CN102589459A - Fully-distributed optical fiber sensor in combination of optical fiber Raman frequency shifter and Raman amplifier - Google Patents

Fully-distributed optical fiber sensor in combination of optical fiber Raman frequency shifter and Raman amplifier Download PDF

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Publication number
CN102589459A
CN102589459A CN2012100388287A CN201210038828A CN102589459A CN 102589459 A CN102589459 A CN 102589459A CN 2012100388287 A CN2012100388287 A CN 2012100388287A CN 201210038828 A CN201210038828 A CN 201210038828A CN 102589459 A CN102589459 A CN 102589459A
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fiber
raman
optical fiber
laser
sensor
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张在宣
康娟
张文平
李晨霞
余向东
王剑锋
张文生
金尚忠
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China Jiliang University
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China Jiliang University
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infra-red, visible, or ultra-violet light
    • G01D5/32Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infra-red, visible, or ultra-violet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infra-red, visible, or ultra-violet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infra-red, visible, or ultra-violet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
    • G01D5/35338Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infra-red, visible, or ultra-violet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using other arrangements than interferometer arrangements
    • G01D5/35354Sensor working in reflection
    • G01D5/35358Sensor working in reflection using backscattering to detect the measured quantity
    • G01D5/35364Sensor working in reflection using backscattering to detect the measured quantity using inelastic backscattering to detect the measured quantity, e.g. using Brillouin or Raman backscattering
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infra-red, visible, or ultra-violet light
    • G01D5/32Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infra-red, visible, or ultra-violet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infra-red, visible, or ultra-violet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infra-red, visible, or ultra-violet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
    • G01D5/3537Optical fibre sensor using a particular arrangement of the optical fibre itself
    • G01D5/3538Optical fibre sensor using a particular arrangement of the optical fibre itself using a particular type of fiber, e.g. fibre with several cores, PANDA fiber, fiber with an elliptic core or the like

Abstract

The invention discloses a fully-distributed optical fiber sensor in combination of an optical fiber Raman frequency shifter and a Raman amplifier. After shifting frequency for 13.2 THz by the optical fiber Raman frequency shifter, an optical fiber pulsing laser produces a broad spectrum Raman laser with a 1660nm wave band, wherein the broad spectrum Raman laser is served as the broad spectrum light source of the fully-distributed optical fiber sensor for performing the incidence of a sensing fiber; the deformation and the breaking of the optical fiber can be detected based on the reverse Rayleigh scattering strength ratio of the sensing fiber; the 1550nm wave band produced in the sensing fiber undergoes reverse anti-Stokes Raman scattering and is amplified by the optical fiber Raman amplifier; the temperature information at each section of the optical fiber can be obtained by deducting the influence produced by straining according to the strength ratio of the anti-Stokes Raman scattered light to the Rayleigh scattered light; the inspection on the training and the temperature is out of cross effect; the detection point on the sensing fiber can be located by using an optical time domain reflection technology. The fully-distributed optical fiber sensor is applied to the monitoring of petrochemical pipes, tunnels and large-scale civil engineering within ultra-long range of 100 kilometers, as well as disaster prediction monitoring.

Description

Merge the fully distributed fiber sensor of fiber Raman frequency shifter and raman amplifier
Technical field
The present invention relates to the Fibre Optical Sensor field, relate in particular to a kind of distributed fiber Rayleigh and Raman scattering photon strain, temperature sensor.
Background technology
The optical fiber sensor network that development in recent years is got up can realize that safety and Health such as large scale civil engineering, power engineering, petrochemical industry, traffic bridge, tunnel, subway station, dam, embankment and Mineral Engineering are monitored and the forecast and the monitoring of disaster.Fibre Optical Sensor has two big types: one type be with fiber grating (FBG) and optical Fiber Method in vain point sensors " extension " (laying) such as (F-P) on optical fiber; The quasi-distributed optical fiber sensor network that adopts the light time field technique to form; The subject matter of quasi-distributed optical fiber sensor network is that the optical fiber between point sensor only is transmission medium, thereby has detection " blind area "; The another kind of intrinsic property that utilizes optical fiber, fiber Rayleigh, Raman and Brillouin scattering effect, the full distribution optical fiber sensor net that adopts light time territory (OTDR) technology to form is measured strain and temperature.Optical fiber in the full distribution optical fiber sensor net be transmission medium be again sensor information, do not exist and detect the blind area.
