CN102624456B - Optical fiber interference type sensing signal demodulating system and method - Google Patents
Optical fiber interference type sensing signal demodulating system and method Download PDFInfo
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Abstract
The invention discloses an optical fiber interference type sensing signal demodulating system and a method. The system comprises an analog-to-digital conversion module, a filter module and a signal demodulation computing module, the analog-to-digital conversion module is used for respectively realizing analog-to-digital conversion for an inputted carrier signal and an inputted optical fiber interference signal to generate a first digital sampling result and a second digital sampling result, the filter module is used for realizing frequency mixing processing and low-pass filtering for the first digital sampling result, frequency multiplication of the first digital sampling result and the second digital sampling result which are outputted by the analog-to-digital conversion module, and generating a first filtering result and a second filtering result, and the signal demodulation computing module is used for realizing signal demodulation computation for the first filtering result and the second filtering result which are outputted by the filter module by a differential, squaring and adding algorithm, and generating a signal demodulation computing result. The differential, squaring and adding algorithm, a low-pass filter and a band-pass filter are combined, so that the problem of harmonic distortion caused by change of a demodulation depth value C can be effectively suppressed by the aid of the optical fiber interference type sensing signal demodulating system and the method.
Description
Technical field
The present invention relates to technical field of optical fiber communication, relate in particular to a kind of system and method for optical fiber interference type sensing signal demodulation.
Background technology
That fiber optic interferometric sensor itself has is highly sensitive, fast response time, wide dynamic range, passivity, explosion-proof, anti-electromagnetic interference, superelevation electric insulation, corrosion-resistant, volume is little, lightweight, low cost and other advantages, it can realize demodulation extremely low frequency signal binding signal solution mediation multiplexing technique, simultaneously also there is high accuracy, high stability, high linearity, be easy to that networking is multiplexing, harmonic distortion is low, seismic survey, exploration of ocean resources, geophysical research and under water the aspect such as military confrontation have and apply extremely widely future.
In the multiple demodulation method of fiber optic interferometric sensor, phase generated carrier (Phase Generator Carrier, being called for short PGC) demodulation techniques are a kind of passive demodulation techniques, its have advantages of high-resolution, high linearity, low harmonics distortion, great dynamic range, stability better, do not rely on optical device, performance and comparatively stablize, be easy to multiplexing, be most widely used.
Algorithm based on PGC demodulation techniques mainly contains two kinds at present: differential multiplication cross (DCM) algorithm and arc tangent (Arctan) algorithm.The former changes very responsive to signal light intensity, it has not only increased the noise level of demodulating system, also may introduce pseudo-phase information simultaneously; The latter does not exist light intensity to change the interference problem causing, has higher stability, but it requires modulation depth C value strictly to equal 2.63, otherwise there will be larger harmonic distortion.
Summary of the invention
(1) technical problem that will solve
For solving above-mentioned one or more problems, the invention provides a kind of system and method for optical fiber interference type sensing signal demodulation, to suppress harmonic distortion problems, improve stability.
(2) technical scheme
According to an aspect of the present invention, a kind of system of optical fiber interference type sensing signal demodulation is provided, this system comprises: analog-to-digital conversion module, its input is connected with two inputs of optical fiber interference type transducing signal, for respectively carrier signal and the optical fiber interference signal of input being carried out to analog digital conversion, generate the first digital sample result and the second digital sample result; Filter module, its input is connected with two outputs of analog-to-digital conversion module, carry out Frequency mixing processing and low-pass filtering for the first digital sample result to analog-to-digital conversion module output and frequency multiplication thereof and the second digital sample result, generate the first filtering result and the second filtering result; Signal demodulation computing module, its input is connected with two outputs of filter module, adopt differential involution phase computation system to carry out signal demodulation calculating for the first filtering result to filter module output and the second filtering result, generate signal demodulation result of calculation.
