CN103616089A - Optical fiber temperature vibration sensor and comprehensive monitoring system and method - Google Patents
Optical fiber temperature vibration sensor and comprehensive monitoring system and method Download PDFInfo
- Publication number
- CN103616089A CN103616089A CN201310641014.7A CN201310641014A CN103616089A CN 103616089 A CN103616089 A CN 103616089A CN 201310641014 A CN201310641014 A CN 201310641014A CN 103616089 A CN103616089 A CN 103616089A
- Authority
- CN
- China
- Prior art keywords
- signal
- stokes
- dorsad
- light
- receiver module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
The invention relates to the field of optical fiber sensing and safety protection, in particular to an optical fiber temperature vibration sensor and a comprehensive monitoring system and method, wherein the temperature information and the vibration information can be monitored at the same time. The optical fiber temperature vibration sensor is characterized by comprising a pulse laser, a 2*2 optical coupler, a first sensing optical fiber, a wavelength division multiplexer, a second sensing optical fiber, a reverse anti-Stokes signal photoelectricity receiving module, a reverse Stokes signal photoelectricity receiving module, a rayleigh scattering signal photoelectricity receiving module, a coherent light signal photoelectricity receiving module and a data collecting module which is respectively connected with the output end of the reverse anti-Stokes signal photoelectricity receiving module, the output end of the reverse Stokes signal photoelectricity receiving module, the output end of the rayleigh scattering signal photoelectricity receiving module and the output end of the coherent light signal photoelectricity receiving module. Compared with the prior art, the optical fiber temperature vibration sensor has the higher vibration detecting sensitivity.
Description
Technical field
The present invention relates to Fibre Optical Sensor and safety protection field, specifically fiber optic temperature vibration transducer and comprehensive monitoring system and the method for a kind of monitor temperature information simultaneously and vibration information.
Background technology
Distributed optical fiber temperature sensor is to utilize optical fiber spontaneous Raman scattering light intensity to be subject to the principle of temperature modulation and optical time domain reflection principle and the distributed optical fiber Raman temperature sensor that forms, has wide application market.Due to its temperature at real-time prediction scene and the trend of variation thereof online, alarm temperature is set scene temperature is changed and monitored, be a kind of line-type heat detector of essential safe type, be successfully applied to the fields such as petroleum and petrochemical industry, electric power and harbour.
Optical fiber perimeter security protection is as perimeter alarm system of new generation, there is very strong military and civilian value, can be for the safety monitoring of the circumferences such as prison, target of military importance, arm store, can also be for the circumference safety monitoring of the critical facilitys such as nuclear power station, petroleum and petrochemical industry, optical fiber perimeter security protection has mainly adopted optical fibre vibration sensor, by monitoring the border impact of interior environmental stress variation on optical fiber among a small circle, analyze invasion vibration signal, and it is only gone and is judged and warning.
In the prior art, Chinese patent CN200910099463.7 has announced a kind of fully distributed fiber Rayleigh and Raman scattering photon strain, temperature sensor, employing Rayleigh scattering signal carries out stress monitoring, Raman diffused light carries out temperature monitoring, but this scheme stress intensity and fibre loss relation adopt realistic model to calculate, and precision is not high.A kind of distribution type fiber-optic Brillouin sensing device that merges optical fiber Brillouin frequency shifter that Chinese patent CN201010566517.9 announces, employing Brillouin technology realizes the synchro measure of temperature and stress, but this scheme complex structure, cost is expensive.A kind of while measuring vibrations that Chinese patent CN201210059875.X announces and distribution type optical fiber sensing equipment and the method for temperature, adopt Rayleigh from relevant detection and the location vibrating, but positioning precision is poor.
Summary of the invention
The present invention is directed to the shortcoming and defect existing in prior art, propose a kind of rational in infrastructure, production cost is low, accurately and reliably, be specially adapted to temperature and vibration detects fiber optic temperature vibration transducer and comprehensive monitoring system and the method for applied environment simultaneously.
The present invention can reach by following measures:
A kind of fiber optic temperature vibration transducer, be provided with thermometric loop, the relevant loop of vibration and location determination loop, it is characterized in that comprising and be provided with thermometric loop, the relevant loop of vibration and location determination loop, it is characterized in that comprising pulsed laser, the 2*2 photo-coupler being connected with pulsed laser output terminal, the first sensor fibre being connected through fibre delay line with 2*2 photo-coupler Yi road output terminal, second wavelength division multiplexer that output terminal is connected of input end and 2*2 photo-coupler, the second sensor fibre being connected with the COM end of wavelength division multiplexer, the anti-Stokes of the Raman dorsad light signal of exporting for receiving the second sensor fibre being successively connected with the output terminal of wavelength division multiplexer respectively, the signal of the anti-Stokes dorsad photoelectricity receiver module of Raman Stokes light signal and Rayleigh scattering signal dorsad, Stokes signal photoelectricity receiver module dorsad, Rayleigh scattering signal photoelectricity receiver module, be connected with the output terminal of 2*2 photo-coupler for receive by the two-way of the first sensor fibre and the second sensor fibre output dorsad Rayleigh scattering signal relevant after the coherent light signal photoelectricity receiver module of signal, respectively with anti-Stokes signal photoelectricity receiver module dorsad, Stokes signal photoelectricity receiver module dorsad, the data acquisition unit that the output terminal of Rayleigh scattering signal photoelectricity receiver module and coherent light signal photoelectricity receiver module is connected.
Described in the present invention, in data acquisition unit, be provided with for receiving anti-Stokes signal photoelectricity receiver module dorsad, Stokes signal photoelectricity receiver module dorsad, the optical receiving circuit dorsad of the electric signal of Rayleigh scattering signal photoelectricity receiver module output, output terminal respectively with pulsed laser, optical receiving circuit dorsad, and the pulsed triggering circuit that is connected of interval Acquisition Circuit, the interval Acquisition Circuit that input end is connected with coherent light signal photoelectricity receiver module, with the accumulation process circuit that optical receiving circuit output terminal is connected dorsad, and respectively with accumulation process circuit, interval Acquisition Circuit is connected uploads circuit.