" fully distributed fiber Rayleigh and Raman scattering photon strain, temperature sensor " (Chinese invention patent that Zhang Zaixuan proposes; The patent No.: 200910099463.7; Authorized on September 29th, 2010) provide a kind of simple in structure, signal to noise ratio (S/N ratio) good; The distributed fiber Rayleigh of good reliability and Raman scattering photon strain, temperature sensor are in being applicable to, the sensing range of short distance 0-15km fully distributed fiber sensing net.But can not satisfy the safety and Health monitoring of petroleum pipe line, transferring electric power cable in recent years fully, to the active demand of long-range, very-long-range fully distributed fiber Rayleigh, Raman and Brillouin scattering strain, TEMP net.
Summary of the invention
The objective of the invention is deficiency to prior art; A kind of fully distributed fiber sensor that merges fiber Raman frequency shifter and raman amplifier is provided, the present invention be simple in structure, signal to noise ratio (S/N ratio) good, the very-long-range 100km distributed fiber Rayleigh of good reliability and Raman scattering photon strain, temperature sensor.
The objective of the invention is to realize through following technical scheme: a kind of fully distributed fiber sensor that merges fiber Raman frequency shifter and raman amplifier, comprise fiber pulse laser, the fiber Raman frequency shifter is made up of single-mode fiber and 1660nm laser sheet; Optical fibre wavelength division multiplexer, fiber coupler, fibre optic Raman laser; Sensor fibre; The optical fiber narrow band reflective filter, photoelectricity receiver module, digital signal processor and industrial computer.Fiber pulse laser sends laser and gets into the fiber Raman frequency shifter; Through frequency displacement 13.2THz to the 1660nm wave band; Get into optical fibre wavelength division multiplexer as broad spectrum light source laser; Optical fibre wavelength division multiplexer has four ports, and its input port links to each other with fiber Raman frequency shifter output port, and the COM output port links to each other with sensor fibre with fiber coupler through the optical fiber narrow band reflective filter; Fibre optic Raman laser; Fiber coupler and sensor fibre are formed the C-band fiber Raman amplifier; The reverse Rayleigh scattering light of 1660nm wide waveband spectrum that in sensor fibre, produces links to each other with an input port of photoelectricity receiver module through an output port of 1450nm optical fiber narrow band reflective filter and optical fibre wavelength division multiplexer, a port of supplied with digital signal processor after opto-electronic conversion is amplified; In sensor fibre, produce; The reverse anti-Stokes Raman diffused light of 1550nm wide waveband spectrum that amplifies through raman amplifier links to each other with another input port of photoelectricity receiver module through another output port of 1450nm optical fiber narrow band reflective filter and optical fibre wavelength division multiplexer; Another port of supplied with digital signal processor after opto-electronic conversion is amplified, digital signal processor links to each other with industrial computer.Through digital signal processor and industrial computer demodulation; Utilize fiber Rayleigh scattering intensity to receive the principle of fibre strain modulation; The deformation of detection fiber and fracture, the principle based on optical fiber anti-Stokes Raman light intensity is modulated by fiber optic temperature adopts optical fiber anti-Stokes Raman light intensity and fiber Rayleigh scattering light strength ratio detection fiber temperature; And the influence of deduction strain, there is not cross effect each other.
The very-long-range fully distributed fiber sensor of described fusion fiber Raman frequency shifter; The centre wavelength that it is characterized in that high power pulsed laser is 1550nm; Spectral width is 0.1nm; Laser pulse width is that 10-30ns is adjustable, and peak power is that 1-1kW is adjustable, and repetition frequency is that 500Hz-800Hz is adjustable.
