CN-121252636-B - Shearing quantity self-adaptive regulation and control method and system for shearing speckle interferometry

CN121252636BCN 121252636 BCN121252636 BCN 121252636BCN-121252636-B

Abstract

The invention provides a shearing quantity self-adaptive regulation and control method and a system for shearing speckle interferometry, which relate to the technical field of speckle interferometry and comprise the following steps of according to the optical transfer function of a shearing device The method comprises the steps of determining the threshold range of the number of transition points of the shearing interference fringes according to the number of the phase difference transition points on the 1-level fringe order in the phase difference distribution diagram of the shearing device, realizing automatic quantitative analysis and judgment of fringe density information in the shearing interference phase difference distribution diagram, further guiding self-adaptive adjustment of shearing quantity in the strain measurement process, solving the problem of reduced strain measurement precision caused by improper selection of shearing quantity parameters in the existing laser shearing speckle interferometry technology, and simultaneously realizing automatic, efficient and accurate regulation of the shearing quantity without manual intervention in the whole regulation process.

Inventors

JIANG HONGZHEN
BA RONGSHENG
CHAI LIQUN
Zhou xinda
LI JIE
SHI ZHENDONG
LI ZHENGHAO

Assignees

中国工程物理研究院激光聚变研究中心

Dates

Publication Date: 20260512
Application Date: 20251029

Claims (8)

1. A shearing quantity self-adaptive regulation and control method for shearing speckle interferometry is characterized by comprising the following steps of according to the optical transfer function of a shearing device Determining the threshold range of the number of transition points of the shearing interference fringes by the number and the phase difference transition points on the 1-level fringe order in the phase difference distribution diagram of the shearing device; Wherein, the Number = focal length f/pupil diameter D; Collecting and measuring a required shearing speckle interference pattern, inputting the shearing speckle interference pattern into a shearing device, reading a shearing interference phase difference filtering distribution diagram of the shearing speckle interference pattern obtained by measurement of the shearing device under the initial shearing quantity setting condition, and scanning the phase filtering diagram row by row and column by column along the vertical and parallel directions respectively at fixed pixel intervals to obtain a phase distribution curve corresponding to each scanned row and each scanned column straight line; calculating the differential value of adjacent data points in the phase curve, and obtaining occurrence in the phase curve Data points of phase transitions, and counting the number of transition points of each phase distribution curve; Finding out the phase distribution curve with the largest number of transition points, and recording the phase distribution curve as the maximum value of the number of transition points; Comparing the obtained maximum value of the number of the transition points with an initial set threshold range of the number of the transition points of the shearing interference fringes, and multiplying the shearing quantity if the maximum value of the number of the transition points is lower than the lower limit of the threshold range; repeating the steps until the maximum value of the number of the transition points is positioned in the threshold range, stopping self-adaptive regulation and control of the shearing quantity, obtaining the shearing quantity in the corresponding threshold range, and taking the obtained corresponding shearing quantity as the shearing quantity of shearing speckle interferometry.
2. The method of claim 1, wherein the lower limit of the threshold range is a maximum number of phase transition points in the phase difference distribution map where the fringe order is 1.
3. The method for adaptively adjusting and controlling the shearing quantity of shearing speckle interferometry according to claim 1, wherein the upper limit of the threshold range is set to be equal to the upper limit of the optical transfer function The numbers are adapted and their values are inversely proportional to the values in the optical transfer function A number.
4. A method for adaptively adjusting and controlling shearing quantity of shearing speckle interferometry according to claim 3, wherein the method is characterized in that the method is used for obtaining different values through numerical simulation or experimental verification And the highest stripe grade accurately recorded by the numerical shearing device is further determined, and the maximum value of the number of transition points of the highest stripe grade is used as the upper limit of the threshold.
5. A method of adaptively adjusting and controlling the amount of shear measured by shearing speckle interferometry as set forth in claim 1, wherein said shearing speckle interferometry is acquired by a detector.
6. A shearing quantity adaptive control system for shearing speckle interferometry, for executing the method for controlling shearing quantity according to any one of claims 1 to 5, characterized in that the shearing quantity adaptive control system comprises: the numerical value setting module is used for setting a threshold range of the number of transition points of the shearing interference fringes; the image acquisition module is used for acquiring a shearing speckle interference pattern; the differential value calculation module is used for calculating differential values of adjacent data points in the phase curves and counting the number of transition points of each phase distribution curve; And the comparison module is used for comparing the maximum value of the number of the obtained transition points with the threshold range of the number of the transition points of the shearing interference fringes, which is set in the beginning, and judging whether to adjust the current shearing quantity.
7. A computer-readable storage medium storing a computer program for adaptive regulation of a shearing amount, wherein the computer program causes a computer to execute the method for regulating a shearing amount according to any one of claims 1 to 5.
8. An electronic device, comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the programs comprising instructions for performing the shear volume adaptive modulation method according to any one of claims 1-5.

