CN106603163B - A kind of signal processing circuit - Google Patents
A kind of signal processing circuit Download PDFInfo
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- CN106603163B CN106603163B CN201611248378.9A CN201611248378A CN106603163B CN 106603163 B CN106603163 B CN 106603163B CN 201611248378 A CN201611248378 A CN 201611248378A CN 106603163 B CN106603163 B CN 106603163B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention discloses a kind of signal processing circuits, including optical frequency shifter, analog-to-digital conversion module and the first processing circuit；Analog-to-digital conversion module is connected with photodetector, optical frequency shifter respectively, analog-to-digital conversion the first signal of output is carried out for photodetector to be acquired the analog signal that mixing interference light obtains, the local oscillation signal of optical frequency shifter output is subjected to analog-to-digital conversion and exports second signal；First processing circuit includes power splitter, the first computing module, phase shifter, low-pass filter and the second computing module；First processing circuit carries out related algorithm operation to two paths of signals, demodulates the vibration signal of characterization target surface vibration.Signal processing circuit of the present invention uses digital demodulation mode, higher to the demodulation process precision of mixing interference light with existing using compared with analog demodulation circuit, is influenced by environmental factor small, and reliability is higher.
Description
Technical field
The present invention relates to signal processing circuit technical fields, more particularly to a kind of signal processing circuit.
Background technique
In laser coherence micro-vibration detection system, optical system issues detection light to target, anti-by intended vibratory surface
The return light being emitted back towards is loaded with the vibration information of target surface, and optical system receives return light, return light and reference light are converged,
The vibration signal of characterization target surface vibration can be demodulated according to the mixing interference light to be formed is converged, realizes and shakes to target surface
Dynamic detection.
In the prior art, mixing interference light is carried out processing to obtain the processing mode of vibration signal being using analog demodulator side
Formula, but that there are demodulation accuracies is low, the shortcomings that influencing vulnerable to environmental factor such as temperature etc. for analog demodulation circuit.
Summary of the invention
The object of the present invention is to provide a kind of signal processing circuits, using digital demodulation mode, to the solution of mixing interference light
Adjust processing accuracy higher, reliability is higher.
To achieve the above object, the invention provides the following technical scheme:
A kind of signal processing circuit, including optical frequency shifter, analog-to-digital conversion module and the first processing circuit；
The analog-to-digital conversion module is connected with photodetector, the optical frequency shifter respectively, is used for the photodetection
The analog signal that device acquisition mixing interference light obtains carries out analog-to-digital conversion and exports the first signal, the sheet that the optical frequency shifter is exported
The signal that shakes carries out analog-to-digital conversion and exports second signal；
First processing circuit includes power splitter, the first computing module, phase shifter, low-pass filter and the second operation mould
Block；
The two paths of signals exported by the analog-to-digital conversion module inputs the power splitter respectively, and the power splitter is by described
One signal is divided into two-way, inputs first computing module respectively；
The second signal is divided into two-way by the power splitter, wherein signal inputs first computing module all the way, with
The signal all the way of first signal carries out multiplication operation, and another way signal inputs described the after phase shifter phase shift processing
One computing module carries out multiplication operation with the another way signal of first signal；
Two-way base band letter is obtained after low-pass filter processing by the two paths of signals of first computing module output
Number, be input to second computing module be divided by and arctangent cp cp operation processing, obtain vibration signal.
Optionally, first processing circuit further include be connected to the power splitter input terminal, for input
First bandpass filter of one signal progress bandpass filtering treatment.
Optionally, it is connected with relay amplifier between first bandpass filter and the power splitter, for that will believe
It number is amplified to equal with the second signal amplitude.
Optionally, the phase shifter is used to signal carrying out 90 degree of phase shifts.
Optionally, it is connected between the photodetector and the analog-to-digital conversion module for being amplified to signal
Amplifier；
The amplifier for amplifying to signal is connected between the optical frequency shifter and the analog-to-digital conversion module.
It optionally, further include the second processing circuit being connect with first processing circuit, for according at described first
The vibration signal of reason circuit output restores voice signal.
Optionally, the second processing circuit includes:
Sampling circuit, for being sampled to the vibration signal of input；
Second bandpass filter, for carrying out the filtering in voice frequency range to signal；
Speech processor, for going out voice signal according to signals revivification.
Optionally, the second processing circuit is also used to that the voice signal that reduction obtains is stored and exported.
Optionally, the second processing circuit further includes the loudspeaker for playing voice signal.
Optionally, first processing circuit uses programmable gate array, and the second processing circuit is using number
Signal processing chip.
