for entering the second coupler from the first input end of the second coupler, and
Enter the shift frequency optical signal of the second coupler, Rayleigh scattering light and Brillouin scattering point from the second input terminal of the second coupler
It is not interfered with shift frequency optical signal, wherein Rayleigh scattering light and shift frequency optical signal frequency difference are about 11GHz, therefore two kinds of light
It is the high frequency optical signal that a difference on the frequency is 11GHz after interfering, and the frequency phase of Brillouin scattering and shift frequency optical signal
When being the intermediate frequency optical signal of hundreds of MHz after interference, the high frequency optical signal and intermediate frequency optical signal generated after interference is from the second coupling
Clutch enters third photodetector, and after low-pass filter, low-pass filter filters out the high frequency optical signal of 11GHz, because
This is extracted the intermediate frequency optical signal of hundreds of MHz, to realize the extraction to Brillouin scattering, the intermediate frequency light of hundreds of MHz of extraction
Signal, which enters, realizes AD conversion in data collector, enter finally into optical signal analysis device, in optical signal analysis device, energy
Access Brillouin's damage curve under current Brillouin's difference on the frequency.
Therefore in BOTDR operating modes, the second modulator can be controlled by control unit to realize different brillouin frequencies
Brillouin's damage curve under rate difference, obtains complete Brillouin's frequency spectrum, then by optical signal analysis device to obtained Brillouin
The center frequency point of Brillouin's frequency spectrum is calculated in spectrum analysis, and then obtains the temperature and strain information of test optical fiber.
BOTDA operating modes：
(1) laser that laser is sent out is divided into two-way light after the first coupler and is transmitted, by the first coupler
The first output end output light pulsed light generation module transmit, another way light enter continuous light generation module；Wherein,
Pass through in the first modulator in the laser of pulsed light generation module transmission, the first modulator is by Laser Modulation at pulsed light, modulation
The pulsed light gone out is after the first fiber amplifier, by the first fiber amplifier by the power amplification of pulsed light to being suitable for
The luminous power of BOTDA operating modes detection, then passes through first filter, and first filter is by the amplified pulsed light of luminous power
Pulsed light is input in three port circulators after filtering out ASE noises, there are three port, pulsed lights to enter three for three port circulators
After the circulator of port, the second port being connect with the first port of test optical fiber by three port circulators is input to test optical fiber
In；
(2) continuous light generation module is entered by the light of the second output terminal of the first coupler output, that is, enters second
The input terminal of modulator, since the driving frequency of the second modulator is about 11GHz, so the road light is obtained by shift frequency about 11GHz
To shift frequency optical signal, after the second fiber amplifier and second filter, shift frequency optical signal is amplified and filters shift frequency optical signal
Wave, and be output in the second photoswitch, control unit controls the input of the first output end to the second photoswitch of the second photoswitch
End conducting, therefore the shift frequency optical signal after being amplified enters the second end of test optical fiber by the first output end of the second photoswitch
Mouthful, and make mutually in testing optical fiber with the pulsed optical signals for entering test optical fiber in (1) from the first port of test optical fiber
With when the difference on the frequency of both optical signals of interaction meets in the range of Brillouin's difference on the frequency, it may occur that energy turns
It moving, the shift frequency optical signal after interacting with pulsed optical signals reaches the second port of three port circulators by testing optical fiber,
Enter in wavelength division multiplexer into three port circulators, and from the third port of three port circulators, passes through wavelength division multiplexer
First output end enters the input terminal of the first photoswitch, and into the first photoswitch, control unit controls the second of the first photoswitch
The input terminal of output end to the first photoswitch is connected, therefore shift frequency optical signal enters the second optical detection by the first photoswitch
Device, shift frequency optical signal realizes the amplification of opto-electronic conversion and signal in the second optical detector, and is output in data collector, number
According to collector to carrying out conversion and amplified shift frequency optical signal into AD conversion, it is finally output in optical signal analysis device, obtains
To Brillouin's damage curve under current Brillouin's difference on the frequency.
