CN106603163A - Signal processing circuit - Google Patents
Signal processing circuit Download PDFInfo
- Publication number
- CN106603163A CN106603163A CN201611248378.9A CN201611248378A CN106603163A CN 106603163 A CN106603163 A CN 106603163A CN 201611248378 A CN201611248378 A CN 201611248378A CN 106603163 A CN106603163 A CN 106603163A
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- China
- Prior art keywords
- signal
- processing circuit
- analog
- digital conversion
- signal processing
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Classifications
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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
-
- 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
Abstract
The invention discloses a signal processing circuit which comprises an optical frequency shifter, an analog-to-digital conversion module and a first processing circuit. The analog-to-digital conversion module is connected with a photodetector and the optical frequency shifter and is used for performing analog-to-digital conversion on an analog signal which is obtained through acquiring mixing interference light by the photodetector for outputting a first signal, and performing analog-to-digital conversion on a local oscillator signal that is output from the photodetector. The first processing circuit comprises a power divider, a first computation module, a phase shifter, a lowpass filter and a second computation module. The first processing circuit performs related algorithm computation on two signals and performs demodulation for obtaining a vibration signal which represents surface vibration of an object. The signal processing circuit utilizes a digital demodulation manner. Compared with an existing analog demodulation circuit, the signal processing circuit has advantages of higher demodulation precision of the mixing interference light, lower influence by environment factors, and higher reliability.
Description
Technical field
The present invention relates to signal processing circuit technical field, more particularly to a kind of signal processing circuit.
Background technology
In laser coherence micro-vibration detection system, optical system sends 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 is converged with reference light,
The vibration signal that characterizes target surface vibration can be demodulated according to the mixing interference light to be formed is converged, realization is shaken to target surface
Dynamic detection.
In prior art, it is using analog demodulator side to being mixed interference light and carrying out processing the processing mode for obtaining vibration signal
Formula, but analog demodulation circuit haves the shortcomings that demodulation accuracy is low, easily affected by environmental factorss such as temperature etc..
The content of the invention
It is an object of the invention to provide a kind of signal processing circuit, using digital demodulation mode, the solution to being mixed interference light
Tune processing accuracy is higher, and reliability is higher.
For achieving the above object, the present invention provides following technical scheme：
A kind of signal processing circuit, including optical frequency shifter, analog-to-digital conversion module and the first process circuit；
The analog-to-digital conversion module is connected with photodetector, the optical frequency shifter respectively, for by the photodetection
The analogue signal that device collection mixing interference light is obtained carries out analog digital conversion and exports the first signal, the sheet that the optical frequency shifter is exported
The signal that shakes carries out analog digital conversion output secondary signal；
First process circuit includes power splitter, the first computing module, phase shifter, low pass filter and the second computing mould
Block；
The power splitter is input into respectively by the two paths of signals that the analog-to-digital conversion module is exported, the power splitter is by described
One signal is divided into two-way, is input into first computing module respectively；
The secondary signal is divided into two-way by the power splitter, wherein the first computing module described in signal input all the way, with
The signal all the way of first signal carries out multiplication operation, and another road signal is input into described the described in after phase shifter phase shift is processed
One computing module, carries out multiplication operation with another road signal of first signal；
Two-way base band letter is obtained described in after low pass filter is processed by the two paths of signals of first computing module output
Number, it is input to second computing module and is divided by and arctangent cp cp operation process, obtains vibration signal.
Alternatively, first process circuit also include being connected to the power splitter input, for the to input
One signal carries out the first band filter of bandpass filtering treatment.
Alternatively, intermediate amplifier is connected between first band filter and the power splitter, for believing
Number it is amplified to equal with the secondary signal amplitude.
Alternatively, the phase shifter is for carrying out 90 degree of phase shifts by signal.
Alternatively, it is connected with for being amplified to signal between the photodetector and the analog-to-digital conversion module
Amplifier；
The amplifier for being amplified to signal is connected between the optical frequency shifter and the analog-to-digital conversion module.
Alternatively, also include the second processing circuit being connected with first process circuit, for according at described first
The vibration signal of reason circuit output restores voice signal.
Alternatively, the second processing circuit includes：
Sampling circuit, for be input into vibration signal be sampled；
Second band filter, for the filtering in voice frequency range is carried out to signal；
Speech processor, for going out voice signal according to signals revivification.
Alternatively, the second processing circuit is additionally operable to the voice signal that reduction is obtained is stored and exported.
