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Secondary constant measuring method for aspherical mirrors

A quadratic constant and measurement method technology, applied in the direction of measuring devices, instruments, optical devices, etc., can solve problems such as difficult to measure accurately, and achieve the effects of easy operation, reduced detection cost, and balanced performance

Active Publication Date: 2014-09-10
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The technical solution of the present invention is to overcome the deficiencies of the prior art and provide a method for measuring the quadratic constant of an aspheric surface, which skillfully utilizes the accuracy of measuring the distance of the ranging interferometer and the accuracy of determining the position of the cat's eye without a hole in the center of the mirror surface. It effectively solves the problem that the distance in the device is difficult to measure accurately, and the effectiveness of using the distortion calibration to extract the centroid of the interference fringes to convert to the radius of the interference fringes on the mirror surface to solve the problem of measuring the radius of the mirror surface, and has a simple structure and easy operation

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  • Secondary constant measuring method for aspherical mirrors
  • Secondary constant measuring method for aspherical mirrors
  • Secondary constant measuring method for aspherical mirrors

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Embodiment Construction

[0037] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0038] Such as figure 1 Shown is a measurement device for the quadratic constant of a large-diameter aspheric primary mirror. The device includes: an interferometer 1 and a measured aspheric mirror 2. The specific implementation steps of the measurement method are as follows:

[0039] 1. Measure the specific process:

[0040] (a) Find the cat's eye. according to figure 1 As shown, adjust the interferometer 1 so that the focus of the standard lens is aligned with the apex of the mirror 2, and find the cat's eye position of the interferometer. The interferogram of the cat's eye position is as follows figure 2 shown. According to the ranging interferometer, record the position coordinates of the interferometer at this t...

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Abstract

The invention relates to a secondary constant measuring method for aspherical mirrors, and belongs to the field of photoelectric technology detection. The measuring method is performed in a vertical interferometer, and mainly aims at measuring the secondary constant and the vertex curvature radius of the aspherical mirror without a hole at the center. The method comprises the steps of: firstly using the interferometer to find the position of the cat eye of the mirror to be measured as an initial position of the interferometer, vertically moving the interferometer along the optical axis, extracting the pixel radius of the zero stripe of the interferometer, working out the actual radius of the mirror by calibrated distortion, and then working out the secondary constant and the vertex curvature radius of the mirror to be measured by using the corresponding moving distance according to a formula. The method is simple in structure, flexible to use and high in accuracy.

Description

technical field [0001] The invention belongs to the field of advanced optical manufacturing and detection, and relates to an optical detection method, in particular to a measurement method for the quadratic constant of an aspheric mirror. Background technique [0002] Most of the curved surfaces of lenses and mirrors used in optical systems are flat and spherical. The reason is that these simple curved surfaces are easy to process and inspect, but they have certain limitations when used in some high-precision imaging systems. For optical systems, the application of aspheric surfaces can increase the freedom of optical design, and play an important role in improving the imaging quality of optical systems, improving optical performance, and reducing overall size and weight. Compared with spherical surfaces, aspheric surfaces have better advantages in correcting aberrations. Often, one aspheric mirror can replace many spherical mirrors, thus greatly reducing the number and weig...

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Application Information

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IPC IPC(8): G01B11/00G01B11/255
Inventor 吴永前黄传科范斌
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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