The very-long-range fully distributed fiber sensor of described fusion fiber Raman frequency shifter; It is characterized in that adopting the fiber Raman frequency shifter; It is made up of 1km single-mode fiber and 1660nm bandpass filter, and optical filter centre wavelength is 1660nm, spectral bandwidth 28nm; Transmitance 98% is to the isolation of 1550nm laser>45dB.
The fiber Raman frequency shifter to the 1660nm wave band, and has been widened the spectral bandwidth of laser with 1550nm band of light fibre laser frequency displacement 13.2THz, as the broad spectrum light source of fully distributed fiber sensor.
Described fusion fiber Raman frequency shifter, the fully distributed fiber sensor of raman amplifier is characterized in that optical fibre wavelength division multiplexer, it has 1660nm laser input port, COM output port, four ports such as 1550nm output port and 1660nm output port.
Described fusion fiber Raman frequency shifter, the fully distributed fiber sensor of raman amplifier is characterized in that an end of fiber coupler links to each other with fibre optic Raman laser, two ends link to each other with the optical fiber narrow band reflective filter with sensor fibre respectively in addition.
Described fusion fiber Raman frequency shifter; The fully distributed fiber sensor of raman amplifier; The centre wavelength that it is characterized in that fibre optic Raman laser is 1450.0nm, spectral bandwidth 0.1nm, and output power 100-1200mW is adjustable; By fiber coupler, fibre optic Raman laser and sensor fibre constitute the C-band fiber Raman amplifier.
Described fusion fiber Raman frequency shifter, the fully distributed fiber sensor of raman amplifier is characterized in that sensor fibre adopts 100km communication with G652 single-mode fiber or LEAF optical fiber, special occasions adopts carbon to apply single-mode fiber.
It is a kind of in drawing process that carbon applies single-mode fiber, the special fiber of deposition one deck agraphitic carbon on the bare fibre surface.The technology that this carbon sealing applies has solved optical fiber because the physical strength that static fatigue causes descends, and because hydrogen diffuses into the long-term integrity problems such as loss increase that cause in the quartz glass body.This carbon coated fiber can be in the medium-term and long-term reliable work of harsh rugged environment.The carbon coated fiber is that the cladding surface at optical fiber adds the thick fine and close carbon film of one deck 35~70nm, and then applies one deck ultra-violet curing organic coating, and fine and close carbon film can strengthen under rugged surroundings the protection to bare fibre greatly; Ensure its permanance, sensor fibre is laid on the scene, and this optical fiber is not charged; Anti-electromagnetic interference (EMI), radiation hardness, corrosion-resistant; Good reliability, optical fiber be transmission medium be again sensor information.
Described fusion fiber Raman frequency shifter, the fully distributed fiber sensor of raman amplifier is characterized in that the centre wavelength of optical fiber narrow band reflective filter is 1450.0nm, spectral bandwidth 0.5nm, reflectivity 99%.
Described fusion fiber Raman frequency shifter; The fully distributed fiber sensor of raman amplifier is characterized in that the photoelectricity receiver module adopts InGaAs photoelectricity avalanche diode and low noise broadband prime amplifier integrated chip MAX4107 and three grades of main amplifiers compositions of two-way low noise.
Fiber Raman frequency shifter principle of work:
As incident laser ν 0Produce the nonlinear interaction scattering with the optical fiber molecule, emit a phonon and be called the Stokes Raman scattering photon, absorb a phonon and be called anti-Stokes Raman scattering photon Δ ν, the phonon frequency of optical fiber molecule is 13.2THz, incident laser ν 0, produced frequency displacement:
ν=ν 0±Δν ; (1)
Be called the fiber Raman frequency displacement, can be made into the fiber Raman frequency shifter.If incident laser surpasses certain threshold value, the stokes wave ν=ν in optical fiber 0-Δ ν increases in fiber medium fast, and the power of most of pump light can convert stokes light to, and this stimulated Raman scattering phenomenon becomes the principle of work of fiber Raman frequency shifter.It can form 1550nm fiber pulse laser and 1660nm bandpass filter the fiber Raman frequency shifter by the 1km single-mode fiber, converts 1550nm optical fiber pulse laser into 1660nm wide waveband spectrum raman laser.
