CN103616089B - A kind of optical fiber temperature vibration sensor and comprehensive monitoring system and method - Google Patents
A kind of optical fiber temperature vibration sensor and comprehensive monitoring system and method Download PDFInfo
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- CN103616089B CN103616089B CN201310641014.7A CN201310641014A CN103616089B CN 103616089 B CN103616089 B CN 103616089B CN 201310641014 A CN201310641014 A CN 201310641014A CN 103616089 B CN103616089 B CN 103616089B
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Abstract
The present invention relates to Fibre Optical Sensor and safety protection field, specifically a kind of optical fiber temperature vibration sensor and comprehensive monitoring system and method for being capable of monitoring temperature information and vibration information simultaneously, it is characterized in that including pulse laser, 2*2 photo-couplers, first sensor fibre, wavelength division multiplexer, second sensor fibre, dorsad Anti-Stokes signal opto-electronic receiver module, dorsad Stokes signal opto-electronic receiver module, Rayleigh scattering signal opto-electronic receiver module, coherent light signal opto-electronic receiver module, respectively with dorsad Anti-Stokes signal opto-electronic receiver module, dorsad Stokes signal opto-electronic receiver module, the data acquisition unit that the output end of Rayleigh scattering signal opto-electronic receiver module and coherent light signal opto-electronic receiver module is connected, the present invention is compared with prior art, with higher vibration detection sensitivity.
Description
Technical field
The present invention relates to Fibre Optical Sensor and safety protection field, specifically one kind can simultaneously monitoring temperature information and
The optical fiber temperature vibration sensor and comprehensive monitoring system and method for vibration information.
Background technology
Distributed optical fiber temperature sensor be using optical fiber spontaneous Raman scattering light intensity by temperature modulation principle and light when
Domain principle of reflection and the distributed optical fiber Raman temperature sensor constituted, with wide application market.Because it can be online
The temperature at real-time prediction scene and its trend of change, set alarm temperature to be monitored scene temperature change, be it is a kind of this
The safety-type line-type heat detector of matter, has been successfully applied to the fields such as petroleum and petrochemical industry, electric power and harbour.
Optical fiber perimeter security protection has very strong military and civilian value as perimeter alarm system of new generation, can be used for prison
The safety monitoring of the circumferences such as prison, target of military importance, arm store, can be also used for the critical facilitys such as nuclear power station, petroleum and petrochemical industry
Circumference safety monitoring, optical fiber perimeter security protection mainly employs optical fibre vibration sensor, should by monitoring border a small range environment
Power changes the influence to optical fiber, analysis invasion vibration signal, and its only row is judged and alarmed.
In the prior art, Chinese patent CN200910099463.7 discloses a kind of fully distributed fiber Rayleigh and Raman
Scattered photon strain, temperature sensor, carry out stress monitoring, Raman diffused light using Rayleigh scattering signal and carry out temperature monitoring,
But program stress intensity is calculated with fibre loss relation using simulation model, precision is not high.Chinese patent
The distribution type fiber-optic Brillouin sensing device for a kind of fusion optical fiber Brillouin frequency shifter that CN201010566517.9 is announced, using cloth
In deep technology realize the synchro measure of temperature and stress, but the program is complicated, costly.Chinese patent
It is a kind of while the distribution type optical fiber sensing equipment and method of vibration and temperature are measured, using auspicious that CN201210059875.X is announced
Profit is from the relevant detection and positioning vibrated, but positioning precision is poor.
The content of the invention
The present invention proposes that a kind of rational in infrastructure, production cost is low, accurate for shortcoming and defect present in prior art
Reliably, be particularly suitable for use in temperature and vibration at the same detect application environment optical fiber temperature vibration sensor and comprehensive monitoring system and
Method.
The present invention can be reached by following measures：
A kind of optical fiber temperature vibration sensor, provided with thermometric loop, the relevant loop of vibration and location determination loop, it is special
Levy and be to include provided with thermometric loop, the relevant loop of vibration and location determination loop, it is characterised in that including pulse laser,
The 2*2 photo-couplers and the output end all the way of 2*2 photo-couplers being connected with pulse laser output end are through fibre delay line phase
Wavelength division multiplexer and wavelength-division that the first sensor fibre, the input of connection are connected with second output end of 2*2 photo-couplers
The second sensor fibre that the COM ends of multiplexer are connected, being used for successively of being connected respectively with the output end of wavelength division multiplexer connect
Dorsad Raman anti-Stokes optical signal, dorsad Raman Stokes optical signal and the Rayleigh for receiving the output of the second sensor fibre dissipate
Penetrate the dorsad Anti-Stokes signal opto-electronic receiver module of signal, dorsad Stokes signal opto-electronic receiver module, Rayleigh scattering
Signal photoelectricity receiving module, what is be connected with the output end of 2*2 photo-couplers is used to receive by the first sensor fibre and second
The coherent light signal opto-electronic receiver module of signal after the two-way back rayleigh scattering signal coherence of sensor fibre output, respectively with the back of the body
To Anti-Stokes signal opto-electronic receiver module, dorsad Stokes signal opto-electronic receiver module, Rayleigh scattering signal photoelectricity connect
The data acquisition unit that the output end of receipts module and coherent light signal opto-electronic receiver module is connected.