In the present invention, the centre wavelength of pulse optical fiber can be 1550nm, pulse width 10ns, repetition frequency 10KHz, peak power 20W, spectrum width 0.1nm; 2*2 fiber coupler, corresponding centre wavelength is 1550nm, splitting ratio is 50:50, insertion loss <0.7dB; Corresponding wavelength division multiplexer is by the anti Stokes scattering of the Raman dorsad light wideband filtered sheet of centre wavelength 1450nm, the Stokes ratio of Raman dorsad wideband filtered sheet and the Rayleigh scattered light filter plate of centre wavelength 1660nm, and the 1*2 coupling mechanism being connected with Rayleigh scattered light filter plate forms; Data acquisition unit, sampling rate is divided into 100MSPS and 10KSPS, and analog input channel number corresponding to 100MSPS sampling rate is that analog input channel number corresponding to 3,10KMSPS sampling rate is that 1, ADC precision is 12bits.
The route of firing ring described in the present invention pulsed laser, wavelength division multiplexer, the second sensor fibre, dorsad anti-Stokes photoelectricity receiver module, Stokes photoelectricity receiver module and data acquisition unit form dorsad.
The relevant loop of vibration described in the present invention is by pulsed laser, 2*2 coupling mechanism, fibre delay line, wavelength division multiplexer, the first sensor fibre, Rayleigh scattering signal photoelectricity receiver module and data acquisition unit form dorsad.
Location determination circuit of the present invention is comprised of pulsed laser, wavelength division multiplexer, the first sensor fibre, the second sensor fibre, photoelectricity receiver module and data acquisition unit.
Data acquisition unit described in the present invention is receiving Raman stokes light dorsad, sample frequency and the pulse width of Raman anti-Stokes light and Rayleigh scattering signal signal receiving circuit have following relation: S dorsad
sf=100/X, in: S
sffor sample frequency, unit: MSPS, X is pulse width, unit is ns.
Data acquisition unit described in the present invention has following relation: S in the sample frequency and the pulse width that receive Rayleigh coherent light signal receiving circuit
rf=100/X, wherein: S
rffor sample frequency, unit: KSPS, X is pulse width, unit is ns.
Pulse width of the present invention and sensor repetition frequency and measuring distance have following relation: fs=100/X, Ls=100/X, wherein: f
sfor repetition frequency, unit: KHz, L
sfor measuring distance, unit is Km, and X is pulse width, and unit is ns.
The vibration integrated supervisory system of a kind of fiber optic temperature, the fiber optic temperature shock sensor that is provided with industrial computer and is connected with industrial computer, it is characterized in that fiber optic temperature vibration transducer adopts said structure, data acquisition unit is uploaded to industrial computer by the Raman scattering signal receiving, Rayleigh signal and Rayleigh coherent signal through usb bus through uploading circuit.
A using method for the vibration integrated supervisory system of fiber optic temperature, is characterized in that comprising the following steps:
Step 1: data acquisition unit is to pulsed laser transmitted trigger pip, and trigger pulse laser instrument is exported pulsed light;
Step 2: the light signal of pulsed laser output is after 2*2 coupling mechanism, and 50% light enters the first sensor fibre through fibre delay line, another 50% light enters the second sensor fibre through the com of wavelength division multiplexer end;
Step 3: light signal enters after sensor fibre, the back scattering Raman light signal and the Rayleigh scattering signal that in the second sensor fibre, produce are divided into stokes light through wavelength division multiplexer, anti-Stokes light and Rayleigh scattering signal, by the corresponding photoelectricity receiver module being connected with wavelength division multiplexer, received respectively, Rayleigh scattering signal signal in the second sensor fibre enters 2*2 coupling mechanism Yi road input end simultaneously, the Rayleigh scattering signal producing in the first sensor fibre enters another road input end of 2*2 coupling mechanism through fibre delay line 3, the Rayleigh scattering signal that two-way optical fiber produces interferes at 2*2 coupling mechanism, the coherent light signal producing is received by coupled coherent light signal photoelectricity receiver module,
Step 4: optical receiving circuit dorsad in data acquisition unit receives electric signal that backscattering stokes light, backscattering anti-Stokes light and Rayleigh scattering signal produce and gathered by optical receiving circuit dorsad, and carry out accumulation process by accumulation process circuit, the output electrical signals of the Rayleigh interfere of exporting through 2*2 coupling mechanism in optical fiber is gathered by interval Acquisition Circuit, through accumulation process circuit and interval, adopts the data of circuit collection to be uploaded to industrial computer by the coupled circuit of uploading;
Step 5: industrial computer receives after the data of being uploaded by data acquisition unit, according to anti-Stokes to Stokes electrical signal intensity than the relation being directly proportional to temperature, host computer calculates the signal intensity on sensor fibre the temperature information at place, optical fiber present position, the phase differential producing according to invasion, whether by detecting the signal determining of interference signal, invade, according to the characteristic of Rayleigh scattering signal counter stress sensitivity, monitoring fiber stress changes, determine stress position, output invasion place.
In the present invention, thermometric loop obtains the temperature information in region to be measured according to following principle: when incident laser and optical fiber molecule generation nonlinear interaction scattering, emit a phonon and become Stokes ratio, absorbing a phonon becomes anti-Stokes Raman scattering photon, and the Phonon frequency of optical fiber molecule is 13.2THz.Boltzmann's law is obeyed in population heat distribution on fine molecular entergy level, strength ratio R (T) and the temperature correlation of anti-Stokes Raman diffused light and Stokes Raman diffused light, and its expression formula is:
Wherein: V
aS, V
sthe frequency that is respectively minute Stokes Raman scattering photon and Stokes Raman scattering photon, h is Planck's constant, and △ V is the Phonon frequency of optical fiber molecule, and k is Boltzmann constant, and T is Kelvin's absolute temperature.
