CN102620757A - System and method for demodulating optical-fiber interference-type sensing signals - Google Patents

System and method for demodulating optical-fiber interference-type sensing signals Download PDF

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CN102620757A
CN102620757A CN2012100833266A CN201210083326A CN102620757A CN 102620757 A CN102620757 A CN 102620757A CN 2012100833266 A CN2012100833266 A CN 2012100833266A CN 201210083326 A CN201210083326 A CN 201210083326A CN 102620757 A CN102620757 A CN 102620757A
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王国庆
徐团伟
李芳�
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Institute of Semiconductors of CAS
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Abstract

本发明公开了一种对光纤干涉型传感信号进行解调的系统及方法。该系统包括：模数转换模块，用于对接收的载波信号进行模拟数字转换生成第一数字采样结果，对接收的光纤干涉信号进行模拟数字转换生成第二数字采样结果；滤波器模块，用于对接收的第一数字采样结果及其倍频进行混频处理和低通滤波生成第一滤波结果，对接收的第二数字采样结果进行混频处理和低通滤波生成第二滤波结果；信号解调计算模块，用于采用微分自乘相加算法对接收的该第一滤波结果和该第二滤波结果进行信号解调计算，生成信号解调计算结果。本发明结合微分自乘相加算法和低通滤波器与带通滤波器的设置，其能够有效的抑制调制深度C值变化带来的谐波失真问题。

Figure 201210083326

The invention discloses a system and method for demodulating optical fiber interference type sensing signals. The system includes: an analog-to-digital conversion module, which is used to perform analog-to-digital conversion on the received carrier signal to generate a first digital sampling result, and perform analog-to-digital conversion to a received optical fiber interference signal to generate a second digital sampling result; a filter module for Perform frequency mixing processing and low-pass filtering on the received first digital sampling result and its multiple frequency to generate a first filtering result, perform frequency mixing processing and low-pass filtering on the received second digital sampling result to generate a second filtering result; signal solution The modulation calculation module is used to perform signal demodulation calculation on the received first filtering result and the second filtering result by using a differential self-multiplication and addition algorithm, and generate a signal demodulation calculation result. The invention combines the differential self-multiplication and addition algorithm and the setting of the low-pass filter and the band-pass filter, which can effectively suppress the harmonic distortion problem caused by the change of the modulation depth C value.

Figure 201210083326

Description

A kind of system and method that the optical fiber interference type transducing signal is carried out demodulation
Technical field
The present invention relates to technical field of optical fiber communication, relate in particular to a kind of system and method that the optical fiber interference type transducing signal is carried out demodulation.
Background technology
That the optical fiber interference type sensor itself has is highly sensitive, response speed fast, wide dynamic range, passivity, explosion-proof, anti-electromagnetic interference (EMI), superelevation electrical isolation, corrosion-resistant, volume is little, in light weight, low cost and other advantages; Binding signal is separated the mediation multiplexing technique, and it can realize demodulation extremely low frequency signal; Simultaneously also have high precision, high stability, high linearity, be easy to the advantage that networking is multiplexing, harmonic distortion is low, seismic survey, ocean resources exploration, geophysical research and under water aspect such as military confrontation have and use future extremely widely.
In the multiple demodulation method of optical fiber interference type sensor; Phase generated carrier (Phase Generator Carrier; Abbreviation PGC) demodulation techniques are a kind of passive demodulation techniques; It has high resolving power, high linearity, low harmonics distortion, great dynamic range, stability better, do not rely on optical device, multiplexing advantage is comparatively stablized, is easy to performance, uses the most extensive.
Algorithm based on the 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 possibly introduce pseudo-phase information simultaneously; The latter does not then exist light intensity to change the interference problem that causes, have advantages of higher stability, but it requires the strictness of depth of modulation C value to equal 2.63, otherwise bigger harmonic distortion can occur.
Summary of the invention
The technical matters that (one) will solve
For solving above-mentioned one or more problems, the invention provides a kind of system and method that the optical fiber interference type transducing signal is carried out demodulation, to suppress harmonic distortion problems, improve stability.