In heretofore described data acquisition unit be provided be used for receive dorsad Anti-Stokes signal opto-electronic receiver module,
Dorsad Stokes signal opto-electronic receiver module, Rayleigh scattering signal opto-electronic receiver module output electric signal dorsad light-receiving
Circuit, output end respectively with pulse laser, dorsad optical receiving circuit and interval Acquisition Circuit be connected pulse-triggered electricity
Road, the interval Acquisition Circuit that input is connected with coherent light signal opto-electronic receiver module, with dorsad optical receiving circuit output end
The accumulation process circuit being connected, and the upload circuit being connected respectively with accumulation process circuit, interval Acquisition Circuit.
The centre wavelength of pulse optical fiber can be 1550nm, pulse width 10ns, repetition rate in the present invention
10KHz, peak power 20W, spectrum width 0.1nm；2*2 fiber couplers, corresponding centre wavelength is 1550nm, and splitting ratio is 50：
50, insertion loss<0.7dB；Corresponding wavelength division multiplexer by centre wavelength 1450nm dorsad Raman anti-Stokes scattering light
Wideband filtered piece, centre wavelength 1660nm dorsad Raman Stokes ratio wideband filtered piece and the filter of Rayleigh scattered lights
Wave plate, and the 1*2 couplers being connected with Rayleigh scattered light filter plates are constituted；Data acquisition unit, sample rate is divided into
100MSPS and the corresponding analog input channel number of 10KSPS, 100MSPS sample rate are the corresponding simulation of 3,10KMSPS sample rates
Input channel number is that 1, ADC precision is 12bits.
Heretofore described firing ring route pulse laser, wavelength division multiplexer, dorsad the second sensor fibre, anti-stoke
This opto-electronic receiver module, dorsad Stokes photoelectricity receiving module and data groups of acquisition units into.
The heretofore described relevant loop of vibration by pulse laser, 2*2 couplers, fibre delay line, wavelength division multiplexer,
First sensor fibre, back rayleigh scattering signal photoelectricity receiving module and data groups of acquisition units into.
Location determination circuit of the present invention is by pulse laser, wavelength division multiplexer, the first sensor fibre, the second sense light
Fine, opto-electronic receiver module and data groups of acquisition units into.
Heretofore described data acquisition unit is receiving dorsad Raman stokes light, dorsad Raman anti-Stokes light
There is following relation with the sample frequency and pulse width of Rayleigh scattering signal signal receiving circuit：Ssf=100/X, in：SsfTo adopt
Sample frequency, unit：MSPS, X are pulse width, and unit is ns.
Heretofore described data acquisition unit is receiving the sample frequency of Rayleigh coherent light signal receiving circuit and pulse
Width has following relation：Srf=100/X, wherein：SrfFor sample frequency, unit：KSPS, X are pulse width, and unit is ns.
Pulse width of the present invention has following relation with sensor repetition rate and measurement distance：Fs=100/X, Ls=100/X,
Wherein：fsFor repetition rate, unit：KHz, LsFor measurement distance, unit is Km, and X is pulse width, and unit is ns.
A kind of vibration integrated monitoring system of fiber optic temperature, the fiber optic temperature shake being connected provided with industrial computer and with industrial computer
Dynamic sensor, it is characterised in that optical fiber temperature vibration sensor uses said structure, data acquisition unit will connect through uploading circuit
Raman scattering signal, Rayleigh signal and the Rayleigh coherent signal received is uploaded to industrial computer through usb bus.
