CN109100026A - The device and method for inhibiting decoherence in heterodyne detection based on CCD camera - Google Patents
The device and method for inhibiting decoherence in heterodyne detection based on CCD camera Download PDFInfo
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- G01J9/00—Measuring optical phase difference; Determining degree of coherence; Measuring optical wavelength
Abstract
The device and method for inhibiting decoherence in heterodyne detection based on CCD camera that the invention discloses a kind of, wherein device includes: laser, the first beam splitting chip, local oscillator optical path acousto-optic frequency shifters, signal optical path acousto-optic frequency shifters, the second beam splitting chip, optical antenna, reflecting mirror, third beam splitting chip, CCD camera, image-signal processing system and signal-to-noise ratio feedback system；Intermediate frequency heterodyne signal frequency is down between CCD camera detectable regions by two frequency shifters, the phase difference between different pixel optical heterodyne signals is identified by image processing techniques, and according to the adjusting offset picture signal output sequence, so that each pixel output signal in-phase stacking output, simultaneously, heterodyne signal output sequence can be readjusted according to heterodyne signal signal-to-noise ratio and optical heterodyne Signal-to-Noise is recalculated according to heterodyne signal output sequence adjusted, until the optical heterodyne Signal-to-Noise of output is greater than or equal to threshold value, hence it is evident that improve heterodyne detection signal-to-noise ratio.
Description
Technical field
The present invention relates to heterodyne detection of laser technical field, more particularly to a kind of inhibition based on CCD camera
The device and method of decoherence in heterodyne detection.
Background technique
Heterodyne detection of laser has lot of advantages, but the performance of the technology is but by the restriction of various factors.Wherein,
(party's text is good to wait the coarse decoherence to synthetic aperture laser radar echo of target to imitate in a Research Literatures announced in 2013
It answers [J] Acta Physica Sinica .62 (2): 024204), discussing since the coarse caused decoherence of target surface causes heterodyne to be visited
The phenomenon that surveying signal-to-noise ratio decline.Decoherence can be described as the mismatch of signal light Yu local oscillator light light field, and this light
The phenomenon that mismatch be target surface it is coarse caused by.Target rough surface to the modulating action of signal echo wavefront such as
Shown in Figure of description 1, Fig. 2, Fig. 3.Fig. 1 is light source emerging wavefront, this it appears that the wavefront is very smooth from figure；Figure
2 be reflecting mirror echo-signal wavefront, it can be seen that is not had significant change before signal light-wave via the reflection of mirror surface, wavefront is still
It is very smooth；Fig. 3 is rough surface signal optical echo wavefront, it can be seen that rough surface is bright to the modulating action before signal light-wave
Aobvious, signal light-wave front-distortion is serious.In heterodyne detection process, before the coarse signal light-wave that will lead to of target surface with local oscillator light
Wavefront wavefront severe mismatch eventually leads to heterodyne detection signal-to-noise ratio and is decreased obviously.Therefore, decoherence caused by target surface is coarse
Effect remains the key problem for hindering the development of active heterodyne detection technology.
(David Fink and Samuel N.Vodopia, " Coherent in a Research Literatures announced in 1976
Detection SNR of an array of detectors, " Appl.Opt.15,453-454 (1976)) it proposes and proves
A possibility that simple detector in detector array replacement optical path is to improve optical heterodyne detection signal-to-noise ratio can be used.If will
The output of each detection member, which is pressed, in array determines ratio enlargement, and additional determining phase pushing figure can greatly improve light
Heterodyne detection signal-to-noise ratio, but it is not specified how determine magnification ratio and phase pushing figure in the document, and also do not have
Illustrate how phase calibration offset.
A kind of patent document " light field matching heterodyne detection dress based on detector array of the University of Electronic Science and Technology in its application
Set and method " in (publication number: CN 104568174A, application number: 201510002065.4, applying date: on 01 04th, 2015)
A kind of light field matching heterodyne detection device and method based on detector array is disclosed, which is received by detector array
Then optical signal calculates detector cells received signal amplification coefficient and phase by the opening and closing of photoswitch in control optical path
Position offset, and addition is weighted to detector cells received signal, to reach the mesh for improving heterodyne detection signal-to-noise ratio
's.Shortcoming existing for this method is: firstly, structure is complicated, not easy of integration for the array detection device proposed in the invention, and
The invention system needs that programmable amplifier is added in each array element rear end of detector array, so that system cost is high, therefore should
Inventive method practices difficulty with biggish；Secondly, the system carries out a large amount of division arithmetics using single-chip microprocessor MCU module, use
MCU module, which carries out division arithmetic, will introduce extra error, and difference detects first accumulation of error and finally leads the stability for the system that reduces
Cause signal-to-noise ratio improvement effect unobvious.
Therefore, the problem of heterodyne detection signal-to-noise ratio is always those skilled in the art's urgent need to resolve how is improved.
Summary of the invention
In view of this, what the present invention provides a kind of based on CCD camera inhibits the device of decoherence in heterodyne detection
And method passes through image processing techniques between intermediate frequency heterodyne signal frequency is down to CCD camera detectable regions by two frequency shifters
The phase difference between different pixel optical heterodyne signals is identified, and according to the adjusting offset picture signal output sequence, so that respectively
Pixel output signal in-phase stacking output, meanwhile, it is capable to constantly recalculate and adjust heterodyne letter according to heterodyne signal signal-to-noise ratio
Number output sequence, until the optical heterodyne Signal-to-Noise of output is greater than or equal to threshold value, hence it is evident that improve heterodyne detection signal-to-noise ratio.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of device for inhibiting decoherence in heterodyne detection based on CCD camera, comprising: laser, the first beam splitting
Piece, local oscillator optical path acousto-optic frequency shifters, signal optical path acousto-optic frequency shifters, the second beam splitting chip, optical antenna, reflecting mirror, third beam splitting
Piece, CCD camera, image-signal processing system and signal-to-noise ratio feedback system；
The laser beam that the laser generates is divided into local beam and signal beams, local oscillator light through first beam splitting chip
Beam and signal beams carry out shift frequency by the local oscillator optical path acousto-optic frequency shifters and the signal optical path acousto-optic frequency shifters respectively, obtain
To local oscillator shift frequency light beam and signal shift frequency light beam；
Wherein, the signal shift frequency light beam is irradiated at target by second beam splitting chip and the optical antenna, from
The signal shift frequency light beam that target surface returns successively leads to after the optical antenna, second beam splitting chip and the reflecting mirror
It crosses the third beam splitting chip and the local oscillator shift frequency light beam closes beam；
The CCD camera will carry out mixing by the signal shift frequency light beam and local oscillator shift frequency light beam of conjunction beam and generate outside intermediate frequency light
Difference signal, described image signal processing system identify the phase difference between the CCD camera difference pixel optical heterodyne signal, and according to
The adjusting offset picture signal output sequence so that each pixel output signal in-phase stacking exports, and calculates optical heterodyne letter
Number signal-to-noise ratio；
The signal-to-noise ratio feedback system compares the optical heterodyne Signal-to-Noise with pre-set snr threshold
Compared with then exporting the superposed signal if more than snr threshold；If being less than snr threshold, optical heterodyne Signal-to-Noise is fed back
To image-signal processing system, described image signal processing system constantly adjust heterodyne signal output sequence and according to adjustment after
Heterodyne signal output sequence recalculate optical heterodyne Signal-to-Noise, until output optical heterodyne Signal-to-Noise be greater than or wait
In threshold value.
A method of decoherence in the inhibition heterodyne detection based on CCD camera, comprising:
Step 1: building the device described in claim 1 that inhibit decoherence in heterodyne detection based on CCD camera；
Step 2: opening laser and signal light field is radiated on detection Rough Target, make by adjusting third beam splitting chip
The signal beams returned through target surface are obtained successively to lead to after the optical antenna, second beam splitting chip and the reflecting mirror
It crosses the third beam splitting chip and the local oscillator shift frequency light beam closes beam, and impinge perpendicularly on CCD camera surface；
Signal beams and local oscillator shift frequency light beam are carried out mixing and generate intermediate frequency optical heterodyne signal, image by step 3:CCD camera
Signal processing system identifies the phase difference between the CCD camera difference pixel optical heterodyne signal；
Step 4: image-signal processing system is according to the adjusting offset picture signal output sequence, so that each pixel is defeated
Signal in-phase stacking exports out, and calculates optical heterodyne Signal-to-Noise；
Step 5: the signal-to-noise ratio feedback system is by the optical heterodyne Signal-to-Noise and pre-set snr threshold
It is compared, the superposed signal is then exported if more than snr threshold；If being less than snr threshold, by optical heterodyne signal noise
Than feeding back to image-signal processing system, described image signal processing system constantly adjust heterodyne signal output sequence and according to
Heterodyne signal output sequence adjusted recalculates optical heterodyne Signal-to-Noise until the optical heterodyne Signal-to-Noise of output is big
In or equal to threshold value.
It can be seen via above technical scheme that compared with prior art, the present disclosure provides one kind to be based on CCD camera
Inhibit heterodyne detection in decoherence device and method, have following technical advantage:
1, the present invention belongs to array detection mechanism using high-speed CCD camera as optical heterodyne signal receiving device.Compared to
Simple detector Heterodyne Detection System greatly improves optical heterodyne detection signal-to-noise ratio.
2, CCD camera is as signal receiving unit in the present invention, CCD camera technology maturation, and commercial CCD camera has been furnished with
Whole signal acquiring system, makes that system structure is simple, device cost is low, has preferable practical application value.
3, the present invention uses CCD camera as heterodyne detection device, calculates and adjust different pictures by image processing means
First output sequence, and it is based on signal-to-noise ratio feedback system Real-time Feedback signal-tonoise information, greatly improve signal-to-noise ratio improvement
And system stability.
4, single-chip microprocessor MCU module is not used in the present invention in different array element signals phase difference identification process largely to be removed
Method operation is eliminated the extra error introduced in existing scheme due to MCU module division arithmetic, improves system stability, noise
It is very more significant than improvement effect.
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
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 attached drawing is laser light source wavefront schematic diagram；
Fig. 2 attached drawing is reflecting mirror echo-signal wavefront schematic diagram；
Fig. 3 attached drawing is rough surface echo-signal wavefront schematic diagram；
Fig. 4 attached drawing is the schematic diagram of the Heterodyne Detection System based on CCD camera；
Fig. 5 attached drawing is the schematic diagram for adjusting CCD camera output sequence；
Wherein, Fig. 5 (a) is the schematic diagram of CCD camera output sequence before adjusting；Fig. 5 (b) is CCD camera output after adjustment
The schematic diagram of sequence.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to attached drawing 4 and attached drawing 5, moved back in the embodiment of the invention discloses a kind of inhibition heterodyne detection based on CCD camera
The device of coherent effect, comprising: laser 11, the first beam splitting chip 12, local oscillator optical path acousto-optic frequency shifters 13, signal optical path acousto-optic move
Frequency device 14, the second beam splitting chip 21, optical antenna 22, reflecting mirror 23, third beam splitting chip 24, CCD camera 31, image signal process system
System 32 and signal-to-noise ratio feedback system 4；
The laser beam that laser 11 generates divides through the first beam splitting chip 12 for local beam and signal beams, local beam and
Signal beams pass through local oscillator optical path acousto-optic frequency shifters 13 respectively and signal optical path acousto-optic frequency shifters 14 carry out shift frequency, obtain local oscillator shifting
Frequency light beam and signal shift frequency light beam；
Wherein, signal shift frequency light beam is irradiated at target by the second beam splitting chip 21 and optical antenna 22, from target surface
The signal shift frequency light beam of return successively passes through third beam splitting chip 24 after optical antenna 22, the second beam splitting chip 21 and reflecting mirror 23
Beam is closed with local oscillator shift frequency light beam；
CCD camera 31 will carry out mixing by the signal shift frequency light beam and local oscillator shift frequency light beam of conjunction beam and generate intermediate frequency optical heterodyne
Signal, image-signal processing system 32 identify the phase difference between CCD camera difference pixel optical heterodyne signal, and according to phase difference tune
Whole picture signal output sequence so that each pixel output signal in-phase stacking exports, and calculates optical heterodyne Signal-to-Noise；
Optical heterodyne Signal-to-Noise is compared by signal-to-noise ratio feedback system 4 with pre-set snr threshold, if greatly
The superposed signal is then exported in snr threshold；If being less than snr threshold, optical heterodyne Signal-to-Noise is fed back into image
Signal processing system 32, image-signal processing system 32 constantly adjust heterodyne signal output sequence and according to heterodynes adjusted
Signal output sequence recalculates optical heterodyne Signal-to-Noise, until the optical heterodyne Signal-to-Noise of output is greater than or equal to threshold
Value.
Between intermediate frequency heterodyne signal frequency is down to CCD camera detectable regions by two frequency shifters by the present invention, pass through image
Processing technique identifies the phase difference between different pixel optical heterodyne signals, and according to adjusting offset picture signal output sequence, makes
Each pixel output signal in-phase stacking output is obtained, meanwhile, it is capable to constantly recalculate and adjust according to heterodyne signal signal-to-noise ratio and is outer
Difference signal output sequence significantly improves heterodyne detection letter until the optical heterodyne Signal-to-Noise of output is greater than or equal to threshold value
It makes an uproar ratio.
Decoherence in heterodyne detection is inhibited based on CCD camera in addition, the embodiment of the invention also discloses a kind of
Method, comprising:
Step 1: the device that inhibits in heterodyne detection decoherence of the building based on CCD camera；
Step 2: opening laser and signal light field is radiated on detection Rough Target, make by adjusting third beam splitting chip
The signal beams returned through target surface are obtained successively after optical antenna, the second beam splitting chip and reflecting mirror through third beam splitting chip
Beam is closed with local oscillator shift frequency light beam, and impinges perpendicularly on CCD camera surface；
Signal beams and local oscillator shift frequency light beam are carried out mixing and generate intermediate frequency optical heterodyne signal, image by step 3:CCD camera
Signal processing system identifies the phase difference between CCD camera difference pixel optical heterodyne signal；
Step 4: image-signal processing system is according to adjusting offset picture signal output sequence, so that each pixel output letter
The output of number in-phase stacking, and calculate optical heterodyne Signal-to-Noise；
Step 5: optical heterodyne Signal-to-Noise is compared by signal-to-noise ratio feedback system with pre-set snr threshold,
The superposed signal is then exported if more than snr threshold；If being less than snr threshold, optical heterodyne Signal-to-Noise is fed back to
Image-signal processing system, described image signal processing system constantly adjust heterodyne signal output sequence and according to adjusted
Heterodyne signal output sequence recalculates optical heterodyne Signal-to-Noise.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (2)
1. a kind of device for inhibiting decoherence in heterodyne detection based on CCD camera characterized by comprising laser,
First beam splitting chip, local oscillator optical path acousto-optic frequency shifters, signal optical path acousto-optic frequency shifters, the second beam splitting chip, optical antenna, reflecting mirror,
Third beam splitting chip, CCD camera, image-signal processing system and signal-to-noise ratio feedback system；
The laser beam that the laser generates is divided into local beam and signal beams through first beam splitting chip, local beam and
Signal beams carry out shift frequency by the local oscillator optical path acousto-optic frequency shifters and the signal optical path acousto-optic frequency shifters respectively, obtain this
Shake shift frequency light beam and signal shift frequency light beam；
Wherein, the signal shift frequency light beam is irradiated at target by second beam splitting chip and the optical antenna, from target
The signal shift frequency light beam that surface returns successively passes through institute after the optical antenna, second beam splitting chip and the reflecting mirror
It states third beam splitting chip and the local oscillator shift frequency light beam closes beam；
The CCD camera will carry out mixing by the signal shift frequency light beam and local oscillator shift frequency light beam of conjunction beam and generate intermediate frequency optical heterodyne letter
Number, described image signal processing system identifies the phase difference between the CCD camera difference pixel optical heterodyne signal, and according to described
Adjusting offset picture signal output sequence so that each pixel output signal in-phase stacking exports, and calculates optical heterodyne signal letter
It makes an uproar ratio；
The optical heterodyne Signal-to-Noise is compared by the signal-to-noise ratio feedback system with pre-set snr threshold, if
The superposed signal is then exported greater than snr threshold；If being less than snr threshold, optical heterodyne Signal-to-Noise is fed back into figure
As signal processing system, described image signal processing system constantly adjusts heterodyne signal output sequence and according to adjusted outer
Difference signal output sequence recalculates optical heterodyne Signal-to-Noise, until the optical heterodyne Signal-to-Noise of output is greater than or equal to threshold
Value.
2. a kind of method for inhibiting decoherence in heterodyne detection based on CCD camera characterized by comprising
Step 1: building the device described in claim 1 that inhibit decoherence in heterodyne detection based on CCD camera；
Step 2: open laser make signal light field be radiated at detection Rough Target on, by adjusting third beam splitting chip make through
The signal beams that target surface returns successively pass through institute after the optical antenna, second beam splitting chip and the reflecting mirror
It states third beam splitting chip and the local oscillator shift frequency light beam closes beam, and impinge perpendicularly on CCD camera surface；
Signal beams and local oscillator shift frequency light beam are carried out mixing and generate intermediate frequency optical heterodyne signal, picture signal by step 3:CCD camera
Processing system identifies the phase difference between CCD camera difference pixel optical heterodyne signal；
Step 4: image-signal processing system is according to the adjusting offset picture signal output sequence, so that each pixel output letter
The output of number in-phase stacking, and calculate optical heterodyne Signal-to-Noise；
Step 5: the signal-to-noise ratio feedback system carries out the optical heterodyne Signal-to-Noise and pre-set snr threshold
Compare, the superposed signal is then exported if more than snr threshold；It is if being less than snr threshold, optical heterodyne Signal-to-Noise is anti-
It is fed to image-signal processing system, described image signal processing system constantly adjusts heterodyne signal output sequence and according to adjustment
Heterodyne signal output sequence afterwards recalculates optical heterodyne Signal-to-Noise, until output optical heterodyne Signal-to-Noise be greater than or
Equal to threshold value.
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Cited By (5)
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| CN110109139A (en) * | 2019-05-16 | 2019-08-09 | 电子科技大学 | A kind of high-resolution imaging system and method based on heterodyne detection of laser |
| CN110967777A (en) * | 2019-12-23 | 2020-04-07 | 宁波飞芯电子科技有限公司 | Coherent detection receiving apparatus, coherent de-correlation processing method, device, and medium |
| CN112305550A (en) * | 2019-08-01 | 2021-02-02 | 宁波飞芯电子科技有限公司 | Coherent detection device and method |
| CN112752129A (en) * | 2019-10-31 | 2021-05-04 | 西安诺瓦星云科技股份有限公司 | Video source synchronous output method, device, system and computer readable storage medium |
| CN113050101A (en) * | 2019-12-26 | 2021-06-29 | 宁波飞芯电子科技有限公司 | Coherent signal receiving device, method and coherent detection system |
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