(2) technical scheme
According to an aspect of the present invention; A kind of system that the optical fiber interference type transducing signal is carried out demodulation is provided; This system comprises: analog-to-digital conversion module; Be used for that the carrier signal that receives is carried out the analog digital conversion and generate the first digital sample result, the optical fiber interference signal that receives is carried out the analog digital conversion generate the second digital sample result, and this first digital sample result and this second digital sample result are exported to filter module; Filter module; Be used for the first digital sample result that receives and frequency multiplication is carried out Frequency mixing processing and LPF generates first filtered; The second digital sample result who receives is carried out Frequency mixing processing with LPF generates second filtered, and this first filtered and this second filtered are exported to signal demodulation computing module; Signal demodulation computing module, this first filtered that is used to adopt the butt joint of differential involution phase computation system to receive is carried out signal demodulation calculating with this second filtered, generates signal demodulation result of calculation.
According to another aspect of the present invention; A kind of method of the optical fiber interference type transducing signal being carried out demodulation also is provided; This method comprises: carrier signal and the optical fiber interference signal to input carries out the analog digital conversion respectively, generates 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 Frequency mixing processing and LPF, generate first filtered and second filtered; To first filtered and second filtered adopt the differential involution mutually computation system carry out the signal demodulation and calculate, generate signal demodulation result of calculation.
(3) beneficial effect
Can find out that from technique scheme the present invention has following beneficial effect to the system and method that the optical fiber interference type transducing signal carries out demodulation:
1, harmonic distortion is low: combine the setting of differential involution phase computation system and low-pass filter and BPF., can effectively reduce harmonic distortion;
2, stability is high: through the influence that correction as a result can be removed the light intensity amplitude, can suppress light intensity and change the interference problem that causes, have advantages of higher stability;
3, easy to operate: as can to realize through total digitalization, be convenient to adjustment and application.
Description of drawings
Fig. 1 is the structural representation of embodiment of the invention optical fiber interference type sensing signal demodulation system;
Fig. 2 is the schematic flow sheet of embodiment of the invention optical fiber interference type sensing signal demodulation method.
[main element symbol description]
The 10-analog-to-digital conversion module;
The 101-first signal condition unit; 102-secondary signal conditioning unit;
103-the one AD sampling unit; 104-the 2nd AD sampling unit;
The 20-filter module;
201-first signal processing unit; 202-secondary signal processing unit;
The 203-frequency detecting unit; 204-first low-pass filter;
205-second low-pass filter;
30-signal demodulation computing module;
301-first differentiator; 302-second differentiator;
303-first multiplier; 304-second multiplier;
The 305-totalizer; The 306-integrator; The 307-BPF.;
Storage of 40-signal detecting result and display module
401-is amending unit as a result; Storage of 402-signal detecting result and display unit.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, to further explain of the present invention.Though this paper can provide the demonstration of the parameter that comprises particular value, should be appreciated that parameter need not definitely to equal corresponding value, but can in acceptable error margin or design constraint, be similar to corresponding value.
The present invention proposes a kind of new method that is different from two kinds of PGC demodulation methods of prior art-differential multiplication cross (DCM) algorithm and arc tangent (Arctan) algorithm; This method adopts the algorithm of differential involution addition; Setting in conjunction with low-pass filter and BPF.; And suitable demodulation result is handled and demarcated, thereby demodulation transducing signal accurately.
In one exemplary embodiment of the present invention, a kind of system that the optical fiber interference type transducing signal is carried out demodulation has been proposed.Fig. 1 is the structural representation of embodiment of the invention optical fiber interference type sensing signal demodulation system.As shown in Figure 1, 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 being formed module is elaborated.
At first, for ease of explanation, establish carrier signal a1 and optical fiber interference signal a2 without conditioning respectively as shown in the formula shown in (1), (2):
x(t)＝acos(2πft) (1)
Figure BDA0000147215590000041
Wherein, A, A and B are the amplitude of signal x (t), y (t); C is a depth of modulation; F is a frequency modulating signal, and
Figure BDA0000147215590000042
is signal to be demodulated.
Analog-to-digital conversion module 10; Its two input ends are reception carrier signal a1 and optical fiber interference signal a2 respectively; Be used for that the carrier signal a1 that receives is carried out the analog digital conversion and generate first digital sample b1 as a result; The optical fiber interference signal a2 that receives is carried out the analog digital conversion generates second digital sample b2 as a result, and with this first digital sample as a result b1 and this second digital sample as a result b2 export to filter module 20.