A kind of method of optical fiber interference type sensing signal demodulation is also provided according to another aspect of the present invention.The method comprises: respectively carrier signal and the optical fiber interference signal of input are carried out to analog digital conversion, generate the first digital sample result and the second digital sample result; The first digital sample result and frequency multiplication thereof and the second digital sample result are carried out to Frequency mixing processing and low-pass filtering, generate the first filtering result and the second filtering result; Adopt differential involution phase computation system to carry out signal demodulation calculating to the first filtering result and the second filtering result, generate signal demodulation result of calculation.
(3) beneficial effect
Can find out that from technique scheme the system and method for optical fiber interference type sensing signal demodulation of the present invention has following beneficial effect:
1, harmonic distortion is low: in conjunction with the setting of differential involution phase computation system and low pass filter and band pass filter, can effectively reduce harmonic distortion;
2, stability is high: can remove the impact of light intensity amplitude by modified result, can suppress light intensity and change the interference problem causing, have higher stability;
3, easy to operate: can to realize by total digitalization, be convenient to adjust and application.
Brief description of the drawings
Fig. 1 is the structural representation of embodiment of the present invention optical fiber interference type sensing signal demodulation system;
Fig. 2 is the schematic flow sheet of embodiment of the present invention optical fiber interference type sensing signal demodulation method.
[main element symbol description]
10-analog-to-digital conversion module;
101-first signal conditioning unit; 102-secondary signal conditioning unit;
103-the one AD sampling unit; 104-the 2nd AD sampling unit;
20-filter module;
201-first signal processing unit; 202-secondary signal processing unit;
203-frequency detecting unit; 204-the first low pass filter;
205-the second low pass filter;
30-signal demodulation computing module;
301-the first differentiator; 302-the second differentiator;
303-the first multiplier; 304-the second multiplier;
305-adder; 306-integrator; 307-band pass filter;
The storage of 40-signal detecting result and display module
401-modified result unit; The storage of 402-signal detecting result and display unit.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.Although the demonstration of the parameter that comprises particular value can be provided herein, should be appreciated that, parameter is without definitely equaling corresponding value, but can in acceptable error margin or design constraint, be similar to corresponding value.
The present invention proposes the new method that one is different from two kinds of PGC demodulation method-differential multiplication cross (DCM) algorithms of prior art and arc tangent (Arctan) algorithm, the algorithm that the method adopts differential involution to be added, in conjunction with the setting of low pass filter and band pass filter, and suitable demodulation result is processed and demarcated, thereby demodulation transducing signal accurately.
In one exemplary embodiment of the present invention, a kind of system of optical fiber interference type sensing signal demodulation is proposed.Fig. 1 is the structural representation of embodiment of the present invention optical fiber interference type sensing signal demodulation system.As shown in Figure 1, the present embodiment comprises: analog-to-digital conversion module 10, filter module 20, signal demodulation computing module 30 and signal detecting result storage and display module 40.Below respectively each composition module is elaborated.
First, for ease of explanation, establish without conditioning carrier signal a1 and optical fiber interference signal a2 respectively as shown in the formula shown in (1), (2):
x(t)＝acos(2πft) (1)
Wherein, a, A and B are the amplitude of signal x (t), y (t), and C is modulation depth, and f is frequency modulating signal,
for signal to be demodulated.
Analog-to-digital conversion module 10, its input is connected with two inputs of optical fiber interference type transducing signal, for respectively carrier signal a1 and the optical fiber interference signal a2 of input being carried out to analog digital conversion, generate the first digital sample result b1 and the second digital sample result b2, the first digital sample result b1 and the second digital sample result b2 export to filter module 20.