As shown from the above technical solution, signal processing circuit provided by the present invention, including optical frequency shifter, analog-to-digital conversion mould
Block and the first processing circuit, the first processing circuit include power splitter, the first computing module, phase shifter, low-pass filter and second
Computing module.
Photodetector is acquired the analog signal that mixing interference light obtains and carries out analog-to-digital conversion output by analog-to-digital conversion module
The local oscillation signal of optical frequency shifter output is carried out analog-to-digital conversion and exports second signal by the first signal；Two paths of signals distinguishes input work
Divide device, the first signal is divided into two-way, inputs the first computing module respectively by the power splitter；The power splitter divides second signal
At two-way, wherein signal inputs the first computing module all the way, multiplication operation is carried out with the signal all the way that the first signal is divided into, it is another
The first computing module is inputted after the shifted device phase shift processing of road signal, carries out multiplication operation with the another way signal of the first signal.
Two-way baseband signal is obtained after the low-pass filtered device processing of the two paths of signals exported by the first computing module, is input to
Second computing module is divided by and arctangent cp cp operation processing, obtains vibration signal.
Compared with prior art, signal processing circuit of the present invention uses digital demodulation mode, the demodulation to mixing interference light
Processing accuracy is higher, is influenced by environmental factor small, and reliability is higher.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of schematic diagram of signal processing circuit provided in an embodiment of the present invention；
Fig. 2 is a kind of schematic diagram for signal processing circuit that further embodiment of this invention provides.
Specific embodiment
The present invention provides a kind of signal processing circuit, is applied in laser coherence micro-vibration detection system, for by mesh
The return light that mark vibration surface is reflected back converges the interference light that is mixed to be formed with reference light and is handled and demodulated, and is obtained with reduction
Characterize the vibration signal of target surface vibration.
Referring to FIG. 1, a kind of signal processing circuit provided in an embodiment of the present invention, including optical frequency shifter 10, analog-to-digital conversion
Module 11 and the first processing circuit 12；
The analog-to-digital conversion module 11 is connected with photodetector, the optical frequency shifter 10 respectively, is used for the photoelectricity
The analog signal that detector acquisition mixing interference light obtains carries out analog-to-digital conversion and exports the first signal, and the optical frequency shifter 10 is defeated
Local oscillation signal out carries out analog-to-digital conversion and exports second signal；
First processing circuit 12 includes power splitter 120, the first computing module 121, phase shifter 122, low-pass filter
123 and second computing module 124；
The power splitter 120, the power splitter 120 are inputted by the two paths of signals that the analog-to-digital conversion module 11 exports respectively
First signal is divided into two-way, inputs first computing module 121 respectively；
The second signal is divided into two-way by the power splitter 120, wherein signal inputs first computing module all the way
121, multiplication operation is carried out with the signal all the way of first signal, another way signal is after 122 phase shift of phase shifter processing
First computing module 121 is inputted, carries out multiplication operation with the another way signal of first signal；
The two paths of signals exported by first computing module 121 obtains two-way after the low-pass filter 123 processing
Baseband signal, be input to second computing module 124 be divided by and arctangent cp cp operation processing, obtain vibration signal.
The present embodiment signal processing apparatus, by photodetector receive return light converge with reference light to be formed be mixed do
Light is related to, analog electrical signal is converted into.It is sampled by the analog electrical signal that analog to digital conversion circuit 11 obtains photodetector, into
Row analog-to-digital conversion exports the first signal.
Optical frequency shifter 10 exports local oscillation signal, and local oscillation signal is frequency-shift signaling.Analog-to-digital conversion module 11 is to optical frequency shifter 10
The local oscillation signal of output is sampled, and is carried out analog-to-digital conversion and is exported second signal.
First processing circuit 12 is inputted by the two paths of signals that analog-to-digital conversion module 11 exports, carries out related algorithm fortune
It calculates, demodulates the vibration signal of characterization target surface vibration.
The present embodiment signal processing circuit uses digital demodulation mode, compared with existing use analog demodulation circuit, to mixed
The demodulation process precision of frequency interference light is higher, is influenced by environmental factor small, and reliability is higher.
The present embodiment signal processing circuit is described further below.The present embodiment signal processing circuit includes light shift frequency
Device 10, analog-to-digital conversion module 11 and the first processing circuit 12.
The present embodiment signal processing circuit, by photodetector receive return light converge with reference light to be formed be mixed do
Light is related to, mixing interference signal is converted to.
Preferably, balanced detector can be used in photodetector, is more advantageous to detection small-signal, can reduce noise.Show
Example property, THORLABS PDB570C balanced detector can be used, detection light wave segment limit is 1200-1700nm, work electricity
Pressure is direct current, frequency acquisition 400MHz.
