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Off-axis aspheric lens detection method based on fringe reflection

An off-axis aspheric surface and detection method technology, which is applied in the field of advanced optical manufacturing and detection, can solve problems such as inability to obtain quantitative results, and achieve the effects of large dynamic measurement range, high sensitivity, and suppression of influence

Active Publication Date: 2012-06-13
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

Knife-edge detection relies on the experience of the inspector, which is a qualitative detection and cannot obtain quantitative results
It is generally considered to use a three-coordinate measuring machine, but for the detection of off-axis aspheric surfaces, since it is not a rotationally symmetrical surface, how to achieve accurate calibration and calibration of the coordinate system of the measured object is a difficult problem

Method used

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  • Off-axis aspheric lens detection method based on fringe reflection
  • Off-axis aspheric lens detection method based on fringe reflection
  • Off-axis aspheric lens detection method based on fringe reflection

Examples

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Embodiment Construction

[0025] like figure 1 As shown, the measurement system consists of an off-axis aspheric mirror, a display screen and a CCD camera, such as figure 1 As shown, the implementation steps are as follows:

[0026] First, translate and rotate the mother mirror coordinate system to establish an off-axis non-plane world coordinate system. Generally, the equation of a symmetric quadratic aspheric mother mirror can be expressed as:

[0027] z ′ = c ( x ′ 2 + y ′ 2 ) 1 + 1 - ( k + ...

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Abstract

An off-axis aspheric lens detection method based on fringe reflection includes: firstly, building a world coordinate system around the center of an off-axis aspheric lens and acquiring the relation among the world coordinate system, a display coordinate system and a camera coordinate system; secondly, utilizing the camera to take pictures of projections, reflected from a measured lens, of sine periodic fringe patterns displayed on a display screen during measuring; and thirdly, obtaining phase distribution according to the phase shift technology and the phase unwrapping technology, obtaining normal vector distribution of the measured off-axis aspheric lens according to the relation among the coordinates; and finally, rebuilding surface form height information of the measured off-axis aspheric lens in an integral manner. In addition, a measuring system utilizing the off-axis aspheric lens detection method based on fringe reflection consists of the measured lens, the display screen and a CCD (charged coupled device) camera unit.

Description

technical field [0001] The invention relates to an optical detection technology, in particular to an off-axis aspheric mirror detection method based on fringe reflection, which belongs to the field of advanced optical manufacturing and detection technology. Background technique [0002] Under the premise of ensuring the image quality, the use of aspheric elements can reduce the complexity, size and weight of the optical system. Especially for large-aperture space remote sensors, the use of aspheric elements is particularly important. At present, with the improvement of civilian resource survey and national defense and military requirements, the space camera is required to have a larger field of view and higher resolution. The new generation of space cameras generally uses lightweight and large-sized aspheric optical components to improve the resolution of the system, increase the field of view, reduce the complexity of the system, and reduce the weight of the system to reduc...

Claims

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Application Information

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IPC IPC(8): G01B11/25
Inventor 赵文川范斌万勇建伍凡
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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