As shown in Figure 1, analog-to-digital conversion module 10, comprises first signal conditioning unit 101, secondary signal conditioning unit 102, an AD sampling unit 103 and the 2nd AD sampling unit 104.Wherein: first signal conditioning unit 101, be connected with the carrier signal input of optical fiber interference type transducing signal, for the carrier signal a1 of input is carried out to signal condition, make its voltage amplitude in the desired scope of an AD sampling unit 103.Secondary signal conditioning unit 102, is connected with the optical fiber interference signal input of optical fiber interference type transducing signal, for the optical fiber interference signal a2 of input is carried out to signal condition, makes its amplitude in the desired scope of the 2nd AD sampling unit 104.Preferably, an AD sampling unit 103 and the desired voltage amplitude scope of the 2nd AD sampling unit 104 are ± 10V.The one AD sampling unit 103, for the output of first signal conditioning unit 101 is carried out to digital collection, completes analog digital conversion, generates the first digital sample result b1.The 2nd AD sampling unit 104, for the output of first signal conditioning 102 is carried out to digital collection, completes analog digital conversion, generates the second digital sample result b2, and sampling rate keeps synchronizeing with an AD sampling 103.Preferably, the sampling rate of an AD sampling unit 103 and the 2nd AD sampling unit 104 is 10KS/s-200KS/s, and optimum is 2.5KHz.It should be apparent to those skilled in the art that, if can ensure an AD sampling unit of the optical fiber interference type transducing signal of inputting and the scope of the 2nd AD sampling unit, first signal conditioning unit 101 and secondary signal conditioning unit 102 also can omit, and voltage amplitude scope and the sampling rate of an AD sampling unit 103 and the 2nd AD sampling unit 104 also can be adjusted according to actual conditions.
Filter module 20, its input is connected with two outputs of analog-to-digital conversion module 10, carry out Frequency mixing processing and low-pass filtering for the first digital sample result b1 that analog-to-digital conversion module 10 is exported and frequency multiplication thereof and the second digital sample result b2, generate the first filtering result c1 and the second filtering result c2, to suppress humorous wave interference, the first filtering result c1 and the second filtering result c2 export to signal demodulation computing module 30.
As shown in Figure 1, filter module 20 comprises first signal processing unit 201, secondary signal processing unit 202, frequency detecting unit 203, the first low pass filter 204 and the second low pass filter 205.Wherein: first signal processing unit 201, for the first digital sample result b1 and the second digital sample result b2 are carried out to mixing computing, and outputs to the first low pass filter 204 by operation result.Secondary signal processing unit 202, carries out mixing computing for the frequency multiplication to the first digital sample result b1 and the second digital sample result b2, and operation result is outputed to the second low pass filter 205.
Frequency detecting unit 203, be connected with the output of the 2nd AD sampling unit 104, detect its highest frequency for the optical fiber interference signal-the second digital sample result b2 from analog-to-digital conversion, using one times of this frequency to the low-pass cut-off frequencies of twice as the first low pass filter 204 and the second low pass filter 205, this low-pass cut-off frequencies is generally 2KHz～4KHz.
The first low pass filter 204, for first signal processing unit 201 Output rusults are carried out to low-pass filtering, generates the first filtering result c1, and filtering result is as shown in formula (3).The second low pass filter 205, carries out low-pass filtering for secondary signal being processed to 202 Output rusults, generates the second filtering result c2.Filter low pass setting is controlled by frequency detecting unit 203 Output rusults, and the filter setting of the second low pass filter 205 keeps identical with the first low pass filter 204, and filtering result is as shown in formula (4).
Signal demodulation computing module 30, its input is connected with the output of filter module 20, adopt differential involution to be added (Differential Self-Multiplied Addition for the first filtering result c1 and the second filtering result c2 that filter module 20 is exported, be called for short DSMA) method carry out signal demodulation calculating, generate signal demodulation result of calculation d, this signal demodulation result of calculation d exports to signal detecting result storage and display module 40.Described signal demodulation computing module 30 comprises the first differentiator 301, the second differentiator 302, the first multiplier 303, the second multiplier 304, adder 305, integrator 306 and band pass filter 307, wherein:
The first differentiator 301, differentiates for the first filtering result c1 as shown in formula (3) that filter module 20 is exported, and operation result is exported to the first multiplier 303.The first multiplier 303, for the Output rusults of the first differentiator 301 is carried out to square operation, and exports to adder 305 by operation result, this operation result as shown in formula (5), wherein, J
1(C), J
2(C) be Bessel function.
The second differentiator 302, differentiates for the second filtering result c2 as shown in formula (4) that filter module 20 is exported, and operation result is exported to the second multiplier 304.The second multiplier 304, for the Output rusults of the second differentiator 302 is carried out to square operation, and exports to adder 305 by operation result, this operation result as shown in formula (6), wherein, J
1(C), J
2(C) be Bessel function.
