A pose optimization method for structured light detection of off-axis aspheric surfaces

A technology of off-axis aspheric surface and optimization method, which is applied in the field of pose optimization of off-axis aspheric surface detection by structured light, can solve the problems of high detection cost and low sampling density, and achieves high sensitivity, loose position requirements, and large dynamic range. Effect

Active Publication Date: 2020-04-10
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0003] At present, there are mainly two methods for surface shape detection of off-axis aspheric surfaces: coordinate measurement and interferometry. The former is point-by-point measurement based on coordinates, and the sampling density is relatively small. The latter has higher detection accuracy, but for off-axis aspheric Processing compensator, the detection cost is high

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  • A pose optimization method for structured light detection of off-axis aspheric surfaces
  • A pose optimization method for structured light detection of off-axis aspheric surfaces
  • A pose optimization method for structured light detection of off-axis aspheric surfaces

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] figure 1 It is a schematic diagram of the structure of the device used by the structured light detection off-axis aspheric pose optimization method of the present invention. The utilized device includes an LCD display screen 1 , a measured mirror surface 2 and a camera 3 . Combined with an example, the measurement process is as follows:

[0027] The first step is to make at least three marking points on the LCD display screen 1, the measured mirror surface 2 and the camera 3 respectively, and use a laser tracker to measure and obtain the spatial coordinate position information of each marking point;

[0028] In the second step, the horizontal and vertical sinusoidal stripes are respectively displayed on the LCD display 1, such as figure 2 and image 3 Shown, and use the camera 3 to shoot the fringes reflected by the measured specula...

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Abstract

The invention discloses a position and posture optimization method for detecting an off-axis aspheric surface by structured-light. The method comprises the steps that stripes are projected on a detected mirror surface through a displayer, a slope of each point of the detected mirror surface is calculated by using deformation information of the projected stripes after mirror reflection, and then surface form information of the detected mirror surface is obtained by integration. A structured-light measuring method is simple in principle structure, a detection dynamic range is larger, and the structured-light measuring method is widely used in the surface form detection field. But in the actual measurement process, position and posture errors of the mirror surface can strongly affect final surface form detection precision, especially low frequency surface forms are affected, the position and posture optimization method for detecting the off-axis aspheric surface by the structured light can effectively solves the problem through a numerical optimization algorithm, the structured-light surface form detection precision is improved, and important application value is achieved.

Description

technical field [0001] The invention belongs to the technical field of optical measurement, and in particular relates to a pose optimization method for structured light detection of an off-axis aspheric surface. Background technique [0002] With the continuous development of modern optical technology, aspheric optical elements have been more and more widely used in modern optical systems, because the application of aspheric optical elements can make the system miniaturized, simplified and lightweight, especially off-axis Aspherical. In optical system design, compared with flat spherical surfaces, aspheric surfaces have more degrees of freedom in design, and can simultaneously optimize the radius of curvature of the vertex, quadric surface constants, and higher-order coefficients, which is more conducive to controlling the imaging quality of the optical system. Due to its many advantages, the optical system with aspheric surface as the core has a very wide range of applicat...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/25
CPCG01B11/25G01B11/254
Inventor 赵文川宋伟红
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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