In the present invention, the relevant loop of vibration obtains vibration data according to following principle:
After incident laser and optical fiber molecule generation elastic collision, with the rear orientation light of incident light same frequency be Rayleigh scattering light, the Rayleigh scattering light that meets coherent condition produces the interference of light at the place of meeting, because phase differential causes the redistribution of light intensity, by the vibration in the intensity monitor external world.
In the present invention, location determination loop obtains position location data according to following principle: after incident laser and optical fiber molecule generation elastic collision, with the rear orientation light of incident light same frequency be Rayleigh scattering light, Rayleigh scattering light counter stress is responsive, when having vibration, the external world will produce added losses to Rayleigh scattering signal, cause the variation of light intensity, the position can release event occurring by monitoring light intensity, thus position.Based on OTDR technology, by measuring scattering pulse, return to the mistiming △ t that incident end and laser pulse set out and calculate the position L of vibration
x, its expression formula is:
The present invention compared with prior art, has following beneficial effect:
The present invention adopts a set of light path system, has realized the long synchronous sensing apart from temperature and vibration, greatly reduces cost; Adopt the thermally sensitive characteristic of Raman light, monitor temperature and variation thereof; Adopt Rayleigh coherent detection technology, there is higher vibration detection sensitivity; Adopt Rayleigh scattering signal counter stress sensitivity characteristic, identify vibration position, realized the position probing to intrusion event.
accompanying drawing explanation:
Accompanying drawing 1 is the structural representation of fiber optic temperature vibration transducer in the present invention.
Accompanying drawing 2 is structural representations of comprehensive monitoring system in the present invention.
Accompanying drawing 3 is fiber optic temperature vibration transducers and adopt the structural representation of the comprehensive monitoring system of this sensor in the embodiment of the present invention 2.
Accompanying drawing 4 is structural representations of data acquisition unit of the present invention.
Reference numeral: pulse optical fiber 1, 2*2 coupling mechanism 2, fibre delay line 3, wavelength division multiplexer 4, the first sensor fibre 5, anti-Stokes signal photoelectricity receiver module 6 dorsad, Stokes signal photoelectricity receiver module 7 dorsad, Rayleigh scattering signal photoelectricity receiver module 8, coherent light signal photoelectricity receiver module 9, data acquisition unit 10, industrial computer 11, image intensifer 12, semiconductor laser 13, optical receiving circuit 14 dorsad, accumulation process circuit 15, interval Acquisition Circuit 16, pulsed triggering circuit 17, upload circuit 18, the second sensor fibre 19.
embodiment:
Below in conjunction with drawings and Examples, the present invention is further illustrated.
As shown in Figure 1, the present invention proposes a kind of fiber optic temperature vibration transducer, be provided with thermometric loop, the relevant loop of vibration and location determination loop, it is characterized in that comprising pulsed laser 1, the 2*2 photo-coupler 2 being connected with pulsed laser 1 output terminal, the first sensor fibre 5 being connected through fibre delay line 3 with 2*2 photo-coupler 2 Yi road output terminals, the wavelength division multiplexer 4 that input end is connected with second output terminal of 2*2 photo-coupler 2, the second sensor fibre 19 being connected with the COM end of wavelength division multiplexer 4, the anti-Stokes of the Raman dorsad light signal of exporting for receiving the second sensor fibre 19 being successively connected with the output terminal of wavelength division multiplexer 4 respectively, the signal of the anti-Stokes dorsad photoelectricity receiver module 6 of Raman Stokes light signal and Rayleigh scattering signal dorsad, Stokes signal photoelectricity receiver module 7 dorsad, Rayleigh scattering signal photoelectricity receiver module 8, be connected with the output terminal of 2*2 photo-coupler 2 for receive by the two-way of the first sensor fibre 5 and the output of the second sensor fibre 19 dorsad Rayleigh scattering signal relevant after the coherent light signal photoelectricity receiver module 9 of signal, respectively with anti-Stokes signal photoelectricity receiver module 6 dorsad, Stokes signal photoelectricity receiver module 7 dorsad, the data acquisition unit 10 that the output terminal of Rayleigh scattering signal photoelectricity receiver module 8 and coherent light signal photoelectricity receiver module 9 is connected.
Light-pulse generator described in the present invention 1 is used to system that pulsed light is provided; Described 2*2 coupling mechanism 2 is for light-pulse generator being coupled into two-way sensor fibre, and the Rayleigh scattering signal producing in two-way optical fiber is concerned with; Fibre delay line 3 arrives the time of 2*2 coupling mechanism for the Rayleigh scattering signal of adjusting two-way sensor fibre and producing; Dorsad anti-Stokes signal photoelectricity receiver module 6, Stokes signal photoelectricity receiver module 7, Rayleigh scattering signal photoelectricity receiver module 8, coherent light signal photoelectricity receiver module 9 are converted to electric signal for Raman light, Rayleigh scattering signal and the Rayleigh coherent light that optical fiber is produced dorsad; Sensor fibre carries out sensor and the transmission medium of temperature and vibration detection as system; Data acquisition unit 10 is used to system that pulse triggering signal is provided, carries out Raman light, the collection of Rayleigh scattering signal and Rayleigh coherent light; Industrial computer 11 is for data analysis, determine optical fiber temperature along the line, whether invasion and invasion position etc. occur, its data acquisition unit 10 as shown in Figure 4, in described data acquisition unit, be provided with the optical receiving circuit dorsad 14 that input end is connected with the output terminal of the photoelectricity receiver module of backscattering stokes light, backscattering anti-Stokes light and Rayleigh scattering signal, with the accumulation process circuit 15 that optical signal receiving circuit 14 is connected dorsad, what be connected with accumulation process circuit 15 uploads circuit 18 for what accumulation process result is uploaded to industrial computer; Also be provided with input end and the interval Acquisition Circuit 16 that the output terminal of the photoelectricity receiver module of Rayleigh interfere is connected, what be connected with interval Acquisition Circuit 16 uploads circuit 18 for what interval image data result is uploaded to industrial computer; Also be provided with for sending the fixedly pulsed triggering circuit 17 of the pulse signal of repetition frequency to laser instrument 1, pulsed triggering circuit 17 is also connected with interval Acquisition Circuit 16 with optical signal receiving circuit 14.