Adder 305, carries out add operation for the Output rusults (as shown in Equation 6) of the Output rusults 303 (as shown in Equation 5) to the first multiplier and the second multiplier 304, and operation result is exported to integrator 306.Integrator 306, for the Output rusults of adder 305 is carried out to integral operation, and exports to band pass filter 307 by operation result.Band pass filter 307, for the Output rusults of integrator 306 is carried out to bandpass filtering, generates signal demodulation result of calculation.Operation result now as shown in Equation 7
In this step, in signal demodulation computing module 30, in conjunction with the setting of differential involution phase computation system and low pass filter and band pass filter, can effectively reduce harmonic distortion.It obtains modulation depth C value by algorithm, brings in formula 7, and the impact of cancellation C value, and then can effectively suppress C value and change the harmonic distortion problems of bringing; Reasonable setting by filter also can suppress harmonic distortion problems; Above method makes the present embodiment fiber-optic signal demodulating system have lower harmonic distortion.Signal detecting result correcting module 40, comprising: modified result unit 401 and signal detecting result storage and display unit 402, revise computing for the bandpass filtering result d that signal demodulation computing module 30 is exported.Wherein: modified result unit 401, be normalized correction computing for the bandpass filtering result d that signal demodulation computing module 30 is exported, and operation result is exported to signal detecting result storage and display unit 402, revised operation result is as shown in Equation 8.Signal detecting result storage and display unit 402, for carrying out digitlization storage and demonstration to revised signal detecting result.
D
scos(2πf
st) (8)
In this step, by modified result, as it is normalized, can remove the impact of light intensity changes in amplitude, and then can suppress light intensity and change the interference problem causing, thereby make the present embodiment fiber-optic signal demodulating system there is higher stability.It should be apparent to those skilled in the art that, the optical fiber interference type sensing signal demodulation system that comprises signal detecting result correcting module 40 is only preferred embodiments of the present invention, if the result that signal demodulation is calculated requires undemanding words, this signal detecting result correcting module 40 also can omit, and can not affect equally the integrality of the system of optical fiber interference type sensing signal demodulation.
A kind of method of optical fiber interference type sensing signal demodulation is also provided according to another aspect of the present invention.Fig. 2 is the schematic flow sheet of embodiment of the present invention optical fiber interference type sensing signal demodulation method.As shown in Figure 2, the present embodiment comprises:
Step S202, carries out analog digital conversion to carrier signal and the optical fiber interference signal of input respectively, generates the first digital sample result and the second digital sample result;
Step S204, carries out Frequency mixing processing and low-pass filtering to the first digital sample result and frequency multiplication thereof and the second digital sample result, generates the first filtering result and the second filtering result;
Step S206, adopts differential involution phase computation system to carry out signal demodulation calculating to the first filtering result and the second filtering result, generates signal demodulation result of calculation;
Step S208, is normalized correction computing to signal demodulation result of calculation.
In the preferred embodiment of the invention, step S204 can comprise again:
Step S204a, carries out mixing computing to the first digital sample result and the second digital sample result, and mixing operation result is carried out to low-pass filtering, generates the first filtering result;
Step S204b, the frequency multiplication to the first digital sample result and the second digital sample result are carried out mixing computing, and mixing operation result is carried out to low-pass filtering, generate the second filtering result.
In the preferred embodiment of the invention, step S206 can comprise again:
Step S206a, differentiates to the first filtering result, and the result of differentiating of the first filtering result is carried out to square operation, generates the first square operation result;
Step S206b, differentiates to the second filtering result, and the result of differentiating of the second filtering result is carried out to square operation, generates the second square operation result;
Step S206c, carries out add operation to the first square operation result and the second square operation result;
Step S206d, carries out integral operation to add operation result;
Step S206e, carries out bandpass filtering to integral operation result, generates signal demodulation result of calculation.
In addition, in device embodiment, disclosed whole features are applicable to the method embodiment too.
The data collecting card USB-9215 that the embodiment of the present invention adopts American National instrument company (NI) to produce, has completed digital optical fiber interference signal demodulating algorithm in conjunction with software LabVIEW 8.6.USB-9215 is a 4 channel/simultaneous data-acquisitions, realizes the function of high-speed a/d sampling, and its precision is 16, and sampling rate is 100KS/s, and sampling is controlled by computer.Coding in LabVIEW8.6, realizes the function of the each module shown in Fig. 1.
To sum up, above-described embodiment has provided the embodiment of optimum of the present invention, as as described in technical scheme, the part of some or step do not affect the embodiment of whole technical scheme, taking optical fiber interference signal demodulating system as example: 1, can ensure that can not affect an AD changes under sampling unit and the normal prerequisite of working of the 2nd AD conversion sampling unit, the first conditioning unit and the second conditioning unit can omit; 2, adopt fixing low-pass cut-off frequencies at the first low pass filter and the second low pass filter, frequency detecting unit can be omitted; 3, in the case of not high to the required precision of signal demodulation result, signal detecting result correcting module can omit, etc., will not enumerate at this.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. a system for optical fiber interference type sensing signal demodulation, is characterized in that, comprising:
Analog-to-digital conversion module, its input is connected with two outputs of optical fiber interference type transducing signal, for respectively carrier signal and the optical fiber interference signal of input being carried out to analog digital conversion, generates the first digital sample result and the second digital sample result;
Filter module, its input is connected with two outputs of analog-to-digital conversion module, carry out Frequency mixing processing and low-pass filtering for the first digital sample result to analog-to-digital conversion module output and frequency multiplication thereof and the second digital sample result, generate the first filtering result and the second filtering result, comprise: first signal processing unit, for the first digital sample result and the second digital sample result are carried out to mixing computing, and mixing operation result is outputed to the first low pass filter; The first low pass filter, for the mixing operation result of first signal processing unit output is carried out to low-pass filtering, generates the first filtering result; Secondary signal processing unit, carries out mixing computing for the frequency multiplication to the first digital sample result and the second digital sample result, and operation result is outputed to the second low pass filter; The second low pass filter, for the mixing operation result of secondary signal processing unit output is carried out to low-pass filtering, generates the second filtering result;
Signal demodulation computing module, its input is connected with two outputs of filter module, adopt differential involution phase computation system to carry out signal demodulation calculating for the first filtering result to filter module output and the second filtering result, generate signal demodulation result of calculation, comprise: the first differentiator, for the first filtering result is differentiated; The first multiplier, carries out square operation for the result of differentiating of the output to the first differentiator; The second differentiator, for differentiating to the second filtering result; The second multiplier, carries out square operation for the result of differentiating of the output to the second differentiator; Adder, for carrying out add operation to the square operation result of the first square operation result of multiplier output and the output of the second multiplier; Integrator, carries out integral operation for the add operation result of the output to adder; Band pass filter, for the integral operation result of integrator output is carried out to bandpass filtering, generates signal demodulation result of calculation.
2. the system of optical fiber interference type sensing signal demodulation according to claim 1, is characterized in that, described filter module also comprises:
Frequency detecting unit, be connected with the output of analog-to-digital conversion module, for detecting the highest frequency of optical fiber interference signal from the second digital sample result, using one times of this highest frequency to twice as the first low pass filter with the low-pass cut-off frequencies of the second low pass filter.
3. the system of optical fiber interference type sensing signal demodulation according to claim 1, is characterized in that, described analog-to-digital conversion module comprises:
First signal conditioning unit, is connected with the carrier signal input of optical fiber interference type transducing signal, for the carrier signal of input is carried out to signal condition, makes its voltage amplitude in the desired scope of an AD sampling unit;
The one AD sampling unit, for the output signal of first signal conditioning unit is carried out to digital collection, generates the first digital sample result;
Secondary signal conditioning unit, is connected with the optical fiber interference signal input of optical fiber interference type transducing signal, for the optical fiber interference signal of input is carried out to signal condition, makes its amplitude in the desired scope of the 2nd AD sampling unit;
The 2nd AD sampling unit, for the output signal of secondary signal conditioning unit is carried out to digital collection, generates the second digital sample result.
