CN110220540A - A kind of detection light generation system applied to distributive fiber optic strain demodulation - Google Patents
A kind of detection light generation system applied to distributive fiber optic strain demodulation Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/18—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge using photoelastic elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical 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
- G01D5/26—Mechanical 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 infrared, visible, or ultraviolet light
- G01D5/32—Mechanical 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 infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical 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 infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical 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 infrared, visible, or ultraviolet 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
- G01D5/35338—Mechanical 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 infrared, visible, or ultraviolet 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
- G01D5/35354—Sensor working in reflection
- G01D5/35358—Sensor working in reflection using backscattering to detect the measured quantity
- G01D5/35364—Sensor 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
- G01K11/322—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres using Brillouin scattering
Abstract
The invention discloses a kind of detection light generation systems applied to distributive fiber optic strain demodulation, mainly include light source input, double MZ electrooptic modulators, 90 degree of electric bridges, swept signal source, substrate bias controller, coupler, detection light output.The present invention uses the method for Single Side Band Module inhibited based on carrier wave to realize the generation for being applied to distributive fiber optic strain detection light, is conducive to the system stability for improving single light source demodulation scheme, promotes the signal-to-noise ratio of detection light, reduces hardware cost；Compared to the detection light production method based on modulation filtering, detection optical signal to noise ratio both can be improved, the power for detecting light can also be made to be maintained at higher level, reduced the influence that optical frequency is drifted about to demodulation；Bias voltage control is used to modulator, is conducive to the environment resistant interference performance of enhanced modulation device, reduces unstability caused by the environmental factors such as temperature drift, keeps (FBG) demodulator work relatively reliable；Scenario-frame is simple, novel in design.
Description
Technical field
The present invention relates to Distributed Optical Fiber Sensing Techniques, distribution type fiber-optic Brillouin strain and temperature sensor field,
More particularly to a kind of detection light generation system applied to distributive fiber optic strain demodulation.
Background technique
Distributing optical fiber sensing is a kind of novel method for sensing, and wherein optical fiber is laid in object as sensor information
Surface or inside can measure strain and the profiling temperatures of body surface or inside.It is distributed compared with traditional monitoring means
Optical fiber sensing technology has the following characteristics that the strained situation that can accurately provide at any location point of each sensing optic cable in one's power,
Avoid error caused by calculating because of theoretical modeling；The strained situation of structural body can be accurately positioned, facilitate investigation is abnormal to answer
Stress condition at change checks failure；Using communication cable, the cost of sensor is made to decline to a great extent；Once optical cable is destroyed,
Facilitate and optical cable damaged location is positioned and repaired with technologies such as OTDR；With the non-fiber-optic monitoring scheme such as resistance-type, type vibration wire
Than distributive fiber optic strain monitors system, realizes photodetachment, sensor ends are without electricity, therefore anti-electromagnetic interference capability is strong, are suitable for
Coal mine, oil field, power plant, oil plant, converter etc. be explosion-proof, radiation, high temperature, hazardous area.
The core component of Distributed Optical Fiber Sensing Techniques is (FBG) demodulator, effect be to optical fiber both ends input two-beam, and
The scattered signal solution returned in optical fiber is counted as strain and temperature change.When pump light and detect light two-beam phase in a fiber
It meets, when difference on the frequency is in Brillouin's frequency spectrum, Brillouin scattering effect can be generated, detection light intensity is changed by pump light.If to spy
It surveys light and carries out frequency sweep, then can measure the brillouin frequency spectral property of each location point in optical fiber.Due to Brillouin's frequency spectrum and optical fiber
Suffered stress, temperature are in a linear relationship in a certain range, thus by measurement Brillouin's frequency spectrum, can extrapolate optical fiber each
Strain, Temperature Distribution at location point.
Generation for detection light has and realizes pump light and detection light respectively using two arbitrary sources, but due to needing
Difference on the frequency locking is carried out to pump light source and control light source, drift about once difference on the frequency is affected by environment, then need to pass through
Negative-feedback circuit carries out relocking, this introduces environment unstability to system, this proposes very high request for circuit, introduces to system
Fringe cost, for each light source require carry out path length control, increase system complexity, as patent CN200980147933,
CN201210194790.And patent CN201310611957 realizes the generation of detection light using the method for modulation filtering, that is, uses
Modulator generates a series of sidebands, then filters out required sideband (such as stokes light) with narrow band filters such as fiber gratings, still
This requires the line width of filter extremely narrow (10GHz), and needs to be aligned with optical frequency, once environmental perturbation causes optical frequency to be shaken, then can
Reduce detection of optical power, introduces error to demodulation, the environmental drift of this external modulator also will affect the power swing of detection light.