Alternatively, the second processing circuit is also included for playing the speaker of voice signal.
Alternatively, first process circuit adopts programmable gate array, and the second processing circuit is using numeral
Signal processing chip.
As shown from the above technical solution, signal processing circuit provided by the present invention, including optical frequency shifter, analog digital conversion mould
Block and the first process circuit, the first process circuit include power splitter, the first computing module, phase shifter, low pass filter and second
Computing module.
The analogue signal that photodetector gathers mixing interference light acquisition is carried out analog digital conversion output by analog-to-digital conversion module
The local oscillation signal that optical frequency shifter is exported is carried out analog digital conversion output secondary signal by the first signal；Two paths of signals distinguishes input work
Divide device, the power splitter that the first signal is divided into two-way, the first computing module is input into respectively；Secondary signal is divided by the power splitter
Into two-way, wherein the first computing module of signal input all the way, carries out multiplication operation with the signal all the way that the first signal is divided into, it is another
Signal shifted device phase shift in road is input into the first computing module after processing, and carries out multiplication operation with another road signal of the first signal.
Two-way baseband signal is obtained after being processed by the low-pass filtered device of two paths of signals that the first computing module is exported, is input to
Second computing module is divided by and arctangent cp cp operation is processed, and obtains vibration signal.
Compared with prior art, signal processing circuit of the present invention adopts digital demodulation mode, the demodulation to being mixed interference light
Processing accuracy is higher, is affected little by environmental factorss, and reliability is higher.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of schematic diagram of signal processing circuit provided in an embodiment of the present invention；
A kind of schematic diagram of signal processing circuit that Fig. 2 is provided for further embodiment of this invention.
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 is converged the mixing interference light to be formed and is processed and demodulated with reference light, is obtained with reducing
Characterize the vibration signal of target surface vibration.
Refer to Fig. 1, a kind of signal processing circuit provided in an embodiment of the present invention, including optical frequency shifter 10, analog digital conversion
Module 11 and the first process circuit 12；
The analog-to-digital conversion module 11 is connected with photodetector, the optical frequency shifter 10 respectively, for by the photoelectricity
The analogue signal that detector collection mixing interference light is obtained carries out analog digital conversion and exports the first signal, will be the optical frequency shifter 10 defeated
The local oscillation signal for going out carries out analog digital conversion output secondary signal；
First process 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 input into respectively by the two paths of signals that the analog-to-digital conversion module 11 is exported
First signal is divided into into two-way, first computing module 121 is input into respectively；
The secondary signal is divided into two-way by the power splitter 120, wherein the first computing module described in signal input all the way
121, multiplication operation is carried out with the signal all the way of first signal, after 122 phase shift of the phase shifter process described in of another road signal
First computing module 121 is input into, and multiplication operation is carried out with another road signal of first signal；
Two-way is obtained after low pass filter 123 is processed by the two paths of signals that first computing module 121 is exported described in
Baseband signal, is input to second computing module 124 and is divided by and arctangent cp cp operation process, obtain vibration signal.
The present embodiment signal processing apparatus, receive return light by photodetector and reference light converge the mixing to be formed and does
Light is related to, analog electrical signal is converted into.The analog electrical signal that photodetector is obtained is sampled by analog to digital conversion circuit 11, enter
Row analog 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 carries out analog digital conversion output secondary signal.
First process circuit 12 is input into by the two paths of signals that analog-to-digital conversion module 11 is exported, related algorithm fortune is carried out
Calculate, demodulate the vibration signal for characterizing target surface vibration.
The present embodiment signal processing circuit adopts digital demodulation mode, compared with existing employing analog demodulation circuit, to mixed
The demodulation process precision of frequency interference light is higher, is affected little by environmental factorss, and reliability is higher.
Below the present embodiment signal processing circuit is described further.The present embodiment signal processing circuit includes light shift frequency
Device 10, analog-to-digital conversion module 11 and the first process circuit 12.
The present embodiment signal processing circuit, receives return light by photodetector and reference light converges the mixing to be formed and does
Light is related to, mixing interference signal is converted to.
Preferably, photodetector can adopt balanced detector, be more beneficial for detecting small-signal, it is possible to decrease noise.Show
Example property, THORLABS PDB570C balanced detectors can be adopted, its detection light wave segment limit is 1200-1700nm, and work electricity
Press as direct current, frequency acquisition 400MHz.