In the present invention, the centre wavelength of pulse optical fiber 1 can be 1550nm, pulse width 10ns, repetition frequency 10KHz, peak power 20W, spectrum width 0.1nm; The centre wavelength of 2*2 fiber coupler 2 correspondences is 1550nm, and splitting ratio is 50:50, insertion loss <0.7dB; Corresponding wavelength division multiplexer 4 is by the anti Stokes scattering of the Raman dorsad light wideband filtered sheet of centre wavelength 1450nm, the Stokes ratio of Raman dorsad wideband filtered sheet and the Rayleigh scattered light filter plate of centre wavelength 1660nm, and the 1*2 coupling mechanism being connected with Rayleigh scattered light filter plate forms; Data acquisition unit 10 sampling rates are divided into 100MSPS and 10KSPS, and analog input channel number corresponding to 100MSPS sampling rate is that analog input channel number corresponding to 3,10KMSPS sampling rate is that 1, ADC precision is 12bits.
The route of firing ring described in the present invention pulsed laser, wavelength division multiplexer, the second sensor fibre, dorsad anti-Stokes photoelectricity receiver module, Stokes photoelectricity receiver module and data acquisition unit form dorsad; The relevant loop of described vibration is by pulsed laser, 2*2 coupling mechanism, fibre delay line, wavelength division multiplexer, the first sensor fibre, Rayleigh scattering signal photoelectricity receiver module and data acquisition unit form dorsad; Described location determination circuit is comprised of pulsed laser, wavelength division multiplexer, the first sensor fibre, the second sensor fibre, photoelectricity receiver module and data acquisition unit.
Data acquisition unit described in the present invention is receiving Raman stokes light dorsad, sample frequency and the pulse width of Raman anti-Stokes light and Rayleigh scattering signal signal receiving circuit have following relation: S dorsad
sf=100/X, in: S
sffor sample frequency, unit: MSPS, X is pulse width, unit is ns.
Data acquisition unit described in the present invention has following relation: S in the sample frequency and the pulse width that receive Rayleigh coherent light signal receiving circuit
rf=100/X, wherein: S
rffor sample frequency, unit: KSPS, X is pulse width, unit is ns.
Pulse width of the present invention and sensor repetition frequency and measuring distance have following relation: fs=100/X, Ls=100/X, wherein: f
sfor repetition frequency, unit: KHz, L
sfor measuring distance, unit is Km, and X is pulse width, and unit is ns.
As shown in Figure 2, the present invention also proposes the vibration integrated supervisory system of a kind of fiber optic temperature, the fiber optic temperature shock sensor that is provided with industrial computer 11 and is connected with industrial computer 11, it is characterized in that fiber optic temperature vibration transducer adopts said structure, data acquisition unit 10 is uploaded to industrial computer by the Raman scattering signal receiving, Rayleigh signal and Rayleigh coherent signal through usb bus through uploading circuit 18.
The present invention also proposes the using method of the vibration integrated supervisory system of a kind of fiber optic temperature, it is characterized in that comprising the following steps:
Step 1: data acquisition unit is to pulsed laser transmitted trigger pip, and trigger pulse laser instrument is exported pulsed light;
Step 2: the light signal of pulsed laser output is after 2*2 coupling mechanism, and 50% light enters the first sensor fibre through fibre delay line, another 50% light enters the second sensor fibre through the com of wavelength division multiplexer end;
Step 3: light signal enters after sensor fibre, the back scattering Raman light signal and the Rayleigh scattering signal that in the second sensor fibre, produce are divided into stokes light through wavelength division multiplexer, anti-Stokes light and Rayleigh scattering signal, by the corresponding photoelectricity receiver module being connected with wavelength division multiplexer, received respectively, Rayleigh scattering signal signal in the second sensor fibre enters 2*2 coupling mechanism Yi road input end simultaneously, the Rayleigh scattering signal producing in the first sensor fibre enters another road input end of 2*2 coupling mechanism through fibre delay line 3, the Rayleigh scattering signal that two-way optical fiber produces interferes at 2*2 coupling mechanism, the coherent light signal producing is received by coupled coherent light signal photoelectricity receiver module,
Step 4: optical receiving circuit dorsad in data acquisition unit receives electric signal that backscattering stokes light, backscattering anti-Stokes light and Rayleigh scattering signal produce and gathered by optical receiving circuit dorsad, and carry out accumulation process by accumulation process circuit, the output electrical signals of the Rayleigh interfere of exporting through 2*2 coupling mechanism in optical fiber is gathered by interval Acquisition Circuit, through accumulation process circuit and interval, adopts the data of circuit collection to be uploaded to industrial computer by the coupled circuit of uploading;
Step 5: industrial computer receives after the data of being uploaded by data acquisition unit, according to anti-Stokes to Stokes electrical signal intensity than the relation being directly proportional to temperature, host computer calculates the signal intensity on sensor fibre the temperature information at place, optical fiber present position, the phase differential producing according to invasion, whether by detecting the signal determining of interference signal, invade, according to the characteristic of Rayleigh scattering signal counter stress sensitivity, monitoring fiber stress changes, determine stress position, output invasion place.
