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 PDFInfo
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Abstract
The invention discloses a system and a method for demodulating optical-fiber interference-type sensing signals. The system comprises an analog-to-digital conversion module, a filter module and a signal demodulation calculating module. The analog-to-digital conversion module is used for performing analog-to-digital conversion to carrier signals received and to optical fiber interference signals received to generate a first digit sampling result and a second digit sampling result respectively; the filter module is used for performing frequency-mixing processing and low-pass filtering to the first digit sampling result received and double frequencies of the first digit sampling result and to the second digit sampling result to generate a first filtering result and a second filtering result respectively; and the signal demodulation calculating module is used for performing signal demodulation calculating to the first filtering result and the second filtering result by means of a differential square addition algorithm so as to generate signal demodulation calculating results. By combination of the differential square addition algorithm with the arrangement of the low-pass filter and a bond-pass filter, harmonic distortions caused by changes of the modulation depth C value can be suppressed effectively.
Description
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)
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
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.
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.
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).
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:
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. the system that the optical fiber interference type transducing signal is carried out demodulation is characterized in that, comprising:
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.
2. the system that the optical fiber interference type transducing signal is carried out demodulation according to claim 1 is characterized in that, said analog-to-digital conversion module comprises:
The first signal condition unit is used for the carrier signal that receives is carried out signal condition, makes its voltage amplitude in the desired scope of an AD sampling unit;
The one AD sampling unit is used for the output signal of the first signal condition unit is carried out digital collection, generates the first digital sample result;
Secondary signal conditioning unit is used for the optical fiber interference signal that receives is carried out signal condition, makes its amplitude in the desired scope of the 2nd AD sampling unit;
The 2nd AD sampling unit is used for the output signal of the first signal condition unit is carried out digital collection, generates the second digital sample result.
3. the system that the optical fiber interference type transducing signal is carried out demodulation according to claim 1 is characterized in that, said filter module comprises:
First signal processing unit is used for the first digital sample result and the second digital sample result are carried out the mixing computing, and the mixing operation result is exported to first low-pass filter;
First low-pass filter is used for the mixing operation result of first signal processing unit output is carried out LPF, generates first filtered, and exports to signal demodulation computing module;
The secondary signal processing unit is used for the first digital sample result's the frequency multiplication and the second digital sample result are carried out the mixing computing, and operation result is exported to second low-pass filter;
Second low-pass filter is used for the mixing operation result of secondary signal processing unit output is carried out LPF, generates second filtered, and exports to signal demodulation computing module.
4. the system that the optical fiber interference type transducing signal is carried out demodulation according to claim 1 is characterized in that, said filter module also comprises:
Frequency detecting unit; Be connected with second low-pass filter with the output terminal and first low-pass filter of analog-to-digital conversion module; Be used for detecting the highest frequency of optical fiber interference signal from the second digital sample result, with a times of this highest frequency to the low-pass cut-off frequencies of twice as first low-pass filter and second low-pass filter.
5. the system that the optical fiber interference type transducing signal is carried out demodulation according to claim 1 is characterized in that, said signal demodulation computing module comprises:
First differentiator is used for first filtered is differentiated, and the result that will differentiate exports to first multiplier;
First multiplier is used for the result that differentiates of the output of first differentiator is carried out square operation, and the square operation result is exported to totalizer;
Second differentiator is used for second filtered is differentiated, and the result that will differentiate exports to second multiplier;
Second multiplier is used for the result that differentiates of the output of second differentiator is carried out square operation, and the square operation result is exported to totalizer;
Totalizer is used for the square operation result of the output of the square operation result of first multiplier output and second multiplier is carried out additive operation, and the additive operation result is exported to integrator;
Integrator is used for the additive operation result of the output of totalizer is carried out integral operation, and the integral operation result is exported to BPF.;
BPF. is used for the integral operation result of integrator output is carried out bandpass filtering, generates signal demodulation result of calculation.
6. according to each described system that the optical fiber interference type transducing signal is carried out demodulation in the claim 1 to 5, it is characterized in that, also comprise:
The signal detecting result correcting module is connected in the output terminal of signal demodulation computing module, is used for the signal demodulation result of calculation of signal demodulation computing module output is carried out normalization correction computing.
7. the system that the optical fiber interference type transducing signal is carried out demodulation according to claim 6 is characterized in that, said signal detecting result correcting module comprises:
Amending unit is used for the signal demodulation result of calculation of signal demodulation computing module output is carried out normalization correction computing, and normalization correction operation result is exported to signal detecting result storage and display unit as a result;
Signal detecting result storage and display unit are used for the normalization correction operation result of amending unit input is as a result carried out digitizing storage and demonstration.
8. the method that the optical fiber interference type transducing signal is carried out demodulation is applied to the described system of claim 1, it is characterized in that, comprising:
Carrier signal and 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.
9. method of the optical fiber interference type transducing signal being carried out demodulation according to claim 8; It is characterized in that; Said the first digital sample result and frequency multiplication thereof and the second digital sample result are carried out Frequency mixing processing and LPF, the step that generates first filtered and second filtered comprises:
The first digital sample result and the second digital sample result are carried out the mixing computing, the mixing operation result is carried out LPF, generate first filtered;
The frequency multiplication and the second digital sample result to the first digital sample result carry out the mixing computing, and the mixing operation result is carried out LPF, generate second filtered.
10. method of the optical fiber interference type transducing signal being carried out demodulation according to claim 9; It is characterized in that; Said to first filtered and second filtered adopt the differential involution mutually computation system carry out the signal demodulation and calculate, the step that generates signal demodulation result of calculation comprises:
First filtered is differentiated, the result that differentiates of first filtered is carried out square operation, generate the first square operation result;
Second filtered is differentiated, the result that differentiates of second filtered is carried out square operation, generate the second square operation result;
The first square operation result and the second square operation result are carried out additive operation;
The additive operation result is carried out integral operation;
The integral operation result is carried out bandpass filtering, generate signal demodulation result of calculation.
11. each described method of the optical fiber interference type transducing signal being carried out demodulation in 10 according to Claim 8; It is characterized in that; Said to first filtered and second filtered adopt the differential involution mutually computation system carry out the signal demodulation and calculate, also comprise after generating the step of signal demodulation result of calculation:
Signal demodulation result of calculation is carried out normalization correction computing, and this normalization correction operation result is carried out digitizing storage and demonstration.
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| CN107860407A (en) * | 2017-10-24 | 2018-03-30 | 华中科技大学 | A kind of demodulation method and device of Michelson sonic transducer |
| CN114076948A (en) * | 2020-08-11 | 2022-02-22 | 广东晟矽微电子有限公司 | Distance measuring device and terminal |
| CN113375785A (en) * | 2021-06-08 | 2021-09-10 | 中国人民解放军国防科技大学 | Method for detecting full-sea-depth high-stability photoelectric signal of optical fiber hydrophone |
| CN113375785B (en) * | 2021-06-08 | 2022-04-15 | 中国人民解放军国防科技大学 | Method for detecting full-sea-depth high-stability photoelectric signal of optical fiber hydrophone |
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