The analog-to-digital conversion module 11 is connected with photodetector, and the mould that mixing interference light is obtained is gathered to photodetector
Intending signal carries out analog digital conversion, exports the first signal.
Optionally, analog-digital conversion circuit as described 11 can adopt high-speed ADC capture card, and ADC capture cards can be with the dual pathways
12bits, 250MHz sample to signal, can meet aromatic sampling thheorem, it is ensured that undistorted sampling.
The optical frequency shifter 10 is used to export local oscillation signal, can specifically adopt acousto-optic frequency shifters, in a kind of concrete application,
The mid frequency of the acousto-optic frequency shifters is 40MHz.
Amplifier is connected between photodetector and the analog-to-digital conversion module 11, in optical frequency shifter 10 and the mould
Amplifier is connected between number modular converters 11, amplifier for being amplified process to signal.
First process circuit 12 is input into respectively by the two paths of signals that analog-to-digital conversion module 11 is exported, described first processes 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, is input into first computing module 121 respectively.
Fig. 2 is refer to, in the present embodiment, first process circuit 12 also includes that being connected to the power splitter 120 is input into
The first band filter 125 hold, that bandpass filtering treatment is carried out for the first signal to being input into.
Intermediate amplifier 126 is connected between first band filter 125 and the power splitter 120, for inciting somebody to action
Signal is amplified to equal with secondary signal amplitude.The first signal exported by analog-to-digital conversion module 11, through the first bandpass filtering
After device 125 carries out bandpass filtering treatment, the intermediate amplifier of input carries out intermediate amplification, makes the amplitude of this signal and secondary signal
Unanimously, then it is input into power splitter 120.
Secondary 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 after shifted 122 phase shift of device of another road signal is processed, defeated
Enter the first computing module 121, multiplication operation is carried out with another road signal of the first signal, be mixed.The wherein phase shifter 122 is used
In signal is carried out 90 degree of phase shifts.
The two paths of signals exported by the first computing module 121, per signal packet all the way containing the sum of fundamental frequencies composition and difference frequency after mixing
Composition, two paths of signals are input into low pass filter 123 respectively and are filtered process, and radio-frequency component is filtered by low pass filter, retain
Low frequency signal.Two-way baseband signal I baseband signal and Q baseband are exported by low pass filter.Exemplary, a kind of concrete
Using in, the cut-off frequency of low pass filter is 50kHz.
Two-way baseband signal is input into the second computing module 124 respectively, and the second computing module 124 is carried out to two-way baseband signal
It is divided by, arctangent cp cp operation process and phase unwrapping are processed, and restore vibration signal.
Target sends sound and can produce vibration in target surface, by the vibration signal for measuring target surface vibration, can be with
The voice signal of target generation is further restored, and then can realize sending target the measurement of voice signal.Based on this, this
Embodiment signal processing circuit is also capable of achieving the voice signal of measurement target.
Specifically, on the basis of above-described embodiment content, the present embodiment signal processing circuit also includes and described first
The second processing circuit of the connection of process circuit 12, the vibration signal for being exported according to first process circuit 12 restore language
Message number.
Specifically, the second processing circuit includes：
Sampling circuit, for be input into vibration signal be sampled；
Second band filter, for the filtering in voice frequency range is carried out to signal；
Speech processor, for going out voice signal according to signals revivification.
Second processing circuit is sampled to the vibration signal that the first process circuit is exported, with 1/ in a kind of concrete application
2000 are sampled, and then carry out bandpass filtering, and design filter bandwidht is 300-3000Hz, carries out speech frequency model to signal
Filtering in enclosing, restores voice signal finally by speech processor.
Second processing circuit described in the present embodiment is additionally operable to the voice signal that reduction is obtained is stored and exported.Specifically
, the second processing circuit is also included for playing the speaker of voice signal.Second processing circuit can be connected by USB interface
Connect host computer to store voice signal.
In the present embodiment signal processing circuit, the first process circuit 12 can adopt programmable gate array, described second
Process circuit adopts digital signal processing chip.
Therefore, the present embodiment signal processing circuit realizes the digital vibration signal recovery of laser coherence vibration measuring system,
And the reduction of voice signal.
Above a kind of signal processing circuit provided by the present invention is described in detail.It is used herein specifically individual
Example is set forth to the principle and embodiment of the present invention, and the explanation of above example is only intended to help understand the present invention's
Method and its core concept.It should be pointed out that for those skilled in the art, without departing from the principle of the invention
On the premise of, some improvement and modification can also be carried out to the present invention, these improve and modification also falls into the claims in the present invention
Protection domain in.