The distributed optical fiber Raman amplifier principle of work
The turn off gain of amplifier is:
; (2)
Wherein, is the pump light power input of amplifier; is that Raman gain coefficienct is the free area of optical fiber; is the effective interaction length of optical fiber (having considered the absorption loss of optical fiber to pumping), and its expression formula is following:
; (3)
For fiber Raman amplifier, pump power has only when surpassing a certain threshold value, just might produce excited Raman to signal and amplify the stokes wave ν=ν in optical fiber 0-Δ ν increases in fiber medium fast; The power of most of pump light can convert stokes light to, and Raman amplification is arranged, and gain can suppress the loss of optical fiber; Improve the operating distance of fully distributed fiber strain, temperature sensor; This stimulated Raman scattering phenomenon is used for increasing the operating distance of fully distributed fiber sensor, and the gain of fiber Raman amplifier can reach 25dB usually, is equivalent to increase the nearly 60km of operating distance of sensor.
The principle of distributed fiber Rayleigh scattered photon sensor measurement deformation:
Fiber pulse laser sends laser pulse and injects sensor fibre through the integrated-type optical fibre wavelength division multiplexer; The interaction of laser and optical fiber molecule; Produce Rayleigh scattering light with the incident photon same frequency; Rayleigh scattering light transmits in optical fiber deposits loss, and the exponential decay with fiber lengths holds sharp scattered light intensity to represent with following formula dorsad:
; (4)
In the following formula, For inciding the light intensity at optical fiber place, LBe fiber lengths, IFor Rayleigh scattering light dorsad at fiber lengths LThe light intensity at place, Fiber transmission attenuation for the incident light wave strong point.
Because optical fiber is laid on the scene of detection with sensor fibre; When site environment produces deformation or crackle; Cause the optical fiber at the scene of being laid on to bend; Optical fiber produces local loss; Form the added losses of optical fiber; Total losses then; The light intensity at local place has one to fall; Light intensity is reduced to by , and the added losses that deformation causes are measured through the change of light intensity:
; (5)
The relation of deformation or crackle size and fibre loss adopts realistic model to calculate and carries out the simulation test measurement in the laboratory and obtains.
The principle of distributed fiber Raman scattered photon sensor measurement temperature:
When incident laser and optical fiber molecule generation nonlinear interaction scattering, emit a phonon and be called the Stokes Raman scattering photon, absorb a phonon and be called the anti-Stokes Raman scattering photon, the phonon frequency of optical fiber molecule is 13.2THz.Boltzmann (Boltzmann) law is obeyed in population heat distribution on the optical fiber molecular entergy level, and anti-Stokes Raman scattering light intensity dorsad is in optical fiber:
; (6)
It receives the modulation of fiber optic temperature, the temperature modulation function R a :
; (7)
H is Bo Langke (Planck) constant, and Δ ν is the phonon frequency of an optical fiber molecule, is 13.2THz, and k is a Boltzmann constant, and T is Kai Erwen (Kelvin) absolute temperature.
Adopt the fiber Rayleigh passage to do reference signal in the present invention, come detected temperatures with the ratio of the sharp light intensity of anti-Stokes Raman diffused light and auspicious scattered light:
; (8)
By anti-Stokes Raman diffused light and the auspicious scattered light sharp light strength ratio of fiber Raman optical time domain reflection (OTDR) curve at the optical fiber check point, the influence of deduction strain obtains the temperature information of each section of optical fiber.