In the present invention, thermometric loop obtains the temperature information in region to be measured according to following principle: when incident laser and optical fiber molecule generation nonlinear interaction scattering, emit a phonon and become Stokes ratio, absorbing a phonon becomes anti-Stokes Raman scattering photon, and the Phonon frequency of optical fiber molecule is 13.2THz.Boltzmann's law is obeyed in population heat distribution on fine molecular entergy level, strength ratio R (T) and the temperature correlation of anti-Stokes Raman diffused light and Stokes Raman diffused light, and its expression formula is:
，
Wherein: V
aS, V
sthe frequency that is respectively minute Stokes Raman scattering photon and Stokes Raman scattering photon, h is Planck's constant, and △ V is the Phonon frequency 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 optical fiber temperature-measurement of temperature and vibration and structural representation of vibration transducer simultaneously measured, as shown in Figure 1, data acquisition unit 10 mono-road pulse triggering signal output terminal is connected with the input end of pulse optical fiber 1, the 1550nm pulsed light of pulse optical fiber 1 output is connected with the 1550nm input end of 2*2 coupling mechanism 2, 2*2 coupling mechanism 2 Yi road output terminals are connected with the input end of fibre delay line 3, the output terminal of fibre delay line 3 is connected with a 5-a optical fiber of optical fiber 5, another road output terminal of 2*2 coupling mechanism 2 is connected with the 1550nm input end of wavelength division multiplexer 4, the com output terminal of wavelength division multiplexer 4 and the second sensor fibre, the Rayleigh scattering signal lease making fibre delay line 3 producing in the first sensor fibre enters 2*2 coupling mechanism 2 Yi road input ends, the anti-Stokes of Raman dorsad producing in the second sensor fibre, stokes scattering signal divides from the 1450nm of wavelength division multiplexer 4 and the output of 1660nm output port, and respectively at photoelectricity receiver module 8, the input end of photoelectricity receiver module 9 is connected, the Rayleigh scattering signal producing in the second sensor fibre is connected with another road input end of photoelectricity receiver module 7 and 2*2 coupling mechanism 2 after wavelength division multiplexer 4, article two, the Rayleigh scattering signal that optical fiber produces is connected with the input end of photoelectricity receiver module 6 after 2*2 coupling mechanism 2 produces interference, photoelectricity receiver module 6, photoelectricity receiver module 7, photoelectricity receiver module 8 is connected with 4 road input ends of data acquisition unit 10 with photoelectricity receiver module 9.
Fig. 2 measures optical fiber temperature-measurement and the vibration transducer of temperature and vibration and adopts the structural representation of the comprehensive monitoring system of this sensor when being the embodiment of the present invention, comprise industrial computer 11 and optical fiber temperature-measurement and vibration transducer, data acquisition unit 10 in optical fiber temperature-measurement and vibration transducer is connected with industrial computer 11, data acquisition unit 10 is by the Raman scattering signal receiving, Rayleigh signal and Rayleigh coherent signal are uploaded to industrial computer 11 through usb bus, wherein said optical fiber temperature-measurement and vibration transducer adopt above-mentioned a kind of optical fiber temperature-measurement and vibration transducer that is applicable to simultaneously measure temperature and vibration.
In the present embodiment, light source adopts pulse optical fiber 1, described pulse optical fiber, and centre wavelength is 1550nm, pulse width 10ns, repetition frequency 10KHz, peak power 20W, spectrum width 0.1nm.
In the present embodiment, described 2*2 coupling mechanism 2, centre wavelength 1550nm, splitting ratio is 50:50, insertion loss <0.7dB.
In the present embodiment, described wavelength division multiplexer 4, by the anti Stokes scattering of the Raman dorsad light wideband filtered sheet of centre wavelength 1450nm, the Stokes ratio of Raman dorsad wideband filtered sheet and the Rayleigh scattered light filter plate of centre wavelength 1660nm, and the 1*2 coupling mechanism being connected with Rayleigh scattered light filter plate forms, described 1*2 coupling mechanism splitting ratio is 50:50, insertion loss <0.7dB.
In the present embodiment, described data acquisition unit 10, sampling rate is divided into 100MSPS and 10KSPS, and analog input channel number corresponding to 100MSPS sampling rate is that analog input channel number corresponding to 3,10KMSPS sampling rate is that 1, ADC precision is 12bits.
embodiment 2:
The present embodiment provides another optical fiber temperature-measurement of simultaneously measuring temperature and vibration and vibration transducer and adopts the comprehensive monitoring system of this sensor, its structural representation as shown in Figure 3, with optical fiber temperature-measurement and the vibration transducer of Fig. 2 structure and adopt the comprehensive monitoring system of this sensor, difference is: light source adopts semiconductor laser 13 to add image intensifer 12 and realizes, the pulse triggering signal of exporting by data acquisition unit 10 drives semiconductor laser 13 to realize miniwatt pulsed optical signals, miniwatt pulsed light is exported powerful pulsed light after image intensifer 12, this mode has lowered the restriction to light source power, there is the feature that cost is low simultaneously.
In the present embodiment, described semiconductor laser 13, centre wavelength is 1550nm, threshold current 10mA, thermistor 10kohm, spectrum width 0.1nm, power 15mW.
In the present embodiment, described image intensifer 12, amplification pulse width is 1-2us, and repetition frequency is 4-10kHz, and peak power is 1-10W, extinction ratio 40dB.
What the embodiment of the present invention was announced is preferred embodiments; but its concrete enforcement is not limited to this; those of ordinary skill in the art is very easily according to above-described embodiment; understand spirit of the present invention; and make different amplifications and variation; only otherwise depart from spirit of the present invention, within all belonging to protection scope of the present invention.
Claims (8)
1. a fiber optic temperature vibration transducer, be provided with thermometric loop, the relevant loop of vibration and location determination loop, it is characterized in that comprising and be provided with thermometric loop, the relevant loop of vibration and location determination loop, it is characterized in that comprising pulsed laser, the 2*2 photo-coupler being connected with pulsed laser output terminal, the first sensor fibre being connected through fibre delay line with 2*2 photo-coupler Yi road output terminal, second wavelength division multiplexer that output terminal is connected of input end and 2*2 photo-coupler, the second sensor fibre being connected with the COM end of wavelength division multiplexer, the anti-Stokes of the Raman dorsad light signal of exporting for receiving the second sensor fibre being successively connected with the output terminal of wavelength division multiplexer respectively, the signal of the anti-Stokes dorsad photoelectricity receiver module of Raman Stokes light signal and Rayleigh scattering signal dorsad, Stokes signal photoelectricity receiver module dorsad, Rayleigh scattering signal photoelectricity receiver module, be connected with the output terminal of 2*2 photo-coupler for receive by the two-way of the first sensor fibre and the second sensor fibre output dorsad Rayleigh scattering signal relevant after the coherent light signal photoelectricity receiver module of signal, respectively with anti-Stokes signal photoelectricity receiver module dorsad, Stokes signal photoelectricity receiver module dorsad, the data acquisition unit that the output terminal of Rayleigh scattering signal photoelectricity receiver module and coherent light signal photoelectricity receiver module is connected.