A kind of application method of the vibration integrated monitoring system of fiber optic temperature, it is characterised in that comprise the following steps：
Step 1：Data acquisition unit sends pulse triggering signal, the output pulse of trigger pulse laser to pulse laser
Light；
Step 2：The optical signal of pulse laser output is after 2*2 couplers, and 50% light enters first through fibre delay line and passed
Photosensitive fibre, com end of another 50% light through wavelength division multiplexer enters the second sensor fibre；
Step 3：Optical signal enters after sensor fibre, the back scattering Raman optical signal that is produced in the second sensor fibre and auspicious
Sharp scattered signal is divided into stokes light, anti-Stokes light and Rayleigh scattering signal through wavelength division multiplexer, respectively by with wavelength-division
The corresponding opto-electronic receiver module that multiplexer is connected is received, while the Rayleigh scattering signal signal in the second sensor fibre enters
The Rayleigh scattering signal produced in the input all the way of 2*2 couplers, the first sensor fibre enters 2*2 couplings through fibre delay line 3
Another road input of clutch, the Rayleigh scattering signal that two-way optical fiber is produced is interfered in 2*2 couplers, the coherent light of generation
Signal is received by coupled coherent light signal opto-electronic receiver module；
Step 4：It is anti-that dorsad optical receiving circuit in data acquisition unit receives backscattering stokes light, backscattering
The electric signal that stokes light and Rayleigh scattering signal are produced is acquired by dorsad optical receiving circuit, and by accumulation process electricity
The output electric signal that road carries out the Rayleigh interference exported in accumulation process, optical fiber through 2*2 couplers is carried out by interval Acquisition Circuit
The data that collection, accumulated process circuit and interval are gathered using circuit are uploaded to industrial computer by coupled upload circuit；
Step 5：Industrial computer is received after the data uploaded by data acquisition unit, according to anti-Stokes and Stokes electricity
The relation that signal intensity ratio is directly proportional to temperature, host computer calculates the signal intensity on sensor fibre at optical fiber present position
Temperature information, according to invasion produce phase difference, by detecting whether the signal determining of interference signal invades, according to auspicious
Sharp scattered signal is to the characteristic of stress sensitive, monitoring fiber stress change, identified sign position, output invasion place.
Thermometric loop obtains the temperature information in region to be measured according to following principle in the present invention：When incident laser and optical fiber point
Son produces nonlinear interaction scattering, and releasing a phonon turns into Stokes ratio, and absorbing a phonon turns into anti-
Stokes Raman scattered photon, the Phonon frequency of optical fiber molecule is 13.2THz.Population heat distribution clothes on fine molecular entergy level
From Boltzmann's law, the strength ratio R (T) and temperature phase of anti-Stokes Raman scattered light and Stokes Raman scattered light
Close, its expression formula is：
,
Wherein：VAS、VSRespectively divide the frequency of Stokes Raman scattered photon and Stokes Raman scattered photon, h
It is Planck's constant, △ V are the Phonon frequencies of optical fiber molecule, and k is Boltzmann constant, and T is Kelvin's absolute temperature.
Relevant loop is vibrated in the present invention vibration data is obtained according to following principle：
After incident laser and optical fiber molecule produce elastic collision, dissipated with the rear orientation light of incident light same frequency for Rayleigh
Light is penetrated, the Rayleigh scattering light for meeting coherent condition produces the interference of light at the place of meeting, because phase difference causes dividing again for luminous intensity
Cloth, passes through the vibration that intensity monitor is extraneous.
Location determination loop obtains position location data according to following principle in the present invention：When incident laser and optical fiber molecule
Produce after elastic collision, be Rayleigh scattering light with the rear orientation light of incident light same frequency, Rayleigh scattering light to stress sensitive, when
The external world has will produce added losses during vibration to Rayleigh scattering signal, cause the change of light intensity, can be released by monitoring light intensity
The position that event occurs, so as to be positioned.Based on OTDR technique, incidence end and laser pulse are returned by determining scattering pulse
The time difference △ t that sets out calculates the position L of vibrationx, its expression formula is：
, in：LxFor the position of vibration, c is the light velocity in vacuum, and n is the refractive index of optical fiber.
The present invention compared with prior art, has the advantages that：
The present invention uses a set of light path system, realizes long range temperature and the synchronous sensing of vibration, greatly reduces into
This；Using the thermally sensitive characteristic of Raman light, monitoring temperature and its change；Using Rayleigh coherent detection technology, with higher
Vibration detection sensitivity；Using Rayleigh scattering signal to stress sensitivity characteristic, vibration position is identified, is realized to intrusion event
Position detection.
Brief description of the drawings：
Accompanying drawing 1 is the structural representation of optical fiber temperature vibration sensor in the present invention.
