Dynamic Young's Laser Interference Fringe Calibration System and Detector Pixel Geometric Position Deviation Calibration Method

Abstract

The invention relates to a dynamic Young's laser interference fringe calibration system and a detector pixel geometrical position deviation calibration method. The method includes: building a dynamic Young's laser interference fringe calibration system, and using two high-stable laser beams with frequency difference to generate dynamic dynamics in the far field Interference fringes; control the position and distance of the laser fiber port through a six-degree-of-freedom displacement stage, generate multiple groups of dynamic fringes with different spatial frequencies on the surface of the imaging chip of the image detector, and record the grayscale of each pixel of the detector at different spatial frequencies According to the response value, a sufficient number of fringe light field images are collected; based on the principle of phase shift interference, and using the least squares fitting method, the nanoscale geometric position deviation of the pixel along the x-axis and y-axis of the detector is calculated.

Description

technical field [0001] The invention relates to the field of optical image detector calibration technology and star sensors, in particular to a method for calibrating geometric position deviation of image detector pixels based on the principle of phase shift interference. Background technique [0002] The star sensor is a high-precision space attitude measurement device with the star as the reference system, the starry sky as the working object, and the optical sensitive components as the core. The star sensor detects the azimuth and distance between star point images at different positions on the celestial coordinate system and performs star map capture and identification, and determines the satellite attitude and optical axis by solving its own position relative to the stars in the celestial coordinate system Pointing or target pointing, providing accurate space orientation and reference for aerospace vehicles such as satellites, intercontinental strategic missiles, and sp...

AI Technical Summary

Problems solved by technology

However, in the prior art, there is no calibration method capable of high-efficiency, high-precision, large-scale data processing and application to detector pixel position deviations of various models, sizes and types, and most of them are not suitable for practical engineering applications.

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