2. a kind of fiber optic temperature vibration transducer according to claim 1, it is characterized in that being provided with for receiving anti-Stokes signal photoelectricity receiver module dorsad in described data acquisition unit, Stokes signal photoelectricity receiver module dorsad, the optical receiving circuit dorsad of the electric signal of Rayleigh scattering signal photoelectricity receiver module output, output terminal respectively with pulsed laser, optical receiving circuit dorsad, and the pulsed triggering circuit that is connected of interval Acquisition Circuit, the interval Acquisition Circuit that input end is connected with coherent light signal photoelectricity receiver module, with the accumulation process circuit that optical receiving circuit output terminal is connected dorsad, and respectively with accumulation process circuit, interval Acquisition Circuit is connected uploads circuit.
3. a kind of fiber optic temperature vibration transducer according to claim 1, the centre wavelength that it is characterized in that pulse optical fiber is 1550nm, pulse width 10ns, repetition frequency 10KHz, peak power 20W, spectrum width 0.1nm; 2*2 fiber coupler, corresponding centre wavelength is 1550nm, splitting ratio is 50:50, insertion loss <0.7dB; Corresponding wavelength division multiplexer is by the anti Stokes scattering of the Raman dorsad light wideband filtered sheet of centre wavelength 1450nm, the Stokes ratio of Raman dorsad wideband filtered sheet and the Rayleigh scattered light filter plate of centre wavelength 1660nm, and the 1*2 coupling mechanism being connected with Rayleigh scattered light filter plate forms; Data acquisition unit, sampling rate is divided into 100MSPS and 10KSPS, and analog input channel number corresponding to 100MSPS sampling rate is that analog input channel number corresponding to 3,10KMSPS sampling rate is that 1, ADC precision is 12bits.
4. a kind of fiber optic temperature vibration transducer according to claim 1, is characterized in that described data acquisition unit is receiving Raman stokes light dorsad, sample frequency and the pulse width of Raman anti-Stokes light and Rayleigh scattering signal signal receiving circuit have following relation: S dorsad
sf=100/X, in: S
sffor sample frequency, unit: MSPS, X is pulse width, unit is ns.
5. a kind of fiber optic temperature vibration transducer according to claim 1, is characterized in that described data acquisition unit has following relation: S in the sample frequency and the pulse width that receive Rayleigh coherent light signal receiving circuit
rf=100/X, wherein: S
rffor sample frequency, unit: KSPS, X is pulse width, unit is ns.
6. a kind of fiber optic temperature vibration transducer according to claim 1, is characterized in that pulse width and sensor repetition frequency and measuring distance have following relation: fs=100/X, Ls=100/X, wherein: f
sfor repetition frequency, unit: KHz, L
sfor measuring distance, unit is Km, and X is pulse width, and unit is ns.
7. the vibration integrated supervisory system of fiber optic temperature, the fiber optic temperature shock sensor that is provided with industrial computer and is connected with industrial computer, it is characterized in that fiber optic temperature vibration transducer is for as described in any one in claim 1-6, data acquisition unit is uploaded to industrial computer by the Raman scattering signal receiving, Rayleigh signal and Rayleigh coherent signal through usb bus through uploading circuit.
8. a using method for the vibration integrated supervisory system of fiber optic temperature as claimed in claim 7, is characterized in that comprising the following steps:
Step 1: data acquisition unit is to pulsed laser transmitted trigger pip, and trigger pulse laser instrument is exported pulsed light;
Step 2: the light signal of pulsed laser output is after 2*2 coupling mechanism, and 50% light enters the first sensor fibre through fibre delay line, another 50% light enters the second sensor fibre through the com of wavelength division multiplexer end;
Step 3: light signal enters after sensor fibre, the back scattering Raman light signal and the Rayleigh scattering signal that in the second sensor fibre, produce are divided into stokes light through wavelength division multiplexer, anti-Stokes light and Rayleigh scattering signal, by the corresponding photoelectricity receiver module being connected with wavelength division multiplexer, received respectively, Rayleigh scattering signal signal in the second sensor fibre enters 2*2 coupling mechanism Yi road input end simultaneously, the Rayleigh scattering signal producing in the first sensor fibre enters another road input end of 2*2 coupling mechanism through fibre delay line 3, the Rayleigh scattering signal that two-way optical fiber produces interferes at 2*2 coupling mechanism, the coherent light signal producing is received by coupled coherent light signal photoelectricity receiver module,
Step 4: optical receiving circuit dorsad in data acquisition unit receives electric signal that backscattering stokes light, backscattering anti-Stokes light and Rayleigh scattering signal produce and gathered by optical receiving circuit dorsad, and carry out accumulation process by accumulation process circuit, the output electrical signals of the Rayleigh interfere of exporting through 2*2 coupling mechanism in optical fiber is gathered by interval Acquisition Circuit, through accumulation process circuit and interval, adopts the data of circuit collection to be uploaded to industrial computer by the coupled circuit of uploading;