Description

Shearing quantity self-adaptive regulation and control method and system for shearing speckle interferometry Technical Field The invention relates to the technical field of speckle interferometry, in particular to a shearing quantity self-adaptive regulation and control method and system for shearing speckle interferometry. Background Shearing speckle interference is an optical measurement technique based on the laser speckle phenomenon and interference principle. It is mainly used for measuring displacement derivatives of the surface of an object, such as the first derivative (slope) of the out-of-plane displacement. When coherent light (such as laser) irradiates on a rough surface, scattered light interferes with each other in space to form a random intensity distribution pattern due to microscopic irregularity of the surface, and after the object light field passes through an optical shearing device, the speckle pattern on the surface of the object generates certain displacement in the transverse direction, namely transverse shearing, and the original object light field and the sheared object light field interfere on an imaging plane, namely shearing speckle interference. In the measuring process, if the shearing quantity of the shearing device is unreasonably arranged, the accuracy of a strain measuring result can be affected, at present, a commonly adopted shearing quantity regulating and controlling method is that in the measuring process, visual qualitative observation is carried out on a shearing interference phase difference distribution diagram obtained under a certain shearing quantity, if the phenomena of over-dense stripes, low signal to noise ratio and the like exist in the shearing quantity, the shearing quantity is reduced to improve the measuring accuracy of the phase change quantity, and if the phenomena of over-sparse stripes exist in the shearing quantity (only zero-order stripes exist in a full view field), the shearing quantity is increased to improve the calibrating accuracy of the shearing quantity. And repeating the process until the phenomenon is visually judged to be absent in the shearing interference phase difference distribution diagram, so as to ensure the strain measurement precision. However, the shearing quantity is regulated and controlled by adopting a visual qualitative observation method, manual intervention is needed in the process, the regulation and control result is greatly influenced by human subjective factors, accurate quantitative analysis cannot be performed on the fringe density information in the shearing interference phase difference distribution diagram, further reasonable regulation of the shearing quantity cannot be effectively guided to improve the precision of the strain measurement result, and the proper shearing quantity can be obtained by adopting the visual qualitative observation method to regulate and control the shearing quantity usually by manually carrying out repeated regulation for a plurality of times, so that the regulation and control process is time-consuming and tedious, and automation, high efficiency and accurate regulation and control of the shearing quantity cannot be realized. Disclosure of Invention (One) solving the technical problems Aiming at the defects of the prior art, the invention provides a shearing quantity self-adaptive regulation and control method and a shearing quantity self-adaptive regulation and control system for shearing speckle interferometry, which solve the technical problem that in the prior art, a visual qualitative observation method is difficult to guide reasonable regulation of shearing quantity so as to improve the accuracy of a strain measurement result. (II) technical scheme In order to achieve the above purpose, the invention is realized by the following technical scheme: In a first aspect, the present invention provides a method for adaptively adjusting and controlling the shearing quantity of a shearing speckle interferometry, comprising the steps of, based on the optical transfer function of a shearing device Determining the threshold range of the number of transition points of the shearing interference fringes by the number and the phase difference transition points on the 1-level fringe order in the phase difference distribution diagram of the shearing device; Wherein, the Number = focal length f/pupil diameter D; Collecting and measuring a required shearing speckle interference pattern, inputting the shearing speckle interference pattern into a shearing device, reading a shearing interference phase difference filtering distribution diagram of the shearing speckle interference pattern obtained by measurement of the shearing device under the initial shearing quantity setting condition, and scanning the phase filtering diagram row by row and column by column along the vertical and parallel directions respectively at fixed pixel intervals to obtain a phase distribution curve corresponding to each s