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Surface shape tolerance analysis method for free-form surface imaging system

A surface error and surface technology, which is applied in the field of surface tolerance analysis of free-form surface imaging systems, can solve problems such as the difficulty of surface processing without considering the surface shape, and achieve the effect of flexible use and accurate surface shape.

Active Publication Date: 2020-01-17
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

Although this method considers the randomness of the surface shape error, the randomly generated Zernike coefficient determines that the constructed surface shape error is also completely random, and does not take into account the influence of the actual surface shape processing difficulty

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  • Surface shape tolerance analysis method for free-form surface imaging system
  • Surface shape tolerance analysis method for free-form surface imaging system
  • Surface shape tolerance analysis method for free-form surface imaging system

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Embodiment Construction

[0051] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0052] The present invention provides a surface tolerance analysis method for a free-form surface imaging system, which is used to analyze the surface tolerance of a free-form surface in an optical imaging system. The process of the method is as follows: figure 1 shown, including the following steps:

[0053] S1. Set the maximum acceptable tolerance value.

[0054] S2. Divide a uniform mesh on the surface to be analyzed. After that, it also includes: obtaining the coordinate value and gradient modulus value of the grid point on the surface to be analyzed;

[0055] The coordinate value of the grid point takes the horizontal and vertical directions of the uniform grid as the x and y coordinate axes respectively. The origin can be randomly selected in the uniform grid, for example, a grid point in the lower left corner can be selected as the origin.

[...

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Abstract

The invention discloses a surface shape tolerance analysis method for a free-form surface imaging system. The method is used for carrying out surface shape tolerance analysis on a free-form surface inan optical imaging system. The method comprises the following steps: giving a maximum acceptable tolerance value; dividing a uniform grid on the to-be-analyzed curved surface, and obtaining a centralposition, a standard deviation and a weight coefficient of the Gaussian basis function; calculating current surface shape error distribution according to the generated Gaussian basis function group,linearly scaling the current surface shape error distribution, and taking the scaled surface shape error distribution as an actual curved surface shape error distribution matrix; obtaining a set number of actual curved surface shape error distribution matrixes, selecting a proper image quality evaluation index, performing Monte Carlo analysis according to the surface shape error, obtaining predicted values of image quality evaluation indexes under different cumulative probability values, selecting the predicted values of the image quality evaluation indexes under the set cumulative probabilityas analysis quantities according to requirements, and analyzing the analysis quantities to determine whether the given maximum acceptable tolerance value is reasonable or not.

Description

technical field [0001] The invention relates to the technical field of optical design, in particular to a surface tolerance analysis method of a free-form surface imaging system. Background technique [0002] Tolerance analysis is an important part of the overall optical design process. On the one hand, because the imaging system has higher requirements on the accuracy of the free-form surface, there will always be certain errors in the optical system due to the precision limitations of the processing technology and assembly technology during the processing, resulting in the imaging quality of the physical system being lower than the design expectations. , there is even a possibility that the actual system cannot meet the usage requirements. Tolerance analysis can predict the actual performance of the physical system after processing and assembly, which is very meaningful for imaging systems. On the other hand, tolerance analysis can guide the fabrication and assembly of p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/00
CPCG02B27/0012
Inventor 杨通倪俊豪程德文王涌天
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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