Step 5: industrial computer receives after the data of being uploaded by data acquisition unit, according to anti-Stokes to Stokes electrical signal intensity than the relation being directly proportional to temperature, host computer calculates the signal intensity on sensor fibre the temperature information at place, optical fiber present position, the phase differential producing according to invasion, whether by detecting the signal determining of interference signal, invade, according to the characteristic of Rayleigh scattering signal counter stress sensitivity, monitoring fiber stress changes, determine stress position, output invasion place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310641014.7A CN103616089B (en) | 2013-12-04 | 2013-12-04 | A kind of optical fiber temperature vibration sensor and comprehensive monitoring system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310641014.7A CN103616089B (en) | 2013-12-04 | 2013-12-04 | A kind of optical fiber temperature vibration sensor and comprehensive monitoring system and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103616089A true CN103616089A (en) | 2014-03-05 |
| CN103616089B CN103616089B (en) | 2017-10-13 |
Family
ID=50166795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310641014.7A Active CN103616089B (en) | 2013-12-04 | 2013-12-04 | A kind of optical fiber temperature vibration sensor and comprehensive monitoring system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103616089B (en) |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104792342A (en) * | 2015-04-17 | 2015-07-22 | 安徽师范大学 | Distributed optical fiber sensing device with two parameter measuring functions |
| CN105135215A (en) * | 2015-06-26 | 2015-12-09 | 中国石油化工股份有限公司胜利油田分公司 | Leakage detection device for oil collecting pipeline with optical fiber method |
| CN106768278A (en) * | 2017-01-06 | 2017-05-31 | 天津大学 | A kind of distributed optical fiber vibration and the double physical quantity sensing positioning systems of temperature |
| CN107238415A (en) * | 2017-07-27 | 2017-10-10 | 中国地质大学（武汉） | For detecting the temperature of fully distributed fiber and the sensor of vibration position |
| CN108982516A (en) * | 2018-07-16 | 2018-12-11 | 中国科学院合肥物质科学研究院 | A kind of distribution type fiber-optic sack cleaner leak-off pocket locating and detecting device and its method |
| CN110793616A (en) * | 2019-10-25 | 2020-02-14 | 深圳第三代半导体研究院 | All-fiber distributed cable safety and reliability monitoring system |
| CN111127793A (en) * | 2019-12-25 | 2020-05-08 | 深圳供电局有限公司 | Cable anti-theft monitoring method and system, computer readable storage medium |
| CN111141412A (en) * | 2019-12-25 | 2020-05-12 | 深圳供电局有限公司 | Cable temperature and anti-theft dual-monitoring method and system and readable storage medium |
| CN111323144A (en) * | 2020-03-27 | 2020-06-23 | 武汉理工大学 | Distributed optical fiber sensing system for simultaneously measuring temperature, strain and vibration |
| CN113624363A (en) * | 2021-08-02 | 2021-11-09 | 太原理工大学 | Optical fiber temperature monitoring device |
| CN113654684A (en) * | 2021-08-17 | 2021-11-16 | 国网上海市电力公司 | Superconducting cable vibration and temperature measurement system and method adaptive to multiple vibration working conditions |
| CN113721287A (en) * | 2021-07-16 | 2021-11-30 | 西北大学 | Monitoring method and device based on sensing optical fiber |
| CN114026393A (en) * | 2019-01-30 | 2022-02-08 | 沙特阿拉伯石油公司 | Hybrid distributed acoustic testing |
| CN114076634A (en) * | 2020-08-21 | 2022-02-22 | 中国石油天然气股份有限公司 | Sensing system of distributed optical fiber |
| CN114495388A (en) * | 2021-11-18 | 2022-05-13 | 河南顺博建筑智能化工程有限公司 | Perimeter security system |
| CN115789531A (en) * | 2022-11-07 | 2023-03-14 | 吉林大学 | Submarine pipeline leakage monitoring system and method |
| US12019200B2 (en) | 2019-03-12 | 2024-06-25 | Saudi Arabian Oil Company | Downhole monitoring using few-mode optical fiber based distributed acoustic sensing |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56111434A (en) * | 1980-02-08 | 1981-09-03 | Toshiba Corp | Thermal vibration detecting and suppressing device |
| CN202041323U (en) * | 2011-03-29 | 2011-11-16 | 宁波诺驰光电科技发展有限公司 | Distributed multi-parameter optical fiber sensor |
| CN102506912A (en) * | 2011-09-29 | 2012-06-20 | 北京航空航天大学 | Optical fiber distributed disturbance sensor |
| CN102636217A (en) * | 2012-01-09 | 2012-08-15 | 宋牟平 | Sensing device based on joint detection of Brillouin optical time domain analysis and Mach-Zehnder interference |
| KR20120127156A (en) * | 2011-05-12 | 2012-11-21 | 한국과학기술원 | A fiber optic sensor using transmissive grating panel and mirror |
| CN103344314A (en) * | 2013-06-15 | 2013-10-09 | 威海北洋电气集团股份有限公司 | M-Z optical fiber vibration sensing system and fiber breakage detection method thereof |
| CN203572595U (en) * | 2013-12-04 | 2014-04-30 | 威海北洋电气集团股份有限公司 | Optical fiber temperature and vibration sensor and comprehensive monitoring device |
-
2013
- 2013-12-04 CN CN201310641014.7A patent/CN103616089B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56111434A (en) * | 1980-02-08 | 1981-09-03 | Toshiba Corp | Thermal vibration detecting and suppressing device |
| CN202041323U (en) * | 2011-03-29 | 2011-11-16 | 宁波诺驰光电科技发展有限公司 | Distributed multi-parameter optical fiber sensor |
| KR20120127156A (en) * | 2011-05-12 | 2012-11-21 | 한국과학기술원 | A fiber optic sensor using transmissive grating panel and mirror |
| CN102506912A (en) * | 2011-09-29 | 2012-06-20 | 北京航空航天大学 | Optical fiber distributed disturbance sensor |
| CN102636217A (en) * | 2012-01-09 | 2012-08-15 | 宋牟平 | Sensing device based on joint detection of Brillouin optical time domain analysis and Mach-Zehnder interference |
| CN103344314A (en) * | 2013-06-15 | 2013-10-09 | 威海北洋电气集团股份有限公司 | M-Z optical fiber vibration sensing system and fiber breakage detection method thereof |
| CN203572595U (en) * | 2013-12-04 | 2014-04-30 | 威海北洋电气集团股份有限公司 | Optical fiber temperature and vibration sensor and comprehensive monitoring device |
Non-Patent Citations (1)
| Title |
|---|