The analog-to-digital conversion module 11 is connected with photodetector, acquires the mould that mixing interference light obtains to photodetector
Quasi- signal carries out analog-to-digital conversion, exports the first signal.
Optionally, high-speed ADC capture card can be used in analog-digital conversion circuit as described 11, and ADC capture card can be with binary channels
12bits, 250MHz sample signal, can meet aromatic sampling thheorem, guarantee undistorted sampling.
The optical frequency shifter 10 is used to export local oscillation signal, and acousto-optic frequency shifters specifically can be used, in a kind of concrete application,
The centre frequency of the acousto-optic frequency shifters is 40MHz.
It is connected with amplifier between photodetector and the analog-to-digital conversion module 11, in optical frequency shifter 10 and the mould
Amplifier is connected between number conversion module 11, amplifier is for amplifying processing to signal.
The two paths of signals exported by analog-to-digital conversion module 11 inputs the first processing circuit 12 respectively, the first processing electricity
Road 12 includes power splitter 120, the first computing module 121, phase shifter 122, low-pass filter 123 and the second computing module 124.
Wherein, the first signal is divided into two-way by power splitter 120, inputs first computing module 121 respectively.
Referring to FIG. 2, first processing circuit 12 further includes being connected to the power splitter 120 to input in the present embodiment
The first bandpass filter 125 hold, that bandpass filtering treatment is carried out for the first signal to input.
It is connected with relay amplifier 126 between first bandpass filter 125 and the power splitter 120, being used for will
Signal is amplified to equal with second signal amplitude.The first signal exported by analog-to-digital conversion module 11, by the first bandpass filtering
After device 125 carries out bandpass filtering treatment, input relay amplifier carries out intermediate amplification, makes the amplitude of this signal and second signal
Unanimously, power splitter 120 is then inputted.
Second signal is divided into two-way by power splitter 120, wherein signal directly inputs the first computing module 121 all the way, with
The signal all the way that one signal is divided into carries out multiplication operation, is mixed；It is defeated after shifted 122 phase shift of the device processing of another way signal
Enter the first computing module 121, carries out multiplication operation with the another way signal of the first signal, be mixed.Wherein phase shifter 122 is used
In by signal carry out 90 degree of phase shifts.
The two paths of signals exported by the first computing module 121 includes the sum of fundamental frequencies ingredient and difference frequency after mixing per signal all the way
Ingredient, two paths of signals input low-pass filter 123 respectively and are filtered, and low-pass filter filters radio-frequency component, retain
Low frequency signal.Two-way baseband signal I baseband signal and Q baseband are exported by low-pass filter.Illustratively, a kind of specific
The cutoff frequency of low-pass filter is 50kHz in.
Two-way baseband signal inputs the second computing module 124 respectively, and the second computing module 124 carries out two-way baseband signal
Be divided by, arctangent cp cp operation processing and phase unwrapping processing, restore vibration signal.
Target, which makes a sound, to generate vibration in target surface, can be with by measuring the vibration signal of target surface vibration
The voice signal of target generation is further restored, and then the measurement for issuing voice signal to target may be implemented.Based on this, originally
Embodiment signal processing circuit can also be achieved the voice signal of measurement target.
Specifically, on the basis of above-described embodiment content, the present embodiment signal processing circuit further includes and described first
The second processing circuit that processing circuit 12 connects, the vibration signal for being exported according to first processing circuit 12 restore language
Sound signal.
Specifically, the second processing circuit includes:
Sampling circuit, for being sampled to the vibration signal of input；
Second bandpass filter, for carrying out the filtering in voice frequency range to signal；
Speech processor, for going out voice signal according to signals revivification.
The vibration signal that second processing circuit exports the first processing circuit is sampled, with 1/ in a kind of concrete application
2000 are sampled, and then carry out bandpass filtering, and design filter bandwidht is 300-3000Hz, carry out speech frequency model to signal
Interior filtering is enclosed, restores voice signal finally by speech processor.
Second processing circuit described in the present embodiment is also used to that the voice signal that reduction obtains is stored and exported.Specifically
, the second processing circuit further includes the loudspeaker for playing voice signal.Second processing circuit can be connected by USB interface
Host computer is connect to store voice signal.
In the present embodiment signal processing circuit, the first processing circuit 12 can be used programmable gate array, and described second
Processing circuit uses digital signal processing chip.
Therefore, the digital vibration signal that the present embodiment signal processing circuit realizes laser coherence vibration measuring system restores,
And the reduction of voice signal.
A kind of signal processing circuit provided by the present invention is described in detail above.It is used herein specifically a
Principle and implementation of the present invention are described for example, and it is of the invention that the above embodiments are only used to help understand
Method and its core concept.It should be pointed out that for those skilled in the art, not departing from the principle of the invention
Under the premise of, it can be with several improvements and modifications are made to the present invention, these improvement and modification also fall into the claims in the present invention
Protection scope in.