As shown in Figure 1, analog-to-digital conversion module 10 comprises the first signal condition unit 101, secondary signal conditioning unit 102, an AD sampling unit 103 and the 2nd AD sampling unit 104.Wherein: the first signal condition unit 101, be used for the carrier signal a1 of input is carried out signal condition, make its voltage amplitude in an AD sampling unit 103 desired scopes.Secondary signal conditioning unit 102 is used for the optical fiber interference signal a2 of input is carried out signal condition, makes its amplitude in the 2nd AD sampling unit 104 desired scopes.Preferably, an AD sampling unit 103 and the 2nd AD sampling unit 104 desired voltage amplitude scopes are ± 10V.The one AD sampling unit 103 is used for digital collection is carried out in the output of the first signal condition unit 101, accomplishes the analog digital conversion, generates first digital sample b1 as a result.The 2nd AD sampling unit 104 is used for digital collection is carried out in the output of first signal condition 102, accomplishes the analog digital conversion, generates second digital sample b2 as a result, and sampling rate and AD sampling 103 keep synchronously.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 an AD sampling unit of the optical fiber interference type transducing signal that can guarantee to import and the scope of the 2nd AD sampling unit; The first signal condition unit 101 also can omit with secondary signal conditioning unit 102, and the 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 two input ends are connected to two output terminals of analog-to-digital conversion module 10; Be used for first digital sample that receives b1 and frequency multiplication is carried out Frequency mixing processing and LPF generates the first filtered c1 as a result; To second digital sample that receives as a result b2 carry out Frequency mixing processing with LPF generates the second filtered c2, and this first filtered c1 and this second filtered c2 are exported 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, first low-pass filter 204 and second low-pass filter 205.Wherein: first signal processing unit 201, be used for to first digital sample as a result b1 and second digital sample as a result b2 carry out the mixing computing, and operation result is exported to first low-pass filter 204.Secondary signal processing unit 202, be used for to first digital sample as a result b1 frequency multiplication and second digital sample as a result b2 carry out the mixing computing, and operation result is exported to second low-pass filter 205.
Frequency detecting unit 203; Be connected with second low-pass filter 205 with the output terminal and first low-pass filter 204 of analog-to-digital conversion module 10; Be used for after the analog to digital conversion optical fiber interference signal-second digital sample as a result b2 detect its highest frequency; To the low-pass cut-off frequencies of twice as first low-pass filter 204 and second low-pass filter 205, this low-pass cut-off frequencies is generally 2KHz～4KHz with a times of this frequency.
First low-pass filter 204 is used for first signal processing unit, 201 output results are carried out LPF, generates the first filtered c1, and filtered is shown in formula (3).Second low-pass filter 205 is used for that secondary signal is handled 202 output results and carries out LPF, generates the second filtered c2.The filter low pass setting is controlled by frequency detecting unit 203 output results, and the wave filter setting of second low-pass filter 205 keeps identical with first low-pass filter 204, and filtered is shown in formula (4).
Figure BDA0000147215590000052
Signal demodulation computing module 30; Its input end is connected with the output terminal of filter module 20; Be used for the first filtered c1 and the second filtered c2 of filter module 20 outputs are adopted differential involution addition (Differential Self-Multiplied Addition; Abbreviation DSMA) method is carried out signal demodulation calculating, generates signal demodulation result of calculation d, and this signal demodulation result of calculation d exports to signal detecting result storage and display module 40.Described signal demodulation computing module 30 comprises first differentiator 301, second differentiator 302, first multiplier 303, second multiplier 304, totalizer 305, integrator 306 and BPF. 307, wherein:
First differentiator 301 is used for the first filtered c1 shown in formula (3) of filter module 20 outputs is differentiated, and operation result is exported to first multiplier 303.First multiplier 303 is used for the output result of first differentiator 301 is carried out square operation, and operation result is exported to totalizer 305, this operation result shown in formula (5), wherein, J 1(C), J 2(C) be Bessel's function.
Figure BDA0000147215590000061
Second differentiator 302 is used for the second filtered c2 shown in formula (4) of filter module 20 outputs is differentiated, and operation result is exported to second multiplier 304.Second multiplier 304 is used for the output result of second differentiator 302 is carried out square operation, and operation result is exported to totalizer 305, this operation result shown in formula (6), wherein, J 1(C), J 2(C) be Bessel's function.