Claims (10)
1. a kind of signal processing circuit, it is characterised in that including optical frequency shifter, analog-to-digital conversion module and the first process circuit；
The analog-to-digital conversion module is connected with photodetector, the optical frequency shifter respectively, for the photodetector is adopted
The analogue signal that collection mixing interference light is obtained carries out analog digital conversion and exports the first signal, the local oscillator letter that the optical frequency shifter is exported
Number carry out analog digital conversion output secondary signal；
First process circuit includes power splitter, the first computing module, phase shifter, low pass filter and the second computing module；
The power splitter is input into respectively by the two paths of signals that the analog-to-digital conversion module is exported, the power splitter is believed described first
Number it is divided into two-way, is input into first computing module respectively；
The secondary signal is divided into two-way by the power splitter, wherein the first computing module described in signal input all the way, and described
The signal all the way of the first signal carries out multiplication operation, and another road signal is input into first fortune described in after phase shifter phase shift is processed
Module is calculated, and multiplication operation is carried out with another road signal of first signal；
Two-way baseband signal is obtained after low pass filter is processed by the two paths of signals of first computing module output described in, it is defeated
Enter to second computing module to be divided by and arctangent cp cp operation is processed, obtain vibration signal.
2. signal processing circuit according to claim 1, it is characterised in that first process circuit also includes being connected to
The power splitter input, carry out the first band filter of bandpass filtering treatment for the first signal to being input into.
3. signal processing circuit according to claim 2, it is characterised in that in first band filter and the work(
Divide intermediate amplifier is connected between device, it is equal with the secondary signal amplitude for may amplify the signal to.
4. signal processing circuit according to claim 1, it is characterised in that the phase shifter is for carrying out 90 degree by signal
Phase shift.
5. signal processing circuit according to claim 1, it is characterised in that turn in the photodetector and the modulus
The amplifier for being amplified to signal is connected between mold changing block；
The amplifier for being amplified to signal is connected between the optical frequency shifter and the analog-to-digital conversion module.
6. the signal processing circuit according to any one of claim 1-5, it is characterised in that also include and described first is processed
The second processing circuit of circuit connection, the vibration signal for being exported according to first process circuit restore voice signal.
7. signal processing circuit according to claim 6, it is characterised in that the second processing circuit includes：
Sampling circuit, for be input into vibration signal be sampled；
Second band filter, for the filtering in voice frequency range is carried out to signal；
Speech processor, for going out voice signal according to signals revivification.
8. signal processing circuit according to claim 6, it is characterised in that the second processing circuit is additionally operable to reduction
The voice signal for obtaining is stored and is exported.
9. signal processing circuit according to claim 8, it is characterised in that the second processing circuit is also included for broadcasting
Put the speaker of voice signal.
10. signal processing circuit according to claim 6, it is characterised in that first process circuit is using programmable
Logic gate array, the second processing circuit adopt digital signal processing chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611248378.9A CN106603163B (en) | 2016-12-29 | 2016-12-29 | A kind of signal processing circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611248378.9A CN106603163B (en) | 2016-12-29 | 2016-12-29 | A kind of signal processing circuit |
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| CN106603163A true CN106603163A (en) | 2017-04-26 |
| CN106603163B CN106603163B (en) | 2019-04-16 |
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| CN201611248378.9A Active CN106603163B (en) | 2016-12-29 | 2016-12-29 | A kind of signal processing circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN113193876A (en) * | 2021-04-14 | 2021-07-30 | 中国人民解放军陆军工程大学 | Zero intermediate frequency receiving device and method |
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| US20130044974A1 (en) * | 2011-08-15 | 2013-02-21 | Alcatel-Lucent Usa Inc. | Endless phase shifting |
| 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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2016
- 2016-12-29 CN CN201611248378.9A patent/CN106603163B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130044974A1 (en) * | 2011-08-15 | 2013-02-21 | Alcatel-Lucent Usa Inc. | Endless phase shifting |
| 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN113193876A (en) * | 2021-04-14 | 2021-07-30 | 中国人民解放军陆军工程大学 | Zero intermediate frequency receiving device and method |
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| Publication number | Publication date |
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| CN106603163B (en) | 2019-04-16 |
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