Summary of the invention
It is an object of the invention to overcome the shortcomings of the prior art, and provide a kind of applied to distributive fiber optic strain
The detection light generation system of demodulation.
The object of the present invention is achieved by the following technical solutions: mainly including light source input, double MZ Electro-optical Modulations
Device, 90 degree of electric bridges, swept signal source, substrate bias controller, coupler, detection light output, light source are input to double MZ electric light tune
One light input of device processed, swept signal source have an electricity output to be connected to 90 degree of electric bridges, one electricity input, and there are two 90 degree of electric bridges
Electricity output is signally attached to two electricity inputs of double MZ electrooptic modulators as RF, and substrate bias controller is connected to there are four electricity output
The other four electricity of double MZ electrooptic modulators inputs, and the light that double MZ electrooptic modulators have a light output to be connected to coupler is defeated
Enter, for coupler there are two the input of a light and detection light output that light output is connected respectively to substrate bias controller, coupler will be double
The optical signal of MZ electrooptic modulator output is divided into two-way, is injected into tested optical fiber one end as detection light all the way, is used as light all the way
Signal is fed back, and swept signal source modulation exports sine wave signal and frequency signal is continuously adjustable, and 90 degree of electric bridges believe frequency sweep
The sine sweep signal output of number source output is the frequency sweep electric signal that two-way differs 90 degree.
The light source input is continuous narrow linewidth light source.
Double MZ electrooptic modulators use double parallel I/Q modulator, are made of three MZ modulators, including two sub- MZ,
Referred to as I arm and Q arm and a main MZ, referred to as P arm.
The substrate bias controller is by coupler light signal fed back, at three MZ modulators for adjusting double MZ electrooptic modulators
In respective the operation is stable point.
The sine wave signal characteristic of the swept signal source output are as follows:
A (t)=sin (2 π ft), enables φ=ω t=2 π ft,
Wherein f is modulating frequency, and for modulating frequency near 10GHz, t is the time, after 90 degree of electric bridges, the modulation of output
Signal is respectively as follows: A1 (t)=sin (φ), A2 (t)=cos (φ).
The substrate bias controller controls the I arm of double MZ electrooptic modulators respectively and Q arm is locked in NULL, P arm lock Q+/
Q-, the light intensity of input modulator are E0, then:
The upper arm optical signal of I arm is E0esin(φ), and lower arm optical signal is E0esin(φ+π)；
The upper arm optical signal of P arm is E0ecos(φ), and lower arm optical signal is E0ecos(φ+π)；
There is the optical signal of output according to Bezier expansion formula and Bessel function property are as follows:
It is applied to divide the invention has the benefit that the present invention uses the method for Single Side Band Module inhibited based on carrier wave to realize
Cloth fibre strain detects the generation of light, is conducive to the system stability for improving single light source demodulation scheme, promotes the letter of detection light
It makes an uproar and compares, reduce hardware cost；Compared to the detection light production method based on modulation filtering, detection optical signal to noise ratio both can be improved
(40dB) can also make the power for detecting light be maintained at higher level, reduce the influence that optical frequency is drifted about to demodulation；Modulator is used
Bias voltage control is conducive to the environment resistant interference performance of enhanced modulation device, reduces unstability caused by the environmental factors such as temperature drift, makes
(FBG) demodulator work is relatively reliable；Scenario-frame is simple, novel in design, is grinding practical application in (FBG) demodulator certainly, and at present
Have no that domestic other unit carries out the relevant report for having the technical research of similar sensor and carrying out patent application.
Detailed description of the invention
Fig. 1 is system structure diagram of the invention.
Fig. 2 is system principle schematic diagram of the invention.
Fig. 3 is image flow chart of the invention.
Description of symbols: light source inputs 1, double MZ electrooptic modulators 2,90 degree of electric bridges 3, swept signal sources 4, bias voltage control
Device 5, coupler 6, detection light output 7.