Figure BDA0000147215590000062
Totalizer 305, the output result 303 (shown in formula 5) and the output result (shown in formula 6) of second multiplier 304 that are used for first multiplier carry out additive operation, and operation result is exported to integrator 306.Integrator 306 is used for the output result of totalizer 305 is carried out integral operation, and operation result is exported to BPF. 307.BPF. 307 is used for the output result of integrator 306 is carried out bandpass filtering, generates signal demodulation result of calculation.The operation result of this moment is shown in formula 7
Figure BDA0000147215590000063
In this step, combine the setting of differential involution phase computation system and low-pass filter and BPF. in the signal demodulation computing module 30, can effectively reduce harmonic distortion.It obtains depth of modulation C value through algorithm, brings in the formula 7, and the influence of cancellation C value, and then can effectively suppress the harmonic distortion problems that the variation of C value brings; Reasonable setting through wave filter also can suppress harmonic distortion problems; Above method makes present embodiment fiber-optic signal demodulating system have lower harmonic distortion.Signal detecting result correcting module 40; Comprise: amending unit 401 is stored and display unit 402 with signal detecting result as a result; Be used for to the bandpass filtering of signal demodulation computing module 30 output as a result d revise computing, and this normalization correction operation result is carried out the digitizing storage and shows.Wherein: amending unit 401 as a result; Be used for to the bandpass filtering of signal demodulation computing module 30 output as a result d carry out normalization correction computing; And operation result is exported to signal detecting result store and display unit 402, revised operation result is shown in formula 8.Signal detecting result storage and display unit 402 are used for revised signal detecting result is carried out digitizing storage and demonstration.
D scos(2πf st) (8)
In this step,, handle as it being carried out normalization through correction as a result, the influence that can remove the light intensity changes in amplitude, and then can suppress the interference problem that the light intensity variation causes, thus make present embodiment fiber-optic signal demodulating system have advantages of 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 only is the preferred scheme of the present invention; If signal demodulation result calculated is required undemanding words; This signal detecting result correcting module 40 also can omit, and can not influence the integrality of the optical fiber interference type transducing signal being carried out the system of demodulation equally.
According to another aspect of the present invention, a kind of method of the optical fiber interference type transducing signal being carried out demodulation also is provided.Fig. 2 is the schematic flow sheet of embodiment of the invention optical fiber interference type sensing signal demodulation method.As shown in Figure 2, present embodiment comprises:
Step S202, carrier signal and the optical fiber interference signal to input carries out the analog digital conversion respectively, generates the first digital sample result and the second digital sample result;
Step S204 carries out Frequency mixing processing and LPF to the first digital sample result and frequency multiplication thereof and the second digital sample result, generates first filtered and second filtered;
Step S206, to first filtered and second filtered adopt the differential involution mutually computation system carry out the signal demodulation and calculate, generate signal demodulation result of calculation;
Step S208 carries out normalization correction computing to signal demodulation result of calculation.
In the preferred embodiment of the invention, step S204 can comprise again:
Step S204a carries out the mixing computing to the first digital sample result and the second digital sample result, and the mixing operation result is carried out LPF, generates first filtered;
Step S204b carries out the mixing computing to the first digital sample result's the frequency multiplication and the second digital sample result, and the mixing operation result is carried out LPF, generates second filtered.
In the preferred embodiment of the invention, step S206 can comprise again:
Step S206a differentiates to first filtered, and the result that differentiates of first filtered is carried out square operation, generates the first square operation result;
Step S206b differentiates to second filtered, and the result that differentiates of second filtered is carried out square operation, generates the second square operation result;
Step S206c carries out additive operation to the first square operation result and the second square operation result;
Step S206d carries out integral operation to the additive operation result;
Step S206e carries out bandpass filtering to the integral operation result, generates signal demodulation result of calculation.
In addition, disclosed whole characteristics are applicable to this method embodiment too in device embodiment.
The data collecting card USB-9215 that the embodiment of the invention adopts American National instrument company (NI) to produce has accomplished digital optical fiber interference signal demodulating algorithm in conjunction with software LabVIEW 8.6.USB-9215 is a 4 passage synchronous data collection cards, 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 computing machine.Coding in LabVIEW8.6, the function of each module shown in realization Fig. 1.
To sum up; The foregoing description has provided the optimum embodiment of the present invention; As as described in technical scheme; Ingredient of some or step do not influence the embodiment of whole technical proposal, are example with the optical fiber interference signal demodulating system: 1, under the prerequisite that can guarantee can not to influence AD conversion sampling unit and the 2nd AD conversion sampling unit operate as normal, the first conditioning unit and the second conditioning unit can omit; 2, adopt under the situation of fixing low-pass cut-off frequencies at first low-pass filter and second low-pass filter, frequency detecting unit can be omitted; 3, under to the not high situation of the accuracy requirement of signal demodulation result, the signal detecting result correcting module can omit, or the like, enumerate no longer one by one at this.