Beneficial effect of the present invention is: the fully distributed fiber sensor fusion fiber Raman frequency shifter of fusion fiber Raman frequency shifter of the present invention and raman amplifier; Laser is moved on to the 1660nm wave band and has the wide spectrum of 28nm; Suppressed coherent noise and with the anti-Stokes Raman light that has temperature information in the sensor fibre; Move on to the 1550nm low-loss band of optical fibers, improved the signal to noise ratio (S/N ratio) of sensing system; Merged the C-band fiber Raman amplifier, amplified the anti-Stokes Raman light of 1550nm wave band, the nearly 25dB that gains is equivalent to increase 60km and measures length, on-the-spot deformation, crack and the temperature of energy measurement and not intersecting mutually in the measure field temperature.Be laid on the on-the-spot sensor fibre of taking precautions against natural calamities and insulate, uncharged, anti-electromagnetic interference (EMI); Radiation hardness, corrosion resistant, be essential safe type; Optical fiber be transmission medium be again sensor information; Be the sensor fibre of Intrinsical, and have the long-life more than 50 years that the present invention is applicable to the strain of very-long-range 100km fully distributed fiber, TEMP net.
Description of drawings
Fig. 1 is the synoptic diagram that merges the fully distributed fiber sensor of fiber Raman frequency shifter and raman amplifier;
Among the figure, fiber pulse laser 11, single-mode fiber 12,1660nm laser sheet 13, optical fibre wavelength division multiplexer 14, fiber coupler 15, fibre optic Raman laser 16, sensor fibre 17, optical fiber narrow band reflective filter 18, photoelectricity receiver module 19, digital signal processor 20, industrial computer 21.
Embodiment
Describe the present invention in detail according to accompanying drawing below, it is more obvious that the object of the invention and effect will become.
With reference to Fig. 1, the fully distributed fiber sensor that fiber Raman frequency shifter and raman amplifier are merged in the present invention comprises: fiber pulse laser 11, single-mode fiber 12,1660nm laser sheet 13, optical fibre wavelength division multiplexer 14, fiber coupler 15, fibre optic Raman laser 16, sensor fibre 17, optical fiber narrow band reflective filter 18, photoelectricity receiver module 19, digital signal processor 20 and industrial computer 21.Single-mode fiber 12 is formed the fiber Raman frequency shifter with 1660nm laser sheet 13; Fiber pulse laser 11 sends laser and gets into the fiber Raman frequency shifter; Through frequency displacement 13.2THz to the 1660nm wave band; Get into optical fibre wavelength division multiplexer 14 as broad spectrum light source laser; Optical fibre wavelength division multiplexer 14 has four ports, and its input port links to each other with fiber Raman frequency shifter output port, and the COM output port links to each other with sensor fibre 17 with fiber coupler 15 through optical fiber narrow band reflective filter 18; Fibre optic Raman laser 16, fiber coupler 15 are formed the C-band fiber Raman amplifier with sensor fibre 17; The reverse Rayleigh scattering light of 1660nm wide waveband spectrum that in sensor fibre 17, produces links to each other with an input port of photoelectricity receiver module 19 through an output port of 1450nm optical fiber narrow band reflective filter 18 and optical fibre wavelength division multiplexer 14, a port of supplied with digital signal processor 20 after opto-electronic conversion is amplified; In sensor fibre 17, produce; The reverse anti-Stokes Raman diffused light of 1550nm wide waveband spectrum that amplifies through raman amplifier links to each other with another input port of photoelectricity receiver module 19 through another output port of 1450nm optical fiber narrow band reflective filter 18 and optical fibre wavelength division multiplexer 14; Another port of supplied with digital signal processor 20 after opto-electronic conversion is amplified, digital signal processor 20 links to each other with industrial computer 21.
The centre wavelength of described fiber pulse laser 11 is 1550nm, and spectral width is 0.2nm, and laser pulse width is 10ns, and peak power is that 100W is adjustable, and repetition frequency is that 500Hz-800KHz is adjustable.