Specific embodiment
Below in conjunction with attached drawing, the present invention will be described in detail:
Embodiment 1: as shown in the picture, this detection light generation system applied to distributive fiber optic strain demodulation, mainly
Including light source input 1,2,90 degree of electric bridges 3 of double MZ electrooptic modulators, swept signal source 4, substrate bias controller 5, coupler 6, detection
Light output 7, light source input 1 are continuous narrow linewidth light source.Light source input 1 is input to the 2 one light inputs of double MZ electrooptic modulators, sweeps
Frequency source signal 4 has an electricity output to be connected to 90 degree of electric bridges, 3 one electricity inputs, and there are two electricity outputs as RF letter for 90 degree of electric bridges 3
Two electricity inputs of double MZ electrooptic modulators 2 number are connected to, there are four electricity outputs to be connected to double MZ Electro-optical Modulations for substrate bias controller 5
The other four electricity of device 2 inputs, the light input that double MZ electrooptic modulators 2 have a light output to be connected to coupler 6, coupler
6 there are two the input of a light and detection light output 7 that light output is connected respectively to substrate bias controller 5, and coupler 6 is by double MZ electric light
Modulator 2 export optical signal be divided into two-way, all the way as detection light be injected into tested optical fiber one end, all the way as optical signal into
Row feedback, the modulation of swept signal source 4 output sine wave signal and frequency signal is continuously adjustable, 90 degree of electric bridges 3 are by swept signal source 4
The sine sweep signal output of output is the frequency sweep electric signal that two-way differs 90 degree.
Double MZ electrooptic modulators 2 use double parallel I/Q modulators, are made of three MZ modulators, including two sub- MZ (on
MZ and lower MZ, or be 1st/2nd MZ, or be I arm and Q arm) and a main MZ (3rd MZ, or be P arm).Bias control
For device 5 processed by 6 light signal fed back of coupler, it is steady that three MZ modulators of the double MZ electrooptic modulators 2 of adjusting are in respective work
Fixed point.Substrate bias controller 5 controls the I arm of double MZ electrooptic modulators 2 respectively and Q arm is locked in NULL, and P arm is generally locked in Q+/Q-,
If the light intensity of input modulator is E0, then:
The upper arm optical signal of I arm is E0esin(φ), and lower arm optical signal is E0esin(φ+π)；
The upper arm optical signal of P arm is E0ecos(φ), and lower arm optical signal is E0ecos(φ+π)；
There is the optical signal of output according to Bezier expansion formula and Bessel function property are as follows:
The sine wave signal characteristic that swept signal source 4 exports are as follows:
A (t)=sin (2 π ft), enables φ=ω t=2 π ft,
Wherein f is modulating frequency, and for modulating frequency near 10GHz, t is the time, after 90 degree of electric bridges 3, the tune of output
Signal processed is respectively as follows: A1 (t)=sin (φ), A2 (t)=cos (φ).
Embodiment 2: light source input 1 is wavelength 1550.12nm, line width is less than 1kHz, the continuous light of narrow linewidth of output 7dBm.
Double MZ electrooptic modulators 2 are using bandwidth 10GHz, the double MZ modulators of extinction ratio driving mono- greater than the DQPSK of 20dB.Swept signal source
4 be input to 90 degree of electric bridges 3 signal be power 28dBm, the period from 9GHz~13GHz with the sinusoidal signal of step-length 5MHz frequency sweep.
Signal is divided into the two-way RF signal of 90 degree of difference by 90 degree of electric bridges 3, into two sub- MZ modulation inside double MZ electrooptic modulators 2
In device.The coupling ratio of coupler 6 is 99:1, and the light output of double MZ electrooptic modulators 2 enters in coupler 6.The 99% of coupler 6
As detection light output 7,1% end enters as reference light carries out bias voltage correction and stabilization in substrate bias controller 5 at end.Bias voltage control
Device 5 four tunnels output respectively between two sub- MZ modulator biass, parts of double MZ electrooptic modulators 2 bias, (GND) be connected.
Double MZ electrooptic modulators 2 use double parallel I/Q modulators, are made of three MZ modulators, including two sub- MZ (on
MZ and lower MZ, or be 1st/2nd MZ, or be I arm and Q arm) and a main MZ (3rd MZ, or be P arm).Bias control
For device 5 processed by 6 light signal fed back of coupler, it is steady that three MZ modulators of the double MZ electrooptic modulators 2 of adjusting are in respective work
Fixed point.Substrate bias controller 5 controls the I arm of double MZ electrooptic modulators 2 respectively and Q arm is locked in NULL, and P arm is generally locked in Q+/Q-,
If the light intensity of input modulator is E0, then:
The upper arm optical signal of I arm is E0esin(φ), and lower arm optical signal is E0esin(φ+π)；
The upper arm optical signal of P arm is E0ecos(φ), and lower arm optical signal is E0ecos(φ+π)；
The complex amplitude of the single armed of a upper MZ changes are as follows:
E (t)=E0eixsin(φ)
Had according to Bezier expansion formula and Bessel function property:
J-m(x)=(- 1)mJm(x)
Therefore the upper arm amplitude of upper MZ is unfolded are as follows:
Similarly, the lower arm amplitude expansion of upper MZ are as follows:
After the two closes beam, because 6 beam splitting of coupler has the phase shift of pi/2, equally there is the phase of pi/2 after second coupler closes beam
It moves, such lower arm introduces the phase shift of π altogether, practical to subtract each other for two-arm, amplitude are as follows:
Similarly, the upper arm amplitude expansion of lower MZ are as follows:
The lower arm amplitude of lower MZ is unfolded are as follows:
The two (is subtracted each other) after closing beam, amplitude are as follows:
After double MZ close beam, since P arm is locked in Q point, so being introduced when Ying He beam in MZ2Phase, then exporting
Optical signal are as follows:
Due to J3(x) it is that high-order is a small amount of, can ignores, only retain J1(x) component, so being adjusted by double MZ electrooptic modulators 2
After system output, single-side belt filtering modulation can be played the role of to input optical signal.
It is understood that it will be understood by those skilled in the art that being subject to technical solution of the present invention and inventive concept
It all should fall within the scope of protection of the appended claims of the present invention with replacement or change.
Claims (6)
1. a kind of detection light generation system applied to distributive fiber optic strain demodulation, it is characterised in that: mainly include that light source is defeated
Enter (1), double MZ electrooptic modulators (2), 90 degree of electric bridges (3), swept signal source (4), substrate bias controller (5), coupler (6), visit
It surveys light output (7), light source input (1) is input to (2) the light inputs of double MZ electrooptic modulators, and swept signal source (4) has one
Electricity output is connected to (3) the electricity inputs of 90 degree of electric bridges, and electricity output that there are two 90 degree of electric bridges (3) is signally attached to double MZ as RF
Two electricity inputs of electrooptic modulator (2), there are four electricity outputs to be connected to double MZ electrooptic modulators (2) for substrate bias controller (5)
The input of other four electricity, the light input that double MZ electrooptic modulators (2) have a light output to be connected to coupler (6), coupler
(6) there are two the input of a light and detection light output (7) that light output is connected respectively to substrate bias controller (5), coupler (6) will
The optical signal of double MZ electrooptic modulator (2) outputs is divided into two-way, is injected into tested optical fiber one end as detection light all the way, makees all the way
It is fed back for optical signal, swept signal source (4) modulation exports sine wave signal and frequency signal is continuously adjustable, 90 degree of electric bridges
(3) the sine sweep signal that swept signal source (4) export is exported into the frequency sweep electric signal for 90 degree of two-way difference.
2. the detection light generation system according to claim 1 applied to distributive fiber optic strain demodulation, it is characterised in that:
The light source input (1) is continuous narrow linewidth light source.
3. the detection light generation system according to claim 1 applied to distributive fiber optic strain demodulation, it is characterised in that:
Double MZ electrooptic modulators (2) use double parallel I/Q modulator, are made of three MZ modulators, including two sub- MZ, referred to as I
Arm and Q arm and a main MZ, referred to as P arm.
4. feature exists according to claim 1 with the detection light generation system that is applied to distributive fiber optic strain demodulation described in 3
In: the substrate bias controller (5) adjusts three MZ modulation of double MZ electrooptic modulators (2) by coupler (6) light signal fed back
Device is in respective the operation is stable point.
5. the detection light generation system according to claim 1 applied to distributive fiber optic strain demodulation, it is characterised in that:
The sine wave signal characteristic of swept signal source (4) output are as follows:
A (t)=sin (2 π ft), enables φ=ω t=2 π ft,
Wherein f is modulating frequency, and for modulating frequency near 10GHz, t is the time, after 90 degree of electric bridges (3), the modulation of output
Signal is respectively as follows: A1 (t)=sin (φ), A2 (t)=cos (φ).
6. the detection light generation system according to claim 1 or 4 applied to distributive fiber optic strain demodulation, feature exist
Control the I arm of double MZ electrooptic modulators (2) respectively in: the substrate bias controller (5) and Q arm be locked in NULL, P arm lock Q+/
Q-, the light intensity of input modulator are E(0), then:
The upper arm optical signal of I arm is E0esin(φ), and lower arm optical signal is E0esin(φ+π)；
The upper arm optical signal of P arm is E0ecos(φ), and lower arm optical signal is E0ecos(φ+π)；
There is the optical signal of output according to Bezier expansion formula and Bessel function property are as follows:
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| CN112033301A (en) * | 2020-08-07 | 2020-12-04 | 太原理工大学 | Scrape trigger crookedness optical fiber measurement system |
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