Above-described specific embodiment; The object of the invention, technical scheme and beneficial effect have been carried out further explain, and institute it should be understood that the above is merely specific embodiment of the present invention; Be not limited to the present invention; All within spirit of the present invention and principle, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (11)

1.一种对光纤干涉型传感信号进行解调的系统，其特征在于，包括：1. A system for demodulating optical fiber interference type sensing signals, characterized in that, comprising: 模数转换模块，用于对接收的载波信号进行模拟数字转换生成第一数字采样结果，对接收的光纤干涉信号进行模拟数字转换生成第二数字采样结果，并将该第一数字采样结果和该第二数字采样结果输出给滤波器模块；The analog-to-digital conversion module is used to perform analog-to-digital conversion on the received carrier signal to generate a first digital sampling result, perform analog-to-digital conversion on the received optical fiber interference signal to generate a second digital sampling result, and combine the first digital sampling result with the The second digital sampling result is output to the filter module; 滤波器模块，用于对接收的第一数字采样结果及其倍频进行混频处理和低通滤波生成第一滤波结果，对接收的第二数字采样结果进行混频处理和低通滤波生成第二滤波结果，并将该第一滤波结果和该第二滤波结果输出给信号解调计算模块；The filter module is used to perform frequency mixing processing and low-pass filtering on the received first digital sampling result and its multiple frequency to generate the first filtering result, and perform frequency mixing processing and low-pass filtering on the received second digital sampling result to generate the second digital sampling result Two filter results, and output the first filter result and the second filter result to the signal demodulation calculation module; 信号解调计算模块，用于采用微分自乘相加算法对接收的该第一滤波结果和该第二滤波结果进行信号解调计算，生成信号解调计算结果。The signal demodulation calculation module is used to perform signal demodulation calculation on the received first filtering result and the second filtering result by using a differential self-multiplication and addition algorithm, and generate a signal demodulation calculation result. 2.根据权利要求1所述的对光纤干涉型传感信号进行解调的系统，其特征在于，所述模数转换模块包括：2. The system for demodulating the optical fiber interference type sensing signal according to claim 1, wherein the analog-to-digital conversion module comprises: 第一信号调理单元，用于对接收的载波信号进行信号调理，使其电压幅度在第一AD采样单元所要求的范围内；The first signal conditioning unit is used to perform signal conditioning on the received carrier signal so that its voltage amplitude is within the range required by the first AD sampling unit; 第一AD采样单元，用于对第一信号调理单元的输出信号进行数字化采集，生成第一数字采样结果；The first AD sampling unit is used to digitally collect the output signal of the first signal conditioning unit to generate a first digital sampling result; 第二信号调理单元，用于对接收的光纤干涉信号进行信号调理，使其幅度在第二AD采样单元所要求的范围内；The second signal conditioning unit is used to perform signal conditioning on the received optical fiber interference signal so that its amplitude is within the range required by the second AD sampling unit; 第二AD采样单元，用于对第一信号调理单元的输出信号进行数字化采集，生成第二数字采样结果。The second AD sampling unit is configured to digitally collect the output signal of the first signal conditioning unit to generate a second digital sampling result. 3.根据权利要求1所述的对光纤干涉型传感信号进行解调的系统，其特征在于，所述滤波器模块包括：3. The system for demodulating the optical fiber interference type sensing signal according to claim 1, wherein the filter module comprises: 第一信号处理单元，用于对第一数字采样结果与第二数字采样结果进行混频运算，并将混频运算结果输出给第一低通滤波器；The first signal processing unit is configured to perform a frequency mixing operation on the first digital sampling result and the second digital sampling result, and output the frequency mixing operation result to the first low-pass filter; 第一低通滤波器，用于对第一信号处理单元输出的混频运算结果进行低通滤波，生成第一滤波结果，并输出给信号解调计算模块；The first low-pass filter is used to perform low-pass filtering on the frequency mixing operation result output by the first signal processing unit, generate a first filtering result, and output it to the signal demodulation calculation module; 第二信号处理单元，用于对第一数字采样结果的倍频与第二数字采样结果进行混频运算，并将运算结果输出给第二低通滤波器；The second signal processing unit is used to perform frequency mixing operation on the frequency multiplication of the first digital sampling result and the second digital sampling result, and output the operation result to the second low-pass filter; 第二低通滤波器，用于对第二信号处理单元输出的混频运算结果进行低通滤波，生成第二滤波结果，并输出给信号解调计算模块。