4. according to the system of the optical fiber interference type sensing signal demodulation described in any one in claims 1 to 3, it is characterized in that, also comprise:
Signal detecting result correcting module, for being normalized correction computing to the signal demodulation result of calculation of signal demodulation computing module output.
5. the system of optical fiber interference type sensing signal demodulation according to claim 4, is characterized in that, described signal detecting result correcting module comprises:
Modified result unit, for being normalized correction computing to the signal demodulation result of calculation of signal demodulation computing module output;
Signal detecting result storage and display unit, for carrying out digitlization storage and demonstration to the signal demodulation result of calculation of revising after computing.
6. a method for optical fiber interference type sensing signal demodulation, is characterized in that, comprising:
Respectively carrier signal and the optical fiber interference signal of input are carried out to analog digital conversion, generate the first digital sample result and the second digital sample result;
The first digital sample result and frequency multiplication thereof and the second digital sample result are carried out to Frequency mixing processing and low-pass filtering, generate the first filtering result and the second filtering result, comprising: the first digital sample result and the second digital sample result are carried out to mixing computing; Mixing operation result is carried out to low-pass filtering, generate the first filtering result; Frequency multiplication to the first digital sample result and the second digital sample result are carried out mixing computing; Mixing operation result is carried out to low-pass filtering, generate the second filtering result;
Adopt differential involution phase computation system to carry out signal demodulation calculating to the first filtering result and the second filtering result, generate signal demodulation result of calculation, comprising: the first filtering result is differentiated; To differentiating, result is carried out the first square operation; The second filtering result is differentiated; To differentiating, result is carried out the second square operation; The first square operation result and the second square operation result are carried out to add operation; Add operation result is carried out to integral operation; Integral operation result is carried out to bandpass filtering, generate signal demodulation result of calculation.
7. the method for optical fiber interference type sensing signal demodulation according to claim 6, it is characterized in that, describedly adopt differential involution phase computation system to carry out signal demodulation calculating to the first filtering result and the second filtering result, also comprise after generating the step of signal demodulation result of calculation:
Signal demodulation result of calculation is normalized to correction computing.
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| CN102620757A (en) * | 2012-03-27 | 2012-08-01 | 中国科学院半导体研究所 | System and method for demodulating optical-fiber interference-type sensing signals |
| CN105486331B (en) * | 2015-12-01 | 2017-12-19 | 哈尔滨工程大学 | One kind has high-precision optical signalling phase demodulating system and demodulation method |
| CN106969787B (en) * | 2017-02-27 | 2019-10-15 | 中国科学院声学研究所 | Signal processing method and system |
| CN107843189B (en) * | 2017-09-30 | 2019-12-27 | 浙江理工大学 | PGC demodulation real-time normalization correction device and method for sine phase modulation interferometer |
| CN108007550B (en) * | 2017-10-11 | 2020-03-24 | 中国船舶重工集团公司第七一五研究所 | Improved PGC modulation-demodulation detection method |
| CN110530496B (en) * | 2018-05-25 | 2021-05-07 | 南京理工大学 | Optical fiber sensing demodulation method based on digital filtering and binary pulse modulation |
| CN110646020B (en) * | 2019-10-30 | 2023-01-24 | 电子科技大学中山学院 | Optical fiber interference device and method |
| CN110635844A (en) * | 2019-11-05 | 2019-12-31 | 南京申威光电技术研究院有限公司 | Phase-sensitive optical time domain reflectometer type distributed optical fiber acoustic wave sensor based on improved PGC algorithm |
| CN110987373B (en) * | 2019-12-04 | 2021-08-10 | 北京自动化控制设备研究所 | Method and device for measuring phase modulation depth of interference type optical fiber sensor |
| CN115173955B (en) * | 2022-06-09 | 2023-05-12 | 烽火通信科技股份有限公司 | Demodulation method and device for optical path roof-adjusting signal |
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