Testing device and method for defocused spot and color bias of optical system

Abstract

The invention relates to a testing device and method for the defocused spot and the color bias of an optical system, wherein the device comprises a monochromator, a target wheel, a collimator, a rotary table, a CCD (Charge-Coupled Device) micro-measuring unit and an acquisition and control computer; the monochromator, the target wheel, the collimator and the CCD micro-measuring unit are sequentially positioned on the same optical axis; the rotary table is used for arranging the tested optical system and the CCD micro-measuring unit; and the rotary table, the monochromator and the CCD micro-measuring unit are all connected with the acquisition and control computer. The invention can be used for effectively testing the defocused-spot diameters and the color biases of various optical systemswithin different wavelength ranges and well ensures the imaging quality of the optical systems.

Description

technical field [0001] The invention relates to a test device and method for the diffuse spot and color deviation of an optical system. Background technique [0002] The CCD star sensor is a high-precision optical sensor. It is an attitude sensor based on the star as a measurement reference. It mainly provides accurate information for the flight attitude and position of the spacecraft. The basic principle is to image a number of stars in the instantaneous field of view on the CCD photosensitive surface through the optical system, and through image processing and star catalog fitting, complete the identification of stars in the field of view, and then determine the current moment sensor light The orientation of the axis in the inertial coordinate system. Attitude measurement is realized through the measurement of the angular distance between stars, and the calculation accuracy of the center of the star image directly affects the measurement of the angular distance. This show...

AI Technical Summary

Problems solved by technology

[0004] 1. Low measurement accuracy

Due to the use of human eyes for observation, what the human eyes see is only the distribution of geometric shapes, not the distribution of energy, which cannot truly reflect the distribution of diffuse spots in the measured optical system. At the same time, due to the differences between individuals, the aiming error is large. The measurement accuracy of the diffuse spot size is about 10 μm, which can only roughly determine the range of the color deviation value, but cannot accurately measure the color deviation value

[0005] 2. The installation and debugging work is complicated and the test efficiency is low

Since the optical bench uses a halogen tungsten light source, if you want to obtain a monochromatic wavelength of the diffuse spot, you must add an interference filter in front of the light source, which greatly reduces the received energy, and because the transmittance of different filters is different , resulting in uneven energy, it is not easy to find the best image plane that meets the measurement needs, and the adjustment process is time-consuming and laborious;

[0006] 3. Limited by the visual function of the human eye, the spectral range of the measured optical system can only be limited to the visible light range

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