Geometric calibration device for ultraviolet imager with extra large field-of-view

Abstract

The invention relates to a geometric calibration device for an ultraviolet imager with extra large viewing field. The geometric calibration device comprises a parallel light pipe system, a six-dimensional rotary table system and an angle monitoring system. According to the invention, the parallel light pipe system is utilized to generate ultraviolet parallel light beams along the radius vector direction of a image surface, so as to simulate an infinite target; the six-dimensional rotary table system is utilized to divide an instrument to be calibrated, with a large viewing field in a radius vector direction of a vertical image surface, so that the in the geometric calibration for the ultraviolet imager with the extra large viewing field, the requirements for stereoscopic spaces and consequent requirements for cost are finely reduced; meanwhile, the high precision and automatic level functionality of a theodolite system, as well as the digital electronic control and adequate small step length equivalent of the six-dimensional rotary table system enable the geometric calibration to have quite high accuracy and repeatability; the displacement of CCD pixel and the repeatability of sub pixel level can be achieved; the whole set of the geometric calibration device is not for a special use, so that the repeated utilization of the geometric calibration device is high; ultraviolet band signals are strong; the geometric calibration device can be utilized as soon as an installation is completed. The geometric calibration device has particularly remarkable effects on the geometric calibration of ultraviolet imager with an extra large viewing field.

Description

technical field [0001] The invention belongs to the technical field of optical geometric calibration, and in particular relates to a geometric calibration device for a super-large field of view ultraviolet imager, which utilizes equipment such as a collimator and a six-dimensional turntable to perform geometric calibration. Background technique [0002] Optical imaging instruments are used for scientific research, and the detected data not only needs to be determined by radiation calibration, but also needs to be determined by geometric calibration to determine the positional relationship between the detector pixel of the imaging instrument and the object to be photographed, both of which are indispensable . [0003] At present, the methods commonly used for geometric calibration of imagers at home and abroad include indoor or field calibration field, indoor multi-level calibration, etc. The basic principle is to project a series of object points with known geometric relatio...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the technical problem that the scale and cost of the geometric calibration device in the prior art are limited by the field of view and the spectral channel of the imager, and proposes a device for geometric calibration using equipment such as collimator and six-dimensional turntable. Geometric Calibration Device for Field Ultraviolet Imager

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