Accompanying drawing 2 is the structural representation of comprehensive monitoring system in the present invention.
Accompanying drawing 3 is optical fiber temperature vibration sensor and the comprehensive monitoring system using the sensor in the embodiment of the present invention 2
Structural representation.
Accompanying drawing 4 is the structural representation of data acquisition unit of the present invention.
Reference：Pulse optical fiber 1,2*2 couplers 2, fibre delay line 3, wavelength division multiplexer 4, first are sensed
Optical fiber 5, dorsad Anti-Stokes signal opto-electronic receiver module 6, dorsad Stokes signal opto-electronic receiver module 7, Rayleigh scattering
Signal photoelectricity receiving module 8, coherent light signal opto-electronic receiver module 9, data acquisition unit 10, industrial computer 11, image intensifer 12,
Semiconductor laser 13, dorsad optical receiving circuit 14, accumulation process circuit 15, interval Acquisition Circuit 16, pulsed triggering circuit 17,
Upload circuit 18, the second sensor fibre 19.
Embodiment：
The present invention is further illustrated with reference to the accompanying drawings and examples.
As shown in Figure 1, the present invention proposes a kind of optical fiber temperature vibration sensor, relevant provided with thermometric loop, vibration
Loop and location determination loop, it is characterised in that the 2*2 being connected including pulse laser 1, with the output end of pulse laser 1
Photo-coupler 2, the first sensor fibre 5, the input being connected with the output end all the way of 2*2 photo-couplers 2 through fibre delay line 3
The wavelength division multiplexer 4 that is connected with second output end of 2*2 photo-couplers 2, it is connected with the COM ends of wavelength division multiplexer 4
Second sensor fibre 19, be connected respectively with the output end of wavelength division multiplexer 4 successively be used for receive the second sensor fibre 19 it is defeated
Dorsad Raman anti-Stokes optical signal, dorsad Raman Stokes optical signal and the Rayleigh scattering signal gone out it is dorsad anti-this
Lentor signal photoelectricity receiving module 6, dorsad Stokes signal opto-electronic receiver module 7, Rayleigh scattering signal opto-electronic receiver mould
Block 8, what is be connected with the output end of 2*2 photo-couplers 2 is defeated by the first sensor fibre 5 and the second sensor fibre 19 for receiving
The coherent light signal opto-electronic receiver module 9 of signal after the two-way back rayleigh scattering signal coherence gone out, respectively with dorsad this anti-support
Gram this signal photoelectricity receiving module 6, dorsad Stokes signal opto-electronic receiver module 7, Rayleigh scattering signal opto-electronic receiver module 8
And the data acquisition unit 10 that the output end of coherent light signal opto-electronic receiver module 9 is connected.
Heretofore described light-pulse generator 1 is used to provide pulsed light for system；The 2*2 couplers 2 are used for pulsed light
Source is coupled into two-way sensor fibre, and the Rayleigh scattering signal produced in two-way optical fiber is concerned with；Fibre delay line 3 is used for
The Rayleigh scattering signal produced in adjustment two-way sensor fibre reaches the time of 2*2 couplers；Dorsad Anti-Stokes signal light
Electric receiving module 6, dorsad Stokes signal opto-electronic receiver module 7, Rayleigh scattering signal opto-electronic receiver module 8, coherent light letter
Number opto-electronic receiver module 9 is used to the Raman light produced in optical fiber, Rayleigh scattering signal and Rayleigh coherent light being converted to electric signal；
Sensor fibre enters trip temperature and the sensor and transmission medium of vibration detection as system；Data acquisition unit 10 is used to be system
Pulse triggering signal is provided, the collection of Raman light, Rayleigh scattering signal and Rayleigh coherent light is carried out；Industrial computer 11 is for data point
Analysis, determine temperature along optical fiber, whether invade and invade position etc., its data acquisition unit 10 as shown in Figure 4, institute
State scattered with backscattering stokes light, backscattering anti-Stokes light and Rayleigh provided with input in data acquisition unit
Connected dorsad optical receiving circuit 14 of the output end of the opto-electronic receiver module of signal are penetrated, are connected with dorsad optical signal receiving circuit 14
The accumulation process circuit 15 connect, be connected with accumulation process circuit 15 be used for accumulation process result is uploaded to industrial computer
Conduct electricity road 18；The interval Acquisition Circuit 16 that the output end for the opto-electronic receiver module interfered with input with Rayleigh is connected is additionally provided with,
The upload circuit 18 for being used to being uploaded to interval gathered data result into industrial computer being connected with interval Acquisition Circuit 16；It is additionally provided with
For the pulsed triggering circuit 17 for the pulse signal that fixed repetition rate is sent to laser 1, pulsed triggering circuit 17 also with light
Signal receiving circuit 14 is connected with interval Acquisition Circuit 16.