| 曾祥楷等: "光纤应变、温度、振动同时测量新技术的研究", 《光子学报》 * |
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104792342A (en) * | 2015-04-17 | 2015-07-22 | 安徽师范大学 | Distributed optical fiber sensing device with two parameter measuring functions |
| CN105135215A (en) * | 2015-06-26 | 2015-12-09 | 中国石油化工股份有限公司胜利油田分公司 | Leakage detection device for oil collecting pipeline with optical fiber method |
| CN106768278B (en) * | 2017-01-06 | 2020-07-31 | 天津大学 | Distributed optical fiber vibration and temperature dual-physical quantity sensing and positioning system |
| CN106768278A (en) * | 2017-01-06 | 2017-05-31 | 天津大学 | A kind of distributed optical fiber vibration and the double physical quantity sensing positioning systems of temperature |
| CN107238415A (en) * | 2017-07-27 | 2017-10-10 | 中国地质大学（武汉） | For detecting the temperature of fully distributed fiber and the sensor of vibration position |
| CN108982516A (en) * | 2018-07-16 | 2018-12-11 | 中国科学院合肥物质科学研究院 | A kind of distribution type fiber-optic sack cleaner leak-off pocket locating and detecting device and its method |
| CN114026393A (en) * | 2019-01-30 | 2022-02-08 | 沙特阿拉伯石油公司 | Hybrid distributed acoustic testing |
| US12019200B2 (en) | 2019-03-12 | 2024-06-25 | Saudi Arabian Oil Company | Downhole monitoring using few-mode optical fiber based distributed acoustic sensing |
| CN110793616A (en) * | 2019-10-25 | 2020-02-14 | 深圳第三代半导体研究院 | All-fiber distributed cable safety and reliability monitoring system |
| CN111127793A (en) * | 2019-12-25 | 2020-05-08 | 深圳供电局有限公司 | Cable anti-theft monitoring method and system, computer readable storage medium |
| CN111141412A (en) * | 2019-12-25 | 2020-05-12 | 深圳供电局有限公司 | Cable temperature and anti-theft dual-monitoring method and system and readable storage medium |
| CN111323144A (en) * | 2020-03-27 | 2020-06-23 | 武汉理工大学 | Distributed optical fiber sensing system for simultaneously measuring temperature, strain and vibration |
| CN114076634A (en) * | 2020-08-21 | 2022-02-22 | 中国石油天然气股份有限公司 | Sensing system of distributed optical fiber |
| CN113721287B (en) * | 2021-07-16 | 2024-03-01 | 西北大学 | Monitoring method and device based on sensing optical fiber |
| CN113721287A (en) * | 2021-07-16 | 2021-11-30 | 西北大学 | Monitoring method and device based on sensing optical fiber |
| CN113624363A (en) * | 2021-08-02 | 2021-11-09 | 太原理工大学 | Optical fiber temperature monitoring device |
| CN113624363B (en) * | 2021-08-02 | 2024-05-03 | 太原理工大学 | Optical fiber temperature monitoring device |
| CN113654684A (en) * | 2021-08-17 | 2021-11-16 | 国网上海市电力公司 | Superconducting cable vibration and temperature measurement system and method adaptive to multiple vibration working conditions |
| CN114495388A (en) * | 2021-11-18 | 2022-05-13 | 河南顺博建筑智能化工程有限公司 | Perimeter security system |
| CN115789531A (en) * | 2022-11-07 | 2023-03-14 | 吉林大学 | Submarine pipeline leakage monitoring system and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103616089B (en) | 2017-10-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103616089B (en) | A kind of optical fiber temperature vibration sensor and comprehensive monitoring system and method | |
| CN107917738B (en) | Distributed optical fiber sensing system capable of simultaneously measuring temperature, strain and vibration | |
| CN203572595U (en) | Optical fiber temperature and vibration sensor and comprehensive monitoring device | |
| CN203605976U (en) | Distributed type optical fiber temperature and stress sensing device | |
| CN102937416B (en) | A kind of fully distributed fiber switched based on orthogonal polarisation state strains and vibration sensing method and device | |
| CN102829807B (en) | BOTDA (Brillouin Optical Time Domain Analyzer) and POTDR (Polarization Optical Time Domain Reflectometer) combined distributed type optical fiber sensing system | |
| CN103616091B (en) | A kind of distributed fiber optic temperature and stress sensing device | |
| CN109595470B (en) | Distributed pipeline detection method | |
| CN102607621A (en) | Distributed optical fiber Brillouin sensing device and method thereof for detecting temperature and strain synchronously | |
| CN204087417U (en) | Temperature detected by optical fiber fire detector system | |
| CN104964699A (en) | Disturbance determining method and apparatus based on phi-OTDR fiber distributed type disturbance sensor | |
| Liu et al. | Application of distributed optical fiber temperature sensing system based on Raman scattering in coal mine safety monitoring | |
| CN100538311C (en) | Use the method that the subcarrier technology improves performance of distributed sensing system | |
| CN104614091B (en) | All -fiber long range high spatial resolution single photon temperature sensor | |
| CN102853936A (en) | Remote distributed fiber Raman temperature sensor | |
| CN104361707A (en) | Fiber-optic temperature-sensing fire detector system | |
| CN102445285B (en) | Peak searching method of Brillouin optical time domain reflectometer (BOTDR) system | |
| CN107727122B (en) | Double-end detection combined Raman and Brillouin scattering distributed optical fiber sensing device | |
| CN104729751A (en) | Distributed optical fiber temperature and stress sensor based on Brillouin scattering | |
| CN102620861B (en) | Scaling temperature measuring device in distributed optical fiber temperature sensor | |
| Datta et al. | Challenges and opportunities in distributed anti-Stokes Raman thermometry | |
| CN203772449U (en) | Fiber temperature-measuring tape with high spatial resolution | |
| CN107631814B (en) | Optical self-coherent sensing optical path structure, frequency shift change detection method and sensing device | |
| CN202433122U (en) | Distributed intelligent power grid optical fiber temperature measurement system | |
| CN205263987U (en) | Boats and ships cabin monitoring fire alarm device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |