CN105865500B - A kind of PSK demodulation method of optical-fiber laser interferometric sensor - Google Patents
A kind of PSK demodulation method of optical-fiber laser interferometric sensor Download PDFInfo
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- 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
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Abstract
The present invention relates to a kind of PSK demodulation method of optical-fiber laser interferometric sensor, belong to technical field of optical fiber sensing.This method is not required specifically the phase difference between interference signal, after (FBG) demodulator completes, interferometer available for different optical path differences, and remove the influence of DC quantity by the mutual computing between primary signal, thoroughly solve two problems that optical-fiber laser interferometric sensor measurement Dynamic Signal is run into.That is, the light of three beams different wave length is incided into fiber optic interferometric sensor, obtains the three dephased signals of road band, reach the purpose of phase shift；The road signals of Zai Dui tri- are handled, and are eliminated the influence of DC component a in signal, and the tangent value of signal required by acquisition, hereafter, through arctangent cp cp operation and Phase- un- wrapping, are finally obtained measured signal.The present invention can be demodulated to the interferometric optical fiber sensor of any optical path difference, and belong to passive demodulation method, and its frequency, demodulation frequency is high, is only limited by Electric signal processing speed.
Description
Technical field
The present invention relates to a kind of PSK demodulation method of optical-fiber laser interferometric sensor, belong to technical field of optical fiber sensing.
Background technology
Laser interference demodulation techniques can be to Michelson, Mach-Zehnder, Fabry-Perot and external cavity type Fabry-
The interferometers such as Perot (EFPI) are demodulated.There is phase load for demodulating the conventional demodulation scheme of these interferometer Dynamic Signals
Ripple (PGC) method, the homodyne demodulation method based on 3 × 3 fiber couplers, the orthogonal operating point direct method of measurement, the orthogonal solution of passive homodyne
Tune method etc..
It is current known to optical-fiber laser interferometric sensor measure Dynamic Signal (vibration, sound etc.) be demodulated it is relatively good
Scheme be passive homodyne quadrature demodulation scheme, it is not limited by linearly interval scope, not comprising active device, measurement frequency
Height, applied widely, versatility is good, high sensitivity.By taking EFPI sensors as an example, this method includes double F-P chambers orthogonal measuring
Method [K.A.Murphy et al, Quadrature phase-shifted, extrinsic Fabry-Perotoptical
Fiber sensors, Optics Letters, 1991,16 (4):273-275] and dual wavelength orthogonal measuring method
[O.B.Wright,Stabilized dual-wavelength fiber-optic interferometer for
Vibration measurement, Optics Letter, 1991,16 (1):56-58], after two orthogonal signals are obtained,
Measured signal is finally obtained using DCM (differential cross multipler) algorithms or arc tangent algorithm.But, it is sharp
There is larger difficulty on sensor with double F-P chambers to obtain the method for two-way orthogonal signalling and make in practice, and dual wavelength is orthogonal
Rule is measured to be easier to realize, thus dual wavelength orthogonal measuring is widely used.
By development for many years, passive homodyne quadrature demodulation method is ripe day by day, but because it is to the orthogonal of two signals
Rely on, its use is constantly subjected to both sides and limited：
(1) for EFPI sensors, in order to obtain two-way orthogonal signalling, either obtained with double F-P chambers orthogonal
Signal, or dual wavelength list F-P cavity obtain orthogonal signalling, require that chamber length and the wavelength of input laser strictly match, with guarantor
It is orthogonal to demonstrate,prove two-way interference signal.Therefore, once (FBG) demodulator manufactures completion, the versatility of EFPI sensors and making have larger
It is difficult.For other kinds of optical-fiber laser interferometric sensor, it is also difficult strictly to control its optical path difference (OPD).
(2) either DCM algorithms or arc tangent algorithm, be required for demodulating process try at the very start remove original letter
DC quantity in number.Through frequently with method have two kinds, one is exactly to remove DC quantity with high-pass filter
[O.B.Wright,Stabilized dual-wavelength fiber-optic interferometer for
Vibration measurement, Optics Letter, 1991,16 (1), 56-58], but this method only amplitude compared with
Just it is applicable in the case of big, once phase-modulation amplitude is less than 2 π, this method will be unable to correctly demodulate；Another method is exactly
DC quantity is measured before using (FBG) demodulator, is then input to as preset parameter in demodulation process, this method is obviously in reality
There is inconvenience on border in, often changes primary transducer and is required for recalibrating, and can not obtain in some cases accurately straight
Flow.
In 2010, we have proposed a kind of phase compensating method of passive homodyne quadrature demodulation [Jiang Yi, Guo Gui honor mono-
The phase compensating method of kind passive homodyne quadrature demodulation technology:Chinese patent, CN101713685A.2010-05-26], to original
Two-way interference signal handled and calculated, the phase difference that two-way interference signal deviates 90 ° is then compensated, although part overcomes
The problem of making of above-mentioned first sensor and limited versatility, but it fails when phase-modulation amplitude is less than 2 π, still
So do not solve above-mentioned two problems thoroughly.
The content of the invention
The invention aims to solve the defects of existing quadrature demodulation method, there is provided a kind of optical-fiber laser interference-type sensing
The PSK demodulation method of device.This method do not required specifically the phase difference between interference signal, can after (FBG) demodulator completes
For the interferometer of different optical path differences, and remove by the mutual computing between primary signal the influence of DC quantity, thoroughly solve
The above-mentioned two problems that optical-fiber laser interferometric sensor measurement Dynamic Signal is run into.
To reach above-mentioned target, specific implementation of the invention is as follows.
A kind of PSK demodulation method of optical-fiber laser interferometric sensor, is comprised the following steps that：
Step 1: when being measured using fiber optic interferometric sensor to Dynamic Signal, by swashing for three beams different wave length
Light is incided in fiber optic interferometric sensor after closing beam by wavelength division multiplexer (WDM) or 3 × 3 couplers, interferometric sensor
Reflected light is returned by 2 × 2 couplers, then is decomposed into the three dephased signals of road band by WDM.Three tunnels carry phase
The signal of difference turns into three road electric signals by opto-electronic conversion, and three road electric signals are expressed as： Wherein a is DC component, and b is the contrast of interference fringe,To be surveyed Dynamic Signal, δ1、δ2、δ3Respectively signal f1、f2、f3With signal f1Between phase difference, its size and laser
Wavelength X1、λ2、λ3And the optical path difference OPD of interferometric sensor is relevant, is expressed as： Thus, the purpose of phase shift has been reached.
Step 2: handling the road signals of step 1 Zhong tri-, the influence of DC component a in signal is eliminated, and is obtained
The tangent value of required signal：
Have through identical transformation,It can thus be concluded thatIn formula, B=cos δ1-cosδ3、
C=sin δ1-sinδ3, D=2cos δ2-cosδ1-cosδ3, E=2sin δ2-sinδ1-sinδ3, in phase difference δ1、δ2And δ3Necessarily
When, B, C, D, E are known constant.It is rightArctangent cp cp operation is carried out, the value that arctangent cp cp operation obtains is in (- pi/2, pi/2) model
In enclosing, therefore Phase- un- wrapping need to be carried out to the result after arc tangent, can just obtain complete signal
Signal is obtained described in step 2Method be：It is rightMolecule (B-AD) and denominator (C-AE) carry out DCM demodulation
Also it can obtain correct signal
Beneficial effect
A kind of PSK demodulation method of optical-fiber laser interferometric sensor of the present invention, successfully avoid straight in primary signal
The flow component demodulating error brought non-orthogonal to the interference of measurement and primary signal.It the experiment proved that, measurement accuracy of the present invention
It is high, method is succinct, applied widely, to the optical path difference OPD of interferometer without specific requirement, and no matter the phase-modulation amplitude of signal
Size, can correct demodulated signal, it is practical.
Brief description of the drawings
Fig. 1 is measuring system structured flowchart
Fig. 2 is situation (the sampling frequency for the EFPI sensors loading 10Hz sine waves that a length of 622 μm of chamber is demodulated using this method
Rate is 100KHz)：The tunnel primary signals of a Tu Wei tri-, solid line, thick dashed line, fine dotted line are respectively signal f1、f2、f3, abscissa is to adopt
Number of samples, ordinate unit are volt；B figures, c figures and d figures are respectively signal f1And f2, signal f2And f3And signal f1And f3Between
Li Sarutu；E figures are the signal (peak-to-peak value 1005.3nm) after demodulation, and abscissa is sampling number, and ordinate unit is to receive
Rice；F figures be demodulation after signal spectrogram, peak value 10Hz.
Fig. 3 is the situation (sampling for the EFPI sensors loading 1000Hz sine waves that a length of 350 μm of chamber is demodulated using this method
Frequency is 100KHz), the now π of phase-modulation underswing 2 of signal：The tunnel primary signals of a Tu Wei tri-, solid line, thick dashed line, thin void
Line is respectively signal f1、f2、f3, abscissa is sampling number, and ordinate unit is volt；B figures, c figures and d figures are respectively signal f1
And f2, signal f2And f3And signal f1And f3Between Li Sarutu；E figures are the signal (peak-to-peak value 115.6nm) after demodulation, horizontal
Coordinate is sampling number, and ordinate unit is nanometer；F figures be demodulation after signal spectrogram, peak value 1000Hz.
Embodiment
With reference to Figure of description and embodiment, the present invention is described further.
Embodiment 1
10Hz sine wave is downloaded on a length of 622um of chamber EFPI sensors, reuses the present invention to demodulate EFPI
The Dynamic Signal of sensor.
Step 1: the laser of three road different wave lengths is incided in sensor by WDM, the light of return is passed through WDM points
The dephased signals of road band of Xie Wei tri-, the three dephased signals of road band turn into three road electric signals, three tunnels by opto-electronic conversion
Electric signal is expressed as：
Wherein a is DC component, and b is the contrast of interference fringe,To be surveyed Dynamic Signal, δ1、δ2、δ3Respectively signal f1、f2、f3
With signal f1Between phase difference, the wavelength X of its size and laser1、λ2、λ3And the optical path difference OPD of interferometric sensor has
Close, for EFPI sensors, OPD=2d (d is that the chamber of EFPI chambers is grown), then have：δ1=0,
The tunnel primary signal collections of Jiang Zhe tri-, which enter in (FBG) demodulator, is handled (sample frequency is 100KHz in this example), such as
Shown in Fig. 2 (a).Fig. 2 (b), (c), (d) are respectively signal f1、f2, f2、f3And f1、f3Between Li Sarutu, it can be seen that letter
Phase difference is not 90 degree between number, and phase relation changes with the change that EFPI chambers are grown.
Step 2: handling the road signals of step 1 Zhong tri-, the influence of DC component a in signal is eliminated, and is obtained
The tangent value of required signal：
Because δ1、δ2、δ3It has been tried to achieve that, then there are B=cos δ1-cosδ3, C=sin δ1-sinδ3, D=2cos δ2-cosδ1-cos
δ3, E=2sin δ2-sinδ1-sinδ3.B, C, D, E are known constant.And then understand：Carry out identical change
After changing, have：
It is rightArctangent cp cp operation is carried out, the value that arctangent cp cp operation obtains, therefore need to be to anti-in the range of (- pi/2, pi/2)
Result after tangent carries out Phase- un- wrapping, has finally demodulated measured signalAnd Fourier transformation is carried out to it and obtains its frequency
Spectrogram, the peak-to-peak value for demodulating signal are 1005.3nm, and frequency 10Hz, Fig. 2 (e), (f) are the signal and its frequency after demodulating
Spectrogram.
Embodiment 2
1000Hz sine wave is downloaded on a length of 350um of chamber EFPI sensors, with same solution in embodiment 1
Instrument is adjusted to carry out demodulated signal.
Step 1: the laser of three road different wave lengths is incided in sensor by WDM, the light of return is passed through WDM points
The dephased signals of road band of Xie Wei tri-, the three dephased signals of road band turn into three road electric signals, three tunnels by opto-electronic conversion
Electric signal is expressed as：
Wherein a is DC component, and b is the contrast of interference fringe,To be surveyed Dynamic Signal, δ1、δ2、δ3Respectively signal f1、f2、f3
With signal f1Between phase difference, the wavelength X of its size and laser1、λ2、λ3And the optical path difference OPD of interferometric sensor has
Close, for EFPI sensors, OPD=2d (d is that the chamber of EFPI chambers is grown), then have：δ1=0,
The tunnel primary signal collections of Jiang Zhe tri-, which enter in (FBG) demodulator, is handled (sample frequency is 100KHz in this example), such as
Shown in Fig. 3 (a).Fig. 3 (b), (c), (d) are respectively signal f1、f2, f2、f3And f1、f3Between Li Sarutu, can be apparent
Find out, now the amplitude of signal is smaller, the π of phase-modulation underswing 2.