The centre wavelength of pulse optical fiber 1 can be 1550nm, pulse width 10ns, repetition rate in the present invention
10KHz, peak power 20W, spectrum width 0.1nm；The corresponding centre wavelength of 2*2 fiber couplers 2 is 1550nm, and splitting ratio is 50：
50, insertion loss<0.7dB；Corresponding wavelength division multiplexer 4 by centre wavelength 1450nm dorsad Raman anti-Stokes scattering light
Wideband filtered piece, centre wavelength 1660nm dorsad Raman Stokes ratio wideband filtered piece and the filter of Rayleigh scattered lights
Wave plate, and the 1*2 couplers being connected with Rayleigh scattered light filter plates are constituted；The sample rate of data acquisition unit 10 is divided into
100MSPS and the corresponding analog input channel number of 10KSPS, 100MSPS sample rate are the corresponding simulation of 3,10KMSPS sample rates
Input channel number is that 1, ADC precision is 12bits.
Heretofore described firing ring route pulse laser, wavelength division multiplexer, dorsad the second sensor fibre, anti-stoke
This opto-electronic receiver module, dorsad Stokes photoelectricity receiving module and data groups of acquisition units into；The relevant loop of vibration by
Pulse laser, 2*2 couplers, fibre delay line, wavelength division multiplexer, the first sensor fibre, back rayleigh scattering signal photoelectricity
Receiving module and data groups of acquisition units into；The location determination circuit is by pulse laser, wavelength division multiplexer, the first sense light
Fibre, the second sensor fibre, opto-electronic receiver module and data groups of acquisition units into.
Heretofore described data acquisition unit is receiving dorsad Raman stokes light, dorsad Raman anti-Stokes light
There is following relation with the sample frequency and pulse width of Rayleigh scattering signal signal receiving circuit：Ssf=100/X, in：SsfTo adopt
Sample frequency, unit：MSPS, X are pulse width, and unit is ns.
Heretofore described data acquisition unit is receiving the sample frequency of Rayleigh coherent light signal receiving circuit and pulse
Width has following relation：Srf=100/X, wherein：SrfFor sample frequency, unit：KSPS, X are pulse width, and unit is ns.
Pulse width of the present invention has following relation with sensor repetition rate and measurement distance：Fs=100/X, Ls=100/X,
Wherein：fsFor repetition rate, unit：KHz, LsFor measurement distance, unit is Km, and X is pulse width, and unit is ns.
As shown in Figure 2, the present invention also proposes a kind of vibration integrated monitoring system of fiber optic temperature, provided with industrial computer 11 and
The fiber optic temperature shock sensor being connected with industrial computer 11, it is characterised in that optical fiber temperature vibration sensor uses above-mentioned knot
Structure, data acquisition unit 10 passes through the Raman scattering signal received, Rayleigh signal and Rayleigh coherent signal through uploading circuit 18
Usb bus is uploaded to industrial computer.
The present invention also proposes a kind of application method of the vibration integrated monitoring system of fiber optic temperature, it is characterised in that including following
Step：
Step 1：Data acquisition unit sends pulse triggering signal, the output pulse of trigger pulse laser to pulse laser
Light；
Step 2：The optical signal of pulse laser output is after 2*2 couplers, and 50% light enters first through fibre delay line and passed
Photosensitive fibre, com end of another 50% light through wavelength division multiplexer enters the second sensor fibre；
Step 3：Optical signal enters after sensor fibre, the back scattering Raman optical signal that is produced in the second sensor fibre and auspicious
Sharp scattered signal is divided into stokes light, anti-Stokes light and Rayleigh scattering signal through wavelength division multiplexer, respectively by with wavelength-division
The corresponding opto-electronic receiver module that multiplexer is connected is received, while the Rayleigh scattering signal signal in the second sensor fibre enters
The Rayleigh scattering signal produced in the input all the way of 2*2 couplers, the first sensor fibre enters 2*2 couplings through fibre delay line 3
Another road input of clutch, the Rayleigh scattering signal that two-way optical fiber is produced is interfered in 2*2 couplers, the coherent light of generation
Signal is received by coupled coherent light signal opto-electronic receiver module；
Step 4：It is anti-that dorsad optical receiving circuit in data acquisition unit receives backscattering stokes light, backscattering
The electric signal that stokes light and Rayleigh scattering signal are produced is acquired by dorsad optical receiving circuit, and by accumulation process electricity
The output electric signal that road carries out the Rayleigh interference exported in accumulation process, optical fiber through 2*2 couplers is carried out by interval Acquisition Circuit
The data that collection, accumulated process circuit and interval are gathered using circuit are uploaded to industrial computer by coupled upload circuit；
Step 5：Industrial computer is received after the data uploaded by data acquisition unit, according to anti-Stokes and Stokes electricity
The relation that signal intensity ratio is directly proportional to temperature, host computer calculates the signal intensity on sensor fibre at optical fiber present position
Temperature information, according to invasion produce phase difference, by detecting whether the signal determining of interference signal invades, according to auspicious
Sharp scattered signal is to the characteristic of stress sensitive, monitoring fiber stress change, identified sign position, output invasion place.
