Mirror surface object three-dimensional shape measurement method and system based on concave mirror auxiliary imaging
A technology of three-dimensional shape and measurement method, which is applied in the direction of measuring devices, instruments, and optical devices, etc., can solve the problems that stripes and the mirror surface under test cannot be clearly imaged at the same time, and affect the accuracy of three-dimensional measurement, so as to achieve a wide range of applications and easy adjustment , to avoid the effect of error accumulation
Active Publication Date: 2022-01-07
HEBEI UNIV OF TECH
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Problems solved by technology
Due to the influence of the limited depth of field of the camera lens in the existing method, the virtual image formed by the fringe pattern displayed on the LCD screen after being reflected by the mirror object to be tested is located outside the depth of field of the camera, so that the stripes on the LCD screen and the mirror surface to be tested cannot be clear at the same time Imaging, which seriously affects the accuracy of 3D measurement
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[0064] In this embodiment, the numbers of the three groups of sinusoidal straight stripes selected for projection are 49, 48 and 42, respectively.
[0065]The measurement method of the present invention is based on the reflection imaging principle of the concave mirror 3 and the fringe reflection method. According to the imaging principle of the concave mirror 3, after the fringe image displayed by the liquid crystal display 4 is reflected by the concave mirror 3, it will form a fringe image containing the same fringe information at a position symmetrical to the liquid crystal display 4 by the concave mirror 3 axis; The basic principle of the reflection method, the fringe pattern on the liquid crystal display 4 is reflected by the concave mirror 3 and then reflected by the mirror object 7 to be measured, and the CCD camera 2 collects the deformed fringe pattern reflected by the mirror object 7 to be measured; demodulation, calculate and obtain the unfolded phase; and then reco...
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The invention discloses a mirror surface object three-dimensional shape measurement method and system based on concave mirror auxiliary imaging. The system comprises a computer, a CCD camera, a concave mirror, a liquid crystal display screen and a first high-precision horizontal movement guide rail. In the method, according to a concave mirror imaging principle, a fringe image displayed by the liquid crystal display screen is reflected by a concave mirror, then according to a fringe reflection principle, the fringe image on the liquid crystal display screen is reflected by the concave mirror, an image of the fringe image reflected by the concave mirror is reflected by a mirror surface object to be measured, and a CCD camera collects a deformed fringe image reflected by the mirror surface object to be measured, the fringe information is demodulated, and calculating is conducted to obtain an unwrapped phase; and the three-dimensional shape data of the surface of the mirror surface object to be measured is recovered through the mapping relation between the phase and the depth, so that the problem of inaccurate phase acquisition caused by a defocus phenomenon due to the limitation of the depth of field of the camera in a traditional measurement system is solved, and the measurement precision is high.
Description
technical field [0001] The invention relates to the field of optical non-contact three-dimensional shape measurement of mirror objects, in particular to a method and system for measuring three-dimensional shape of mirror objects with concave mirror-assisted imaging. Background technique [0002] With the development of industrial manufacturing, there are a large number of mirror components in aerospace, automobile industry, artificial intelligence and other fields. Accurately obtaining the three-dimensional topography of the surface is of great significance to improve the performance of components. However, due to the reflection characteristics of mirror objects, the reflected light is completely limited by the normal of the object surface, and the camera cannot be placed arbitrarily to observe the three-dimensional shape of mirror objects. Therefore, the accurate acquisition of 3D topography data on the surface of specular objects has always been a research hotspot and diff...
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IPC IPC(8): G01B11/25
CPCG01B11/254
Inventor 张宗华李梓瑜高楠孟召宗
Owner HEBEI UNIV OF TECH