The second low-pass filter is configured to perform low-pass filtering on the frequency mixing operation result output by the second signal processing unit, generate a second filtering result, and output it to the signal demodulation calculation module. 4.根据权利要求1所述的对光纤干涉型传感信号进行解调的系统，其特征在于，所述滤波器模块还包括：4. The system for demodulating the optical fiber interference type sensing signal according to claim 1, wherein the filter module further comprises: 频率检测单元，与模数转换模块的输出端及第一低通滤波器和第二低通滤波器相连接，用于从第二数字采样结果中检测出光纤干涉信号的最高频率，将该最高频率的一倍至两倍作为第一低通滤波器和第二低通滤波器的低通截止频率。The frequency detection unit is connected with the output terminal of the analog-to-digital conversion module and the first low-pass filter and the second low-pass filter, and is used to detect the highest frequency of the optical fiber interference signal from the second digital sampling result, and the highest frequency One to two times the frequency is used as the low-pass cut-off frequency of the first low-pass filter and the second low-pass filter. 5.根据权利要求1所述的对光纤干涉型传感信号进行解调的系统，其特征在于，所述信号解调计算模块包括：5. The system for demodulating the optical fiber interference type sensing signal according to claim 1, wherein the signal demodulation calculation module comprises: 第一微分器，用于对第一滤波结果进行微分运算，并将微分运算结果输出给第一乘法器；a first differentiator, configured to perform a differential operation on the first filtering result, and output the differential operation result to the first multiplier; 第一乘法器，用于对第一微分器的输出的微分运算结果进行平方运算，并将平方运算结果输出给加法器；The first multiplier is used to perform a square operation on the differential operation result output by the first differentiator, and output the square operation result to the adder; 第二微分器，用于对第二滤波结果进行微分运算，并将微分运算结果输出给第二乘法器；a second differentiator, configured to perform a differential operation on the second filtering result, and output the differential operation result to the second multiplier; 第二乘法器，用于对第二微分器的输出的微分运算结果进行平方运算，并将平方运算结果输出给加法器；The second multiplier is used to perform a square operation on the differential operation result output by the second differentiator, and output the square operation result to the adder; 加法器，用于对第一乘法器输出的平方运算结果和第二乘法器的输出的平方运算结果进行加法运算，并将加法运算结果输出给积分器；An adder is used to perform an addition operation on the square operation result output by the first multiplier and the square operation result output by the second multiplier, and output the addition operation result to the integrator; 积分器，用于对加法器的输出的加法运算结果进行积分运算，并将积分运算结果输出给带通滤波器；The integrator is used to perform an integral operation on the addition result of the output of the adder, and output the integral operation result to the bandpass filter; 带通滤波器，用于对积分器输出的积分运算结果进行带通滤波，生成信号解调计算结果。The band-pass filter is used for performing band-pass filtering on the integral operation result output by the integrator to generate a signal demodulation calculation result. 6.根据权利要求1至5中任一项所述的对光纤干涉型传感信号进行解调的系统，其特征在于，还包括：6. The system for demodulating the optical fiber interference type sensing signal according to any one of claims 1 to 5, further comprising: 信号检测结果修正模块，连接于信号解调计算模块的输出端，用于对信号解调计算模块输出的信号解调计算结果进行归一化修正运算。The signal detection result correction module is connected to the output terminal of the signal demodulation calculation module, and is used for normalizing and correcting the signal demodulation calculation result output by the signal demodulation calculation module. 7.根据权利要求6所述的对光纤干涉型传感信号进行解调的系统，其特征在于，所述信号检测结果修正模块包括：7. The system for demodulating optical fiber interference type sensing signals according to claim 6, wherein the signal detection result correction module comprises: 结果修正单元，用于对信号解调计算模块输出的信号解调计算结果进行归一化修正运算，并将归一化修正运算结果输出给信号检测结果存储及显示单元；The result correction unit is used to perform a normalized correction operation on the signal demodulation calculation result output by the signal demodulation calculation module, and output the normalized correction operation result to the signal detection result storage and display unit; 信号检测结果存储及显示单元，用于对结果修正单元输入的归一化修正运算结果进行数字化存储和显示。The signal detection result storage and display unit is used for digitally storing and displaying the normalized correction operation result input by the result correction unit. 8.