Described fiber Raman frequency shifter, it is made up of 1km single-mode fiber 12 and 1660nm laser sheet 13, and optical filter centre wavelength is 1660nm, spectral bandwidth 28nm, transmitance 98% is to the isolation of 1550nm laser>45dB.
Described optical fibre wavelength division multiplexer 14, it has 1660nm laser input port, COM output port, four ports such as 1550nm output port and 1660nm output port.
One end of said fiber coupler 15 links to each other with fibre optic Raman laser 16, and two ends link to each other with optical fiber narrow band reflective filter 18 with sensor fibre 17 respectively in addition.
The centre wavelength of described fibre optic Raman laser 16 is 1450.0nm, spectral bandwidth 0.1nm, and output power 100-1200mW is adjustable, constitutes the C-band fiber Raman amplifier by fiber coupler 15, fibre optic Raman laser 16 and sensor fibre 17.
Described sensor fibre 17 adopts 100km communication with G652 single-mode fiber or LEAF optical fiber, and special occasions adopts carbon to apply single-mode fiber.
The centre wavelength of described optical fiber narrow band reflective filter 18 is 1450.0nm, spectral bandwidth 0.5nm, reflectivity 99%.
Described photoelectricity receiver module 19 adopts InGaAs photoelectricity avalanche diode and low noise broadband prime amplifier integrated chip MAX4107 and three grades of main amplifiers compositions of two-way low noise.
Described digital signal processor 20 adopts 16 two passages of the Alazar Tech. ATS of company 9642 types
High-speed wideband signal acquisition process card.
The course of work of the present invention is following: during work; The light pulse laser instrument sends laser pulse and gets into the fiber Raman frequency shifter; The fiber Raman frequency shifter with the fiber pulse laser frequency displacement 13.2THz of 1550nm wave band to the 1660nm wave band, as the broad spectrum light source of fully distributed fiber sensor.Wide spectrum laser pulse passes through optical fibre wavelength division multiplexer; Optical fiber narrowband reflection filter and fiber coupler get into sensor fibre; The reverse Rayleigh scattering of 1660nm wave band that in sensor fibre, produces is through wavelength division multiplexer; The photoelectricity receiver module converts light signal to analog electrical signal and amplification, is obtained the information of strain by the strength ratio of Rayleigh scattering light; By fibre optic Raman laser; Fiber coupler and sensor fibre constitute the C-band fiber Raman amplifier; The 1550nm wave band anti-Stokes Raman scattering that produces in the sensor fibre is amplified through fiber Raman amplifier, and through wavelength division multiplexer, the anti-Stokes Raman diffused light that is exaggerated that has temperature information is through the photoelectricity receiver module; Strength ratio by anti-Stokes Raman diffused light and Rayleigh scattering light; The influence of deduction strain obtains the temperature information of each section of optical fiber, and there is not cross effect in the detection of strain and temperature, utilizes optical time domain reflection to the location of the check point on the sensor fibre (optical fibre radar location).Survey through digital signal processor and strain, the demodulation of temperature demodulation software and to strain and temperature and to calibrate; In 60 seconds, obtain each point strain and temperature variation on the 100km sensor fibre; Temperature measurement accuracy ± 2oC; Carry out telecommunication network transmission by computing machine communication interface, communications protocol, when check point on the sensor fibre reaches strain or the temperature alarming setting value of setting, send alerting signal to alarm controller.