Thermometric loop obtains the temperature information in region to be measured according to following principle in the present invention：When incident laser and optical fiber point
Son produces nonlinear interaction scattering, and releasing a phonon turns into Stokes ratio, and absorbing a phonon turns into anti-
Stokes Raman scattered photon, the Phonon frequency of optical fiber molecule is 13.2THz.Population heat distribution clothes on fine molecular entergy level
From Boltzmann's law, the strength ratio R (T) and temperature phase of anti-Stokes Raman scattered light and Stokes Raman scattered light
Close, its expression formula is：
,
Wherein：VAS、VSRespectively divide the frequency of Stokes Raman scattered photon and Stokes Raman scattered photon, h
It is Planck's constant, △ V are the Phonon frequencies of optical fiber molecule, and k is Boltzmann constant, and T is Kelvin's absolute temperature.
Embodiment 1：
The present embodiment provides a kind of while the structural representation of the optical fiber temperature-measurement and vibrating sensor of measurement temperature and vibration,
As shown in figure 1, the output end of pulse triggering signal all the way of data acquisition unit 10 and the input phase of pulse optical fiber 1
Even, the 1550nm pulsed lights that pulse optical fiber 1 is exported are connected with the 1550nm inputs of 2*2 couplers 2,2*2 couplers 2
Output end all the way be connected with the input of fibre delay line 3, the output end of fibre delay line 3 and a 5-a optical fiber of optical fiber 5
It is connected, another road output end of 2*2 couplers 2 is connected with the 1550nm inputs of wavelength division multiplexer 4, the com of wavelength division multiplexer 4
The Rayleigh scattering signal lease making fibre delay line 3 produced in output end and the second sensor fibre, the first sensor fibre enters 2*2 couplings
The dorsad Raman anti-Stokes that is produced in the input all the way of clutch 2, the second sensor fibre, stokes scattering signal point from
1450nm the and 1660nm output ports output of wavelength division multiplexer 4, and respectively at opto-electronic receiver module 8, opto-electronic receiver module 9
Input be connected, the Rayleigh scattering signal produced in the second sensor fibre after wavelength division multiplexer 4 with opto-electronic receiver module 7 and 2*
Another road inputs of 2 couplers 2 is connected, the Rayleigh scattering signal that two optical fiber are produced after 2*2 couplers 2 produce interference with
The input of opto-electronic receiver module 6 is connected, opto-electronic receiver module 6, opto-electronic receiver module 7, opto-electronic receiver module 8 and opto-electronic receiver
Module 9 is connected with 4 road inputs of data acquisition unit 10.
Fig. 2 be the embodiment of the present invention while measurement temperature and vibration optical fiber temperature-measurement and vibrating sensor and use the biography
The structural representation of the comprehensive monitoring system of sensor, including industrial computer 11 and optical fiber temperature-measurement and vibrating sensor, optical fiber temperature-measurement
And the data acquisition unit 10 in vibrating sensor is connected with industrial computer 11, data acquisition unit 10 is by the Raman scattering received
Signal, Rayleigh signal and Rayleigh coherent signal are uploaded to industrial computer 11 through usb bus, wherein the optical fiber temperature-measurement and vibrating sensing
Device is using above-mentioned a kind of suitable for measurement temperature simultaneously and the optical fiber temperature-measurement and vibrating sensor of vibration.
In the present embodiment, light source uses pulse optical fiber 1, the pulse optical fiber, and centre wavelength is
1550nm, pulse width 10ns, repetition rate 10KHz, peak power 20W, spectrum width 0.1nm.