Step 2: handling the road signals of step 1 Zhong tri-, the influence of DC component a in signal is eliminated, and is obtained
The tangent value of required signal
Because δ1、δ2、δ3It has been tried to achieve that, then there are B=cos δ1-cosδ3, C=sin δ1-sinδ3, D=2cos δ2-cosδ1-cos
δ3, E=2sin δ2-sinδ1-sinδ3.B, C, D, E are known constant.Then have：Carry out identical transformation
Afterwards, have：
It is rightArctangent cp cp operation is carried out, the value that arctangent cp cp operation obtains, therefore need to be to anti-in the range of (- pi/2, pi/2)
Result after tangent carries out Phase- un- wrapping, has finally demodulated measured signalAnd Fourier transformation is carried out to it and obtains its frequency
Spectrogram, the peak-to-peak value for demodulating signal are 115.6nm, and frequency 1KHz, Fig. 3 (e), (f) are the signal and its frequency after demodulating
Spectrogram.As can be seen that the π of phase-modulation underswing 2 small amplitude signal is remained able to accurately by scheme proposed by the present invention
Demodulate signal.
Demodulation method of the present invention is applicable to the EFPI sensings of any chamber length it can be seen from the two examples
Device, the situation of various amplitude is adapted to, no matter whether phase-modulation amplitude reaches 2 π.For other kinds of optical fiber interference type
Whether sensor, the present invention reach the equal no requirement (NR)s of 2 π to its optical path difference and phase-modulation amplitude, can accurately demodulate and be surveyed
Dynamic Signal.Successfully solve two that the demodulation scheme of existing fiber laser interference type sensor measurement Dynamic Signal is run into
Problem, precision is high, and method is succinct, applied widely, practical.
Claims (2)
- A kind of 1. PSK demodulation method of optical-fiber laser interferometric sensor, it is characterised in that：Comprise the following steps that：Step 1: when being measured using optical-fiber laser interferometric sensor to Dynamic Signal, by swashing for three beams different wave length Light is incided in fiber optic interferometric sensor after closing beam by wavelength division multiplexer (WDM) or 3 × 3 couplers, interferometric sensor Reflected light is returned by 2 × 2 couplers, then is decomposed into the three dephased signals of road band by WDM；Three tunnels carry phase The signal of difference turns into three road electric signals by opto-electronic conversion, and three road electric signals are expressed as：Wherein a is DC component, and b is the contrast of interference fringe,To be surveyed Dynamic Signal, δ1、δ2、δ3Respectively signal f1、 f2、f3With signal f1Between phase difference, the wavelength X of its size and laser1、λ2、λ3And the optical path difference OPD of interferometric sensor It is relevant, it is expressed as：δ1=0,Thus, the purpose of phase shift has been reached；Step 2: handling the road signals of step 1 Zhong tri-, the influence of DC component a in signal is eliminated, and required by acquisition The tangent value of signal：Have through identical transformation,It can thus be concluded thatIn formula, B=cos δ1-cosδ3, C= sinδ1-sinδ3, D=2cos δ2-cosδ1-cosδ3, E=2sin δ2-sinδ1-sinδ3, in phase difference δ1、δ2And δ3One timing, B, C, D, E are known constant；It is rightArctangent cp cp operation is carried out, the value that arctangent cp cp operation obtains is in (- pi/2, pi/2) scope It is interior, therefore Phase- un- wrapping need to be carried out to the result after arc tangent, it can just obtain complete signal
- A kind of 2. PSK demodulation method of optical-fiber laser interferometric sensor as claimed in claim 1, it is characterised in that：Step 2 It is described to obtain complete signalMethod be：It is rightMolecule (B-AD) and denominator (C-AE) carry out DCM demodulation can also obtain To correct signal
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| CN107014412A (en) * | 2017-04-17 | 2017-08-04 | 北京理工大学 | A kind of fiber-sensing measuring method and device of dual interferometer matching demodulation |
| CN107765090B (en) * | 2017-10-16 | 2020-05-19 | 上海传输线研究所（中国电子科技集团公司第二十三研究所） | Phase sequence calibration method for 3x3 coupler |
| CN109084883A (en) * | 2018-08-09 | 2018-12-25 | 合肥工业大学 | Based on phase-BOTDR optical fiber distributed type Brillouin's vibrating sensing measurement method |
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