Claims (8)

1. fully distributed fiber sensor that merges fiber Raman frequency shifter and raman amplifier; It is characterized in that it comprises: fiber pulse laser (11),, single-mode fiber (12), 1660nm laser sheet (13), optical fibre wavelength division multiplexer (14), fiber coupler (15), fibre optic Raman laser (16), sensor fibre (17), optical fiber narrow band reflective filter (18), photoelectricity receiver module (19), digital signal processor (20) and industrial computer (21) etc.; Wherein, single-mode fiber (12) and 1660nm laser sheet (13) are formed the fiber Raman frequency shifter, and fibre optic Raman laser (16), fiber coupler (15) are formed the C-band fiber Raman amplifier with sensor fibre (17); Fiber pulse laser (11) sends laser and gets into the fiber Raman frequency shifter; Through frequency displacement 13.2THz to the 1660nm wave band; Get into optical fibre wavelength division multiplexer (14) as broad spectrum light source laser; Optical fibre wavelength division multiplexer (14) has four ports, and its 1660nm laser input port links to each other with fiber Raman frequency shifter output port, and the COM output port links to each other with sensor fibre (17) with fiber coupler (15) through optical fiber narrow band reflective filter (18); The reverse Rayleigh scattering light of 1660nm wide waveband spectrum that in sensor fibre (17), produces links to each other with an input port of photoelectricity receiver module (19) through the 1660nm output port of optical fiber narrow band reflective filter (18) and optical fibre wavelength division multiplexer (14), a port of supplied with digital signal processor (20) after opto-electronic conversion is amplified; The reverse anti-Stokes Raman diffused light of 1550nm wide waveband spectrum that amplifies through raman amplifier that in sensor fibre (17), produces links to each other with another input port of photoelectricity receiver module (19) through the 1550nm output port of optical fiber narrow band reflective filter (18) and optical fibre wavelength division multiplexer (14); Another port of supplied with digital signal processor (20) after opto-electronic conversion is amplified, digital signal processor (20) links to each other with industrial computer (21).
2. the fully distributed fiber sensor of fusion fiber Raman frequency shifter according to claim 1 and raman amplifier; It is characterized in that; The centre wavelength of said fiber pulse laser (11) is 1550nm, and spectral width is 0.2nm, and laser pulse width is that 10-30ns is adjustable; Peak power is that 100W is adjustable, and repetition frequency is that 500Hz-800KHz is adjustable.
3. the fully distributed fiber sensor of fusion fiber Raman frequency shifter according to claim 1 and raman amplifier; It is characterized in that; Said fiber Raman frequency shifter is made up of 1km single-mode fiber (12) and 1660nm laser sheet (13), and optical filter centre wavelength is 1660nm, spectral bandwidth 28nm; Transmitance 98% is to the isolation of 1550nm laser>45dB.
4. the fully distributed fiber sensor of fusion fiber Raman frequency shifter according to claim 1 and raman amplifier; It is characterized in that; Said optical fibre wavelength division multiplexer (14); It has 1660nm laser input port, COM output port, four ports such as 1550nm output port and 1660nm output port.
5. the fully distributed fiber sensor of fusion fiber Raman frequency shifter according to claim 1 and raman amplifier; It is characterized in that; The centre wavelength of said fibre optic Raman laser (16) is 1450.0nm, spectral bandwidth 0.1nm, and output power 100-1200mW is adjustable.
6. the fully distributed fiber sensor of fusion fiber Raman frequency shifter according to claim 1 and raman amplifier is characterized in that, said sensor fibre (17) adopts 100km communication to apply single-mode fiber with G652 single-mode fiber, LEAF optical fiber or carbon.
7. the fully distributed fiber sensor of fusion fiber Raman frequency shifter according to claim 1 and raman amplifier is characterized in that, the centre wavelength of said optical fiber narrow band reflective filter (18) is 1450.0nm, spectral bandwidth 0.5nm, reflectivity 99%.
8. fusion fiber Raman frequency shifter according to claim 1; The fully distributed fiber sensor of raman amplifier; It is characterized in that said photoelectricity receiver module (19) adopts InGaAs photoelectricity avalanche diode and low noise broadband prime amplifier integrated chip MAX4107 and three grades of main amplifiers compositions of two-way low noise.
CN2012100388287A 2012-02-21 2012-02-21 Fully-distributed optical fiber sensor in combination of optical fiber Raman frequency shifter and Raman amplifier Pending CN102589459A (en)

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PCT/CN2012/071483 WO2013123655A1 (en) 2012-02-21 2012-02-23 Fused optical fiber raman frequency shifter and fully distributed optical fiber sensor for raman amplifier

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