CN105866939A - Method for introducing wavefront distortion on basis of micro deformation mirror - Google Patents
Method for introducing wavefront distortion on basis of micro deformation mirror Download PDFInfo
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- CN105866939A CN105866939A CN201610424164.6A CN201610424164A CN105866939A CN 105866939 A CN105866939 A CN 105866939A CN 201610424164 A CN201610424164 A CN 201610424164A CN 105866939 A CN105866939 A CN 105866939A
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- wavefront
- deformable mirror
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/06—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the phase of light
Abstract
The invention relates to a method for introducing wavefront distortion on the basis of a micro deformation mirror. According to the method, the control on the wave surface of optical waves is realized through a micro deformation mirror control system; the required distortion is introduced. According to the method, a wavefront sensor, a micro deformation mirror and a host computer are used for forming a closed loop control system. The micro deformation mirror is used for shaping optical waves; an HS wavefront sensor receives the shaped optical waves, and then transmits a sub aperture array image into a computer; the wavefront inclination vector is obtained through image gravity-center displacement calculation; the wavefront phase Zernike polynomial coefficient is obtained; the differences from the target wavefront are detected, and the SPGD (stochastic parallel gradient descent) algorithm is used for regulating the control voltage of the micro deformation mirror. The method provided by the invention has the advantages that certain optical path placing flexibility can be realized; the control is performed through a computer software platform; the advantages of high efficiency and convenient debugging and development are realized; the important use values are realized in the practical application process.
Description
Technical field
Patent of the present invention relates to the introducing of wavefront distortion, and a kind of introducing wavefront based on micro deformable mirror is abnormal
Darkening closed loop control method.In conjunction with wavefront measurement and the means of computer programming closed loop control, control micro-change
Shape mirror surface-shaped changes, the wavefront distortion emulation that atmospheric optics effect is caused by convenient, flexible realization.
Background technology
When light wave is propagated in an atmosphere, owing to turbulent flow, shock wave, Aerodynamic Heating cause current density change, composition
Change, variations in temperature etc., cause the deformation of the change at random of air refraction, optical window, cause corrugated
Amplitude and phase place quick random fluctuation change, thus to optical imagery detection interfere, make target figure
As offseting, shake, obscuring, cause atmospheric optics effect.Visit in modern ground, Space Optical System
Surveying imaging field, research step is the model emulation space optics effect of theory analysis, modeling and simulating, miniaturization
The test answered and final imaging detection system exploitation etc..The ripple of atmospheric optics effect and generation thereof is differed
Carry out emulating, simulating, can preferably complete research and the improvement of optical system imaging detection, it is to avoid consume
Substantial amounts of fund.Therefore, emulation is it is critical that link.
The simulation means of atmospheric optics effect not yet has systematized way, the simultaneously simulation of air complex flowfield
There is high accuracy, the requirement of high real-time, therefore in research, there is certain difficulty.Based on this, this
A kind of method of bright proposition, i.e. utilizes micro deformable mirror to emulate space optics effect, by micro deformable mirror
Control break reflector type so that light wave wavefront produces specific wavefront distortion accordingly.
Modern micro deformable mirror development increasingly achieves strict requirements: bandwidth of operation is high, natural resonance frequency
Height, wavefront correction dynamic range, unbalance are little, miniaturization and resisting fatigue, low-voltage, low energy consumption,
High actuating unit density.Therefore adaptive optics field it is commonly used in, as wavefront correction device correction wavefront by mistake
Difference is to obtain good image quality.The purpose of the inventive method application micro deformable mirror in contrast, is essence
Really introduce wavefront distortion.
For accurately controlling Light deformation mirror type, the present invention uses stochastic parallel gradient descent (SPGD) algorithm
Closed-loop control system, control variable is micro deformable mirror electrode voltage.SPGD algorithm is a kind of special gradient
Descent algorithm, applies random disturbance to all of control variable simultaneously, is effectively improved gradient estimated accuracy, holds concurrently
Has efficient feature.
Summary of the invention
It is an object of the invention to the emulation for realizing aero-optical effect, and propose a kind of based on micro deformable mirror
The method introducing wavefront distortion, can be provided with at aspects such as optical effect analysis, simulation study optical imageries
The help of effect.
A kind of method introducing wavefront distortion based on micro deformable mirror, it is characterised in that by micro deformable mirror control
System realizes the control to light wave corrugated, introduces required distortion.The method utilizes Wavefront sensor, Light deformation
Mirror and host computer composition closed-loop control system.By micro deformable mirror, wavefront is controlled, and utilizes wavefront to pass
Wavefront surface type is detected by sensor, then compares the difference before the wavefront information and object wave detected, builds
Vertical object function, controls the change of Light deformation mirror type in combination with random paralleling gradient descent algorithm (SPGD),
Introducing wavefront is finally made to reach unanimity with target distorted wavefront.
The method of described introducing wavefront distortion based on micro deformable mirror, is placed on light beam phase by micro deformable mirror
In the light path joined, light wave corrugated is carried out shaping；
The method of described introducing wavefront distortion based on micro deformable mirror, utilizes Shack-Hartmann (HS) wavefront
Wavefront after described shaping is detected by sensor；
The method of described introducing wavefront distortion based on micro deformable mirror, controls described detection figure by computer
The acquisition process of picture also obtains CCD sub-aperture pattern matrix；
The method of described introducing wavefront distortion based on micro deformable mirror, utilizes Zernike polynomial repressentation and divides
Analysis wavefront, calculates the center of gravity deviation of described sub-aperture pattern matrix, it is thus achieved that the wavefront slope information of detection light wave,
Obtain further detecting wavefront phase information φ；
The method of described introducing wavefront distortion based on micro deformable mirror, calculates described detection wavefront φ and reference
φ before object wave0Phase difference φ, set up object function J, i.e. the ripple to object wave front-distortion with detection wavefront
The quantitative description of face difference；
The method of described introducing wavefront distortion based on micro deformable mirror, uses SPGD closed loop control algorithm,
According to the phase contrast real-time Correction and Control voltage before described detection wavefront and object wave so that it is along object function ladder
Degree inverse change；
The method of described introducing wavefront distortion based on micro deformable mirror, it is defeated that computer produces control voltage signal
Entering to the D/A conversion unit being connected, amplified device is input to distorting lens actuator after amplifying, drive minute surface
Alteration of form；
The method of described introducing wavefront distortion based on micro deformable mirror, closed loop control finally makes described corrugated poor
Different Δ φ meets the threshold requirement of setting, thus realizes the accurate introducing of object wave front-distortion.
Beneficial effect
The present invention has following distinguishing feature and a good effect:
1. master system use many algorithms instrument carry out computing, use suitable image acquisition and processing and
Micro deformable mirror closed loop control algorithm, real-time is good, efficiency is higher, and is easy to test, debugs and open with secondary
Send out.
2. use conventional equipment to realize, the convenient and flexible installation of light path simultaneously.
Accompanying drawing explanation
Fig. 1 is the present invention structural representation introducing wavefront distortion method based on micro deformable mirror.
Fig. 2 is the closed loop algorithm program flow diagram of the inventive method.
Detailed description of the invention
Below in conjunction with the accompanying drawing of the present invention, the present invention is further illustrated, but this should not limit this
Bright protection domain.
As it is shown in figure 1, the present invention method introducing wavefront distortion based on micro deformable mirror, utilize light source, micro-
Distorting lens and control system (D/A conversion unit, amplifier), HS Wavefront sensor, computer control mould
Block composition closed-loop control system.After utilizing HS Wavefront sensor to obtain skiodrome picture, complete in master system
Become the comparison of difference and the generation of micro deformable mirror control signal before the calculating of Wave-front phase, detection and object wave,
Distoring mirror type is driven to change and the adjustment of wavefront.
As in figure 2 it is shown, present invention wavefront distortion based on micro deformable mirror introducing method, closed loop algorithm program flow
Journey is as follows:
The first step, after initialization, preset distorting lens voltage；
Second step, high frequency control process each during, computer controls to gather and also reads in Wavefront sensor
The sub-aperture pattern matrix of detection；
3rd step, calculates the centroid motion of this pattern matrix, obtains the polynomial wavefront slope of unit Zernike
Vector G；
4th step, uses type method to restore wavefront, Wave-front phase Zernike approximation by polynomi-als:
φ (x, y)=a0+∑akZk(x, y)+ε (k=1,2 ..., n)
The partial derivative of wavefront slope Zernike function represents, matrix represents
Remembering into G=DA+ ε, wherein ε is measurement error, and m is sub-aperture number of samples, and n is pattern exponent number.With
The generalized inverse matrix D of D+The polynomial least square solution of Zernike is sought, i.e. with described wavefront slope vector G
Wavefront phase information Zernike system of polynomials number vector:
A=D+G
5th step, calculates objective appraisal function J；
6th step, compares the difference of φ 0 before detection wavefront φ and object wave；
7th step, it is judged that whether above-mentioned difference meets threshold condition, if meeting threshold condition, shuts down procedure；
If being unsatisfactory for threshold condition, use SPGD algorithm, according to the Wave-front phase difference Correction and Control in real time of detection
Voltage so that it is along objective appraisal function J gradient inverse change, have:
ui (k+1)=ui (k)-uδJ(k)δui (k)
Wherein, u is for controlling voltage quantities, and k is iterations；
Although with reference to exemplary embodiment describing the present invention, it is to be understood that, term used be explanation and
Exemplary and nonrestrictive term.Owing to the present invention can be embodied as in a variety of forms without deviating from sending out
Bright spirit or essence, it should therefore be appreciated that above-described embodiment is not limited to any aforesaid details, and should be
Explain widely in the spirit and scope that appended claims are limited, therefore fall into claim or its equivalence
In the range of whole changes and remodeling all should be appended claims and contained.
Claims (8)
1. the method introducing wavefront distortion based on micro deformable mirror, it is characterised in that realize the control to light wave corrugated by micro deformable mirror control system, introduces required distortion.The method utilizes Wavefront sensor, micro deformable mirror and host computer composition closed-loop control system.By micro deformable mirror, wavefront is controlled, and utilize Wavefront sensor that wavefront surface type is detected, then the difference before the wavefront information and object wave detected is compared, set up object function, control the change of Light deformation mirror type in combination with parallel gradient descent algorithm (SPGD), finally make introducing wavefront reach unanimity with target distorted wavefront.
2. the method for a kind of based on micro deformable mirror the introducing wavefront distortion described in claim 1, it is characterised in that micro deformable mirror is placed in the light path of beam which matches, light wave corrugated is carried out shaping.
3. the method for a kind of based on micro deformable mirror the introducing wavefront distortion described in claim 1, it is characterised in that utilize Shack-Hartmann (HS) Wavefront sensor that the wavefront after described shaping is detected.
4. the method for a kind of based on micro deformable mirror the introducing wavefront distortion described in claim 1, it is characterised in that control the acquisition process of described detection image by PC and obtain CCD sub-aperture pattern matrix.
5. the method for a kind of based on micro deformable mirror the introducing wavefront distortion described in claim 1, it is characterized in that utilizing Zernike polynomial repressentation and analyzing wavefront, calculate the center of gravity deviation of described sub-aperture pattern matrix, obtain the wavefront slope information of detection light wave, obtain further detecting wavefront phase information φ.
6. the method for a kind of based on micro deformable mirror the introducing wavefront distortion described in claim 1, it is characterised in that calculate phase difference φ of described detection wavefront φ and reference target wavefront φ 0, set up performance evaluation object function J, to corrugated difference quantitative description.
7. the method for a kind of based on micro deformable mirror the introducing wavefront distortion described in claim 1, it is characterised in that use SPGD closed loop control algorithm, according to described detection Wave-front phase difference Correction and Control voltage in real time so that it is along target function gradient inverse change.
8. the method for a kind of based on micro deformable mirror the introducing wavefront distortion described in claim 1, it is characterized in that computer produces and control the D/A conversion unit that voltage signal is input to be connected, amplified device is input to distorting lens actuator and drives mirror shape to change after amplifying；
A) method of a kind of based on micro deformable mirror the introducing wavefront distortion described in claim 1, it is characterised in that closed loop control finally makes described corrugated discrepancy delta φ meet the threshold requirement of setting, thus realizes the accurate introducing of object wave front-distortion.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108982411A (en) * | 2018-07-09 | 2018-12-11 | 安徽建筑大学 | The laser in-situ detection system of ammonia concentration in a kind of detection flue |
| CN114721145A (en) * | 2022-01-20 | 2022-07-08 | 苏州科技大学 | Method for improving horizontal laser communication SPGD algorithm correction precision |
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Application publication date: 20160817 |