Therefore in BOTDA operating modes, control unit is by controlling the second modulator under different Brillouin's difference on the frequencies
Shift frequency optical signal Brillouin's damage curve measure, obtain complete Brillouin's frequency spectrum, then by optical signal analysis device to cloth
In deep frequency spectrum carry out calculating analysis and obtain the center frequency point of Brillouin's frequency spectrum, and then obtain the temperature of test optical fiber and strain is believed
Breath.
DTS operating modes：
After the laser that laser is sent out enters the first coupler, the first modulator.The first amplifier is entered, in DTS works
Operation mode, because the required pulsed lights of luminous power ratio BOTDR and BOTDA of the required pulsed light of DTS operating modes
Luminous power is all big, therefore in DTS operating modes, the gain setting of the first amplifier of control unit pair than above-mentioned BOTDR and
BOTDA high, therefore in the first higher pulsed optical signals of amplifier Output optical power.Pulsed optical signals by first filter and
Entering three port circulators after Polarization Controller, there are three ports for three port circulators, after pulsed light enters three port circulators,
The second port being connect with the first port of test optical fiber by three port circulators is input in test optical fiber, when pulsed light is being surveyed
When being transmitted in examination optical fiber, three kinds of Rayleigh scattering, Brillouin scattering and Raman scattering scattering phenomenons are generated, and it is existing by these three scatterings
As generating Rayleigh scattering light, Brillouin scattering and Raman diffused light respectively, these three scattering light all can reverse transfers, that is, enter
The pulsed light for testing optical fiber generates scattering and three kinds of scattering light being formed in test optical fiber, back to the of three port circulators
Two-port netwerk, and wavelength division multiplexer is entered by the third port of three port circulators, the optical filter of wavelength division multiplexer is by three kinds
Raman diffused light is separated in scattering light, and Raman diffused light has Stokes and anti-Stokes two-way light, passes through wave respectively
The second output terminal and third output end of division multiplexer enter the first photodetector, in the first photodetector, first
Photodetector carries out opto-electronic conversion to Stokes and anti-Stokes two ways of optical signals and signal amplifies, and is output to data
Collector, data collector is AD converted optical signal in data collector, finally by collected stokes light and
Anti-Stokes optical signal is all input to optical signal analysis device, since Raman Stokes optical signal is to temperature-insensitive,
As the reference light for measuring fiber optic temperature, and Raman anti-Stokes optical signal is temperature sensitive, accordingly acts as measuring optical fiber temperature
The signal light of degree, the temperature that optical signal analysis device can obtain test optical fiber using reference light and signal light to calculate analysis are believed
Breath.
To sum up, implement the beneficial effects of the utility model：
A kind of distributed fiber optic temperature and strain sensing device that second embodiment provides are provided by the utility model, it can be with
Control action by control unit to the control signal connected can be realized in BOTDR operating modes and BOTDA work
To Brillouin's damage curve under different Brillouin's difference on the frequencies under pattern, complete Brillouin's frequency spectrum is obtained, then pass through optical signal
The center frequency point of Brillouin's frequency spectrum is calculated to obtained brillouin frequency spectrum analysis in analyzer, and then obtains test optical fiber
Temperature and strain information；Can also realize Raman Stokes optical signal and Raman under DTS operating modes by acquisition it is anti-this
Lentor optical signal, using Raman Stokes optical signal as with reference to light and Raman anti-Stokes optical signal as signal light,
Optical signal analysis device can obtain the temperature information of test optical fiber using reference light and signal light to calculate analysis.It is worked by DTS
The temperature information of the test optical fiber measured under pattern is to the test optical fiber that is obtained under BOTDR operating modes and BOTDA operating modes
Temperature and strain information demodulated, you can obtain test optical fiber strain information, i.e., respectively obtain test optical fiber temperature
Information and strain information.Pair it can be seen that the utility model can in the case where only using a laser as light source, point
Not Shi Xian tri- kinds of operating modes of BOTDR, BOTDA and DTS come obtain test optical fiber temperature information and strain information.
3rd embodiment：
Referring to Fig. 3, a kind of distributed fiber optic temperature and strain sensing device that are provided for the utility model 3rd embodiment
Structural schematic diagram；
Preferably, continuous optical signal generation module 30 includes second laser 35, third coupler 36, adjustable attenuators
37 and second photoswitch 34；Second laser 35 is connect with the input terminal of third coupler 36, the output end of third coupler 36
It is connect with the input terminal of adjustable attenuators 37, the control signal of adjustable attenuators 37 is connect with control unit 11, adjustable
The output end of H-section attenuator H 37 is connect with the input terminal of the second photoswitch 34.
Preferably, further include difference on the frequency locking module 80 and the 4th coupler 90；Difference on the frequency locking module 80 passes through first
Laser 21 is connect with pulsed optical signals generation module 20, is connected by second laser 35 and continuous optical signal generation module 30
It connects, difference on the frequency locking module 80 is connect with the 4th coupler 90, and the 4th coupler 90 is believed by the first coupler 22 with pulsed light
Number generation module 20 connects.
A kind of distributed fiber optic temperature provided by the utility model and strain are explained on the basis of second embodiment below
The 3rd embodiment of sensing device：
Such as Fig. 3, the continuous light generation module of second embodiment is improved, mould is generated by the continuous light of second embodiment
Second modulator, the second fiber amplifier, second filter and the second photoswitch in the block become second laser, third coupling
Device, adjustable attenuators and the second photoswitch, and add additional difference on the frequency locking module and the 4th coupler；
Therefore pulsed optical signals generation module, the course of work of detecting module and wavelength division multiplexer and second embodiment provide
Scheme it is identical, therefore do not repeat.Continuous light generation module is improved, increased second laser is for locking
The difference on the frequency of Brillouin's difference on the frequency when BOTDR and BOTDA operating modes, laser 1 and laser 2 is arranged in 11GHz or so,
It is the demand that basic Brillouin's difference on the frequency is just met for common optical fiber Brillouin frequency difference with 11GHz, and can be by continuously changing
Become laser 1 with 2 difference on the frequency of laser to realize complete brillouin frequency spectrometry, to obtain the temperature of test optical fiber and answer
Become information.
And DTS operating modes are identical as second embodiment.
The above embodiment is only preferred embodiments of the present invention, cannot be protected with this to limit the utility model
Range, the variation of any unsubstantiality that those skilled in the art is done on the basis of the utility model and replacing belongs to
In the utility model range claimed.
Claims (10)
1. a kind of distributed fiber optic temperature and strain sensing device, which is characterized in that generated including control module, pulsed optical signals
Module, continuous optical signal generation module, detecting module, test optic module and wavelength division multiplexer；
The pulsed optical signals generation module is connect with the test optic module, the continuous optical signal generation module with it is described
Test optic module connection；
The pulsed optical signals generation module is connect with the continuous optical signal generation module, the pulsed optical signals generation module
Also it is connect with the detecting module by the wavelength division multiplexer；
The control module respectively with the pulsed optical signals generation module, the continuous optical signal generation module and the detection
Module connect, and control the pulsed optical signals generation module, the continuous optical signal generation module and the detecting module it
Between optical signal transmission.
2. a kind of distributed fiber optic temperature as described in claim 1 and strain sensing device, which is characterized in that the test light
Fiber module includes test optical fiber.
3. a kind of distributed fiber optic temperature as claimed in claim 2 and strain sensing device, which is characterized in that the pulsed light
Signal generator module include first laser device, the first coupler, the first modulator, the first fiber amplifier, first filter, partially
Shake controller and three port circulators；The first laser device is connect with the input terminal of first coupler, first coupling
First output end of clutch is connect with the input terminal of first modulator, the output end of first modulator and described first
The input terminal of fiber amplifier connects, and the output end of first fiber amplifier connects with the input terminal of the first filter
It connects, the output end of the first filter is connect with the input terminal of the Polarization Controller, the output end of the Polarization Controller
It is connect with the first port of three port circulator, the second port of three port circulator and the of the test optical fiber
Single port connects.