In the present embodiment, the 2*2 couplers 2, centre wavelength 1550nm, splitting ratio is 50：50, insertion loss<
0.7dB。
In the present embodiment, described wavelength division multiplexer 4, by centre wavelength 1450nm dorsad Raman anti-Stokes scattering
The dorsad Raman Stokes ratio wideband filtered piece and Rayleigh scattered lights of light wideband filtered piece, centre wavelength 1660nm
Filter plate, and the 1*2 couplers being connected with Rayleigh scattered light filter plates are constituted, and the 1*2 couplers splitting ratio is 50：
50, insertion loss<0.7dB.
In the present embodiment, described data acquisition unit 10, sample rate is divided into 100MSPS and 10KSPS, 100MSPS samplings
The corresponding analog input channel number of rate is that the corresponding analog input channel number of 3,10KMSPS sample rates is that 1, ADC precision is
12bits。
Embodiment 2：
The optical fiber temperature-measurement and vibrating sensor and use that the present embodiment provides another measurement temperature and vibration simultaneously should
The comprehensive monitoring system of sensor, its structural representation as shown in figure 3, with the optical fiber temperature-measurement and vibrating sensor of Fig. 2 structures and
Using the comprehensive monitoring system of the sensor, difference is：Light source using semiconductor laser 13 plus image intensifer 12 come
Realize, the pulse triggering signal driving semiconductor laser 13 exported by data acquisition unit 10 realizes that small-power pulsed light is believed
Number, small-power pulsed light exports powerful pulsed light after image intensifer 12, and this mode reduces the limit to light source power
System, while having the characteristics of cost is low.
In the present embodiment, the semiconductor laser 13, centre wavelength is 1550nm, threshold current 10mA, thermistor
10kohm, spectrum width 0.1nm, power 15mW.
In the present embodiment, the image intensifer 12, amplification pulse width is 1-2us, and repetition rate is 4-10kHz, peak value
Power is 1-10W, extinction ratio 40dB.
The embodiment of the present invention announce for better embodiment, but its specific implementation is not limited to this, this area it is common
Technical staff easily according to above-described embodiment, understands the spirit of the present invention, and makes different amplifications and change, without departing from
The spirit of the present invention, all belongs within protection scope of the present invention.
Claims (8)
1. a kind of optical fiber temperature vibration sensor, provided with thermometric loop, the relevant loop of vibration and location determination loop, its feature
It is to include pulse laser, the 2*2 photo-couplers being connected with pulse laser output end and 2*2 photo-couplers all the way
The first sensor fibre that output end is connected through fibre delay line, input are connected with second output end of 2*2 photo-couplers
The wavelength division multiplexer connect, the second sensor fibre being connected with the COM ends of wavelength division multiplexer, output respectively with wavelength division multiplexer
What end was connected is used to receive the dorsad Raman anti-Stokes optical signal of the second sensor fibre output, dorsad this support of Raman successively
Gram this optical signal and the dorsad Anti-Stokes signal opto-electronic receiver module of Rayleigh scattering signal, dorsad Stokes signal light
Electric receiving module, Rayleigh scattering signal opto-electronic receiver module, being used for of being connected with the output end of 2*2 photo-couplers are received by the
The coherent light signal light of signal after one sensor fibre and the two-way back rayleigh scattering signal coherence of the second sensor fibre output
Electric receiving module, respectively with dorsad Anti-Stokes signal opto-electronic receiver module, dorsad Stokes signal opto-electronic receiver module,
The data acquisition list that the output end of Rayleigh scattering signal opto-electronic receiver module and coherent light signal opto-electronic receiver module is connected
Member.
2. a kind of optical fiber temperature vibration sensor according to claim 1, it is characterised in that in the data acquisition unit
Provided with for receiving dorsad Anti-Stokes signal opto-electronic receiver module, dorsad Stokes signal opto-electronic receiver module, Rayleigh
The dorsad optical receiving circuit of electric signal of scattered signal opto-electronic receiver module output, output end respectively with pulse laser, dorsad
The pulsed triggering circuit that optical receiving circuit and interval Acquisition Circuit are connected, input and coherent light signal opto-electronic receiver mould
The interval Acquisition Circuit that block is connected, the accumulation process circuit being connected with dorsad optical receiving circuit output end, and respectively with
The upload circuit that accumulation process circuit, interval Acquisition Circuit are connected.
3. a kind of optical fiber temperature vibration sensor according to claim 1, it is characterised in that the middle cardiac wave of pulse laser
A length of 1550nm, pulse width 10ns, repetition rate 10KHz, peak power 20W, spectrum width 0.1nm；2*2 fiber couplers, it is right
The centre wavelength answered is 1550nm, and splitting ratio is 50：50, insertion loss<0.7dB；Corresponding wavelength division multiplexer is by centre wavelength
1450nm dorsad Raman anti-Stokes scattering light wideband filtered piece, centre wavelength 1660nm dorsad Raman Stokes dissipate
Penetrate light wideband filtered piece and Rayleigh scattered light filter plates, and the 1*2 couplings being connected with Rayleigh scattered light filter plates
Device is constituted；Data acquisition unit, sample rate is divided into 100MSPS and 10KSPS, the corresponding analog input channel of 100MSPS sample rates
Number is that the corresponding analog input channel number of 3,10KMSPS sample rates is that 1, ADC precision is 12bits.
4. a kind of optical fiber temperature vibration sensor according to claim 1, it is characterised in that the data acquisition unit exists
Receive dorsad Raman stokes light, dorsad Raman anti-Stokes light and Rayleigh scattering signal signal receiving circuit sampling frequency
Rate has following relation with pulse width：Ssf=100/X, in：SsfFor sample frequency, unit：MSPS, X are pulse width, and unit is
ns。
5. a kind of optical fiber temperature vibration sensor according to claim 1, it is characterised in that the data acquisition unit exists
The sample frequency and pulse width for receiving Rayleigh coherent light signal receiving circuit have following relation：Srf=100/X, wherein：SrfFor
Sample frequency, unit：KSPS, X are pulse width, and unit is ns.
6. a kind of optical fiber temperature vibration sensor according to claim 1, it is characterised in that pulse width is thought highly of with sensing
Complex frequency and measurement distance have following relation：Fs=100/X, Ls=100/X, wherein：fsFor repetition rate, unit：KHz, LsTo survey
Span is from unit is Km, and X is pulse width, and unit is ns.
7. a kind of vibration integrated monitoring system of fiber optic temperature, the fiber optic temperature vibration being connected provided with industrial computer and with industrial computer
Sensor, it is characterised in that optical fiber temperature vibration sensor is the data acquisition unit as described in any one in claim 1-6
The Raman scattering signal received, Rayleigh signal and Rayleigh coherent signal are uploaded to industrial computer through usb bus through upload circuit.
8. a kind of application method of the vibration integrated monitoring system of fiber optic temperature as claimed in claim 7, it is characterised in that including
Following steps：
Step 1：Data acquisition unit sends pulse triggering signal, trigger pulse laser output pulsed light to pulse laser；
Step 2：The optical signal of pulse laser output is after 2*2 couplers, and 50% light enters the first sense light through fibre delay line
Fibre, com end of another 50% light through wavelength division multiplexer enters the second sensor fibre；
Step 3：Optical signal enters after sensor fibre, and the backscattering Raman optical signal and Rayleigh produced in the second sensor fibre dissipates
Penetrate signal and be divided into stokes light, anti-Stokes light and Rayleigh scattering signal through wavelength division multiplexer, respectively by with wavelength-division multiplex
The corresponding opto-electronic receiver module that device is connected is received, while the Rayleigh scattering signal signal in the second sensor fibre enters 2*2
The Rayleigh scattering signal produced in the input all the way of coupler, the first sensor fibre enters 2*2 couplers through fibre delay line
Another road input, two-way optical fiber produce Rayleigh scattering signal interfered in 2*2 couplers, the coherent light signal of generation
Received by coupled coherent light signal opto-electronic receiver module；
Step 4：Dorsad optical receiving circuit in data acquisition unit receives this anti-support of backscattering stokes light, backscattering
The electric signal that Ke Si light and Rayleigh scattering signal are produced, and carried out by accumulation process circuit in accumulation process, optical fiber through 2*2 couplings
The output electric signal of the Rayleigh interference of clutch output is acquired by interval Acquisition Circuit, accumulated process circuit and interval collection
The data of circuit collection are uploaded to industrial computer by the upload circuit being connected with data acquisition unit；
Step 5：Industrial computer is received after the data uploaded by data acquisition unit, according to anti-Stokes and Stokes electric signal
The relation that strength ratio is directly proportional to temperature, host computer calculates the signal intensity on sensor fibre the temperature at optical fiber present position
Information is spent, the phase difference produced according to invasion, by detecting whether the signal determining of interference signal invades, dissipates according to Rayleigh
Penetrate characteristic of the signal to stress sensitive, monitoring fiber stress change, identified sign position, output invasion place.
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