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 geometric position deviation calibration method. The method comprises the steps: building the dynamic Young's laser interference fringe calibration system, and generating dynamic interference fringes in a far field through two high-stability laser beams with frequency difference; controlling the position and the distance of a laser optical fiber port through a six-degree-of-freedom displacement table; generating a plurality of groups of dynamic stripes with different spatial frequencieson the surface of an imaging chip of the image detector, recording the gray scale response value of each pixel of the detector under different spatial frequencies, and collecting a large enough number of stripe light field images; and based on a phase shift interference principle, by utilizing a least square fitting method, calculating the nanoscale geometric position deviation of pixels in the x-axis direction and the y-axis direction of the detector.

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 pixel geometric position deviation of an image detector based on the principle of phase shift interference. Background technique [0002] The star sensor is a high-precision space attitude measurement device with the stars as the reference system, the starry sky as the working object, and 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 captures and identifies the star map, and determines the satellite attitude and optical axis by calculating its position relative to the star in the celestial coordinate system. Pointing or target pointing to provide accurate spatial orientation and reference for aerospace vehicles such as satellites, intercontinental strategic missiles, and spacecra...

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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