Claims (10)
1. a kind of signal processing circuit, which is characterized in that including optical frequency shifter, analog-to-digital conversion module and the first processing circuit；
The analog-to-digital conversion module is connected with photodetector, the optical frequency shifter respectively, for adopting the photodetector
The analog signal that collection mixing interference light obtains carries out analog-to-digital conversion and exports the first signal, and the local oscillator that the optical frequency shifter is exported is believed
Number carry out analog-to-digital conversion export second signal；
First processing circuit includes power splitter, the first computing module, phase shifter, low-pass filter and the second computing module；
The two paths of signals exported by the analog-to-digital conversion module inputs two power splitters respectively, is entered first signal
The power splitter first signal is divided into two-way, input first computing module respectively；
The second signal is divided into two-way by the power splitter for being entered the second signal, wherein all the way described in signal input
First computing module carries out multiplication operation with the signal all the way of first signal, and another way signal is through the phase shifter phase shift
First computing module is inputted after processing, carries out multiplication operation with the another way signal of first signal；
Two-way baseband signal is obtained after low-pass filter processing by the two paths of signals of first computing module output, it is defeated
Enter to second computing module to be divided by and arctangent cp cp operation is handled, obtains vibration signal.
2. signal processing circuit according to claim 1, which is characterized in that first processing circuit further includes being connected to
Be entered the power splitter input terminal of first signal, for carrying out bandpass filtering treatment to the first signal of input
First bandpass filter.
3. signal processing circuit according to claim 2, which is characterized in that in first bandpass filter and the function
Divide between device and is connected with relay amplifier, it is equal with the second signal amplitude for may amplify the signal to.
4. signal processing circuit according to claim 1, which is characterized in that the phase shifter is used to signal carrying out 90 degree
Phase shift.
5. signal processing circuit according to claim 1, which is characterized in that turn in the photodetector and the modulus
The amplifier for amplifying to signal is connected between mold changing block；
The amplifier for amplifying to signal is connected between the optical frequency shifter and the analog-to-digital conversion module.
6. signal processing circuit according to claim 1-5, which is characterized in that further include and first processing
The second processing circuit of circuit connection, the vibration signal for being exported according to first processing circuit restore voice signal.
7. signal processing circuit according to claim 6, which is characterized in that the second processing circuit includes:
Sampling circuit, for being sampled to the vibration signal of input；
Second bandpass filter, for carrying out the filtering in voice frequency range to signal；
Speech processor, for going out voice signal according to signals revivification.
8. signal processing circuit according to claim 6, which is characterized in that the second processing circuit is also used to reduction
Obtained voice signal is stored and is exported.
9. signal processing circuit according to claim 8, which is characterized in that the second processing circuit further includes for broadcasting
Put the loudspeaker of voice signal.
10. signal processing circuit according to claim 6, which is characterized in that first processing circuit is using programmable
Logic gate array, the second processing circuit use digital signal processing chip.
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| CN201611248378.9A CN106603163B (en) | 2016-12-29 | 2016-12-29 | A kind of signal processing circuit |
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| CN201611248378.9A CN106603163B (en) | 2016-12-29 | 2016-12-29 | A kind of signal processing circuit |
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| CN106603163A CN106603163A (en) | 2017-04-26 |
| CN106603163B true CN106603163B (en) | 2019-04-16 |
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| CN111366232A (en) * | 2020-04-08 | 2020-07-03 | 中国科学院长春光学精密机械与物理研究所 | All-fiber pulse laser Doppler vibrometer and signal processing method thereof |
| CN113193876B (en) * | 2021-04-14 | 2022-07-01 | 中国人民解放军陆军工程大学 | Zero intermediate frequency receiving device and method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104964735A (en) * | 2015-07-06 | 2015-10-07 | 江苏安智光电科技有限公司 | Laser phase generated carrier doppler vibration signal detection system and demodulation method |
| CN105577280A (en) * | 2015-12-15 | 2016-05-11 | 中国电子科技集团公司第三十八研究所 | Optical carrier microwave signal dynamic wideband real-time digital demodulation system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8787708B2 (en) * | 2011-08-15 | 2014-07-22 | Alcatel Lucent | Endless phase shifting |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104964735A (en) * | 2015-07-06 | 2015-10-07 | 江苏安智光电科技有限公司 | Laser phase generated carrier doppler vibration signal detection system and demodulation method |
| CN105577280A (en) * | 2015-12-15 | 2016-05-11 | 中国电子科技集团公司第三十八研究所 | Optical carrier microwave signal dynamic wideband real-time digital demodulation system |
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