一种对光纤干涉型传感信号进行解调的方法，应用于权利要求1所述的系统，其特征在于，包括：8. A method for demodulating optical fiber interference type sensing signals, applied to the system according to claim 1, characterized in that, comprising: 分别对输入的载波信号和光纤干涉信号进行模拟数字转换，生成第一数字采样结果和第二数字采样结果；respectively performing analog-to-digital conversion on the input carrier signal and the optical fiber interference signal to generate a first digital sampling result and a second digital sampling result; 对第一数字采样结果及其倍频和第二数字采样结果进行混频处理和低通滤波，生成第一滤波结果和第二滤波结果；performing frequency mixing and low-pass filtering on the first digital sampling result and its multiplier and the second digital sampling result to generate a first filtering result and a second filtering result; 对第一滤波结果和第二滤波结果采用微分自乘相加算法进行信号解调计算，生成信号解调计算结果。A signal demodulation calculation is performed on the first filtering result and the second filtering result by using a differential square multiplication and addition algorithm to generate a signal demodulation calculation result. 9.根据权利要求8所述的对光纤干涉型传感信号进行解调的方法，其特征在于，所述对第一数字采样结果及其倍频和第二数字采样结果进行混频处理和低通滤波，生成第一滤波结果和第二滤波结果的步骤包括：9. The method for demodulating the optical fiber interference type sensing signal according to claim 8, characterized in that, the first digital sampling result and its frequency multiplication and the second digital sampling result are mixed and processed Through filtering, the steps of generating the first filtering result and the second filtering result include: 对第一数字采样结果与第二数字采样结果进行混频运算，对混频运算结果进行低通滤波，生成第一滤波结果；performing a frequency mixing operation on the first digital sampling result and the second digital sampling result, and performing low-pass filtering on the frequency mixing operation result to generate a first filtering result; 对第一数字采样结果的倍频与第二数字采样结果进行混频运算，对混频运算结果进行低通滤波，生成第二滤波结果。A frequency mixing operation is performed on the multiplied frequency of the first digital sampling result and the second digital sampling result, and a low-pass filter is performed on the frequency mixing operation result to generate a second filtering result. 10.根据权利要求9所述的对光纤干涉型传感信号进行解调的方法，其特征在于，所述对第一滤波结果和第二滤波结果采用微分自乘相加算法进行信号解调计算，生成信号解调计算结果的步骤包括：10. The method for demodulating the optical fiber interference type sensing signal according to claim 9, characterized in that, the first filtering result and the second filtering result are calculated by using a differential self-multiplication and addition algorithm for signal demodulation , the steps of generating the calculation result of signal demodulation include: 对第一滤波结果进行微分运算，对第一滤波结果的微分运算结果进行平方运算，生成第一平方运算结果；performing a differential operation on the first filtering result, performing a square operation on the differential operation result of the first filtering result, and generating a first square operation result; 对第二滤波结果进行微分运算，对第二滤波结果的微分运算结果进行平方运算，生成第二平方运算结果；Performing a differential operation on the second filtering result, performing a square operation on the differential operation result of the second filtering result, and generating a second square operation result; 对第一平方运算结果和第二平方运算结果进行加法运算；performing an addition operation on the result of the first square operation and the result of the second square operation; 对加法运算结果进行积分运算；Integrate the result of the addition operation; 对积分运算结果进行带通滤波，生成信号解调计算结果。Perform band-pass filtering on the integral operation result to generate the signal demodulation calculation result. 11.根据权利要求8至10中任一项所述的对光纤干涉型传感信号进行解调的方法，其特征在于，所述对第一滤波结果和第二滤波结果采用微分自乘相加算法进行信号解调计算，生成信号解调计算结果的步骤之后还包括：11. The method for demodulating the optical fiber interference type sensing signal according to any one of claims 8 to 10, characterized in that, the first filtering result and the second filtering result adopt differential self-multiplication and addition The algorithm performs signal demodulation calculation, and after the step of generating the signal demodulation calculation result, it also includes: 对信号解调计算结果进行归一化修正运算，并对该归一化修正运算结果进行数字化存储和显示。The normalized correction operation is performed on the signal demodulation calculation result, and the normalized correction operation result is digitally stored and displayed.
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