4. a kind of distributed fiber optic temperature as claimed in claim 3 and strain sensing device, which is characterized in that the detection mould
Block includes the first photoswitch, the first photodetector, the second photodetector, third photodetector, data collector, second
Coupler and low-pass filter；First output end of first photoswitch and the first input end of second coupler connect
It connects, the output end of first photodetector is connect with the first input end of the data collector, first photoswitch
Second output terminal connect with the input terminal of second photodetector, the output end of second photodetector with it is described
Second input terminal of data collector connects, and the first output end and second output terminal of second coupler are respectively with described the
The first input end of three photodetectors and the connection of the second input terminal, output end and the low pass of the third photodetector
The input terminal of filter connects, and the output end of the low-pass filter is connect with the third input terminal of the data collector.
5. a kind of distributed fiber optic temperature as claimed in claim 4 and strain sensing device, which is characterized in that the continuous light
Signal generator module includes the second modulator, the second fiber amplifier, second filter and the second photoswitch；Second modulation
The input terminal of device is connect with the second output terminal of first coupler, and the output end of second modulator is filtered with described second
The input terminal of wave device connects, and the first output end of second photoswitch is connect with the second port of the test optical fiber, described
The second output terminal of second photoswitch is connect with the second input terminal of second coupler.
6. a kind of distributed fiber optic temperature as claimed in claim 5 and strain sensing device, which is characterized in that the control mould
Block includes control unit, described control unit respectively with the control signal of first modulator, first fiber amplifier
The control signal of device, the control signal of the Polarization Controller, the control signal of first photoswitch, described second
The control signal of the control signal of modulator, the control signal and second photoswitch of second fiber amplifier
Connection, and control the conducting of the control signal.
7. a kind of distributed fiber optic temperature as claimed in claim 4 and strain sensing device, which is characterized in that the wavelength-division is multiple
The optical filter built in device；The pulsed optical signals generation module is also connect by the wavelength division multiplexer with the detecting module,
Specially：The input terminal of the wavelength division multiplexer is connect with the third port of three port circulator, the wavelength division multiplexer
The first output end connect with the input terminal of first photoswitch, the output of the second output terminal and third of the wavelength division multiplexer
End is connect with the first input end of first photodetector and the second input terminal respectively.
8. a kind of distributed fiber optic temperature as claimed in claim 7 and strain sensing device, which is characterized in that further include light letter
Number analyzer, the optical signal analysis device are connect with the output end of the data collector, to data collector output
Optical signal is analyzed, and obtains the temperature and strain information of the test optical fiber.
9. a kind of distributed fiber optic temperature as claimed in claim 6 and strain sensing device, which is characterized in that the continuous light
Signal generator module includes second laser, third coupler, adjustable attenuators and the second photoswitch；The second laser
It is connect with the input terminal of the third coupler, the input terminal of the output end and the adjustable attenuators of the third coupler
Connection, the control signal of the adjustable attenuators are connect with described control unit, the output end of the adjustable attenuators
It is connect with the input terminal of second photoswitch.
10. a kind of distributed fiber optic temperature as claimed in claim 9 and strain sensing device, which is characterized in that further include frequency
Rate difference locking module and the 4th coupler；The difference on the frequency locking module passes through the first laser device and the pulsed optical signals
Generation module connects, and is connect with the continuous optical signal generation module by the second laser, and the difference on the frequency locks mould
Block is connect with the 4th coupler, and the 4th coupler generates mould by first coupler and the pulsed optical signals
Block connects.
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| CN201721891731.5U CN207636092U (en) | 2017-12-28 | 2017-12-28 | A kind of distributed fiber optic temperature and strain sensing device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108020250A (en) * | 2017-12-28 | 2018-05-11 | 浙江杰昆科技有限公司 | A kind of distributed fiber optic temperature and strain sensing device |
| CN112325786A (en) * | 2020-10-28 | 2021-02-05 | 山东电力工程咨询院有限公司 | Offshore steel pipe pile operation period online monitoring method based on dense distribution |
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2017
- 2017-12-28 CN CN201721891731.5U patent/CN207636092U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108020250A (en) * | 2017-12-28 | 2018-05-11 | 浙江杰昆科技有限公司 | A kind of distributed fiber optic temperature and strain sensing device |
| CN112325786A (en) * | 2020-10-28 | 2021-02-05 | 山东电力工程咨询院有限公司 | Offshore steel pipe pile operation period online monitoring method based on dense distribution |
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