Pointing optical axis and grating pose calibration system and method of satellite-borne double-grating collimator

Abstract

The invention discloses a pointing optical axis and grating pose calibration system and method of a satellite-borne double-grating collimator. The pointing optical axis and grating pose calibration system employs a calibration system which consists of a sun pointing lens, a sun pointing detector, a pose measurement lens, a monitoring feature point, a pose measurement detector and a control and processing unit, and is directly installed on the double-grating collimator. By analyzing relationships among the optical axis pointing change, the pose change of front and rear grating array planes andthe light spot position coordinate change and constructing a plurality of relational expressions, simultaneous calibration of the pointing optical axis and the grating pose can be realized by solvingthe characterization quantities of to-be-calibrated parameters; the pointing optical axis and grating pose calibration system is simple in structure and small in size, and facilitates load quantization; a processing algorithm is easy to realize; and meanwhile, various necessary information of the double-grating collimator during working can be calculated.

Description

technical field [0001] The invention relates to the technical field of optics and vision measurement, in particular to a system and method for calibrating a pointing optical axis and a grating pose of a space-borne double grating collimator. Background technique [0002] Solar flare research has always been a research hotspot in the field of solar physics, and it is of great significance to help explain the energy release mechanism of solar eruptions. [0003] Modulation imaging technology based on Fourier transform is often used for solar flare observation. This technology performs composite imaging of solar flares at different spatial scales by arranging double grating array planes before and after the incident optical axis. The two-layer grating array plane is called a double grating collimator. [0004] The double grating collimator is to place transmission gratings of various periods on two planes according to multiple angles to form a grating array, and place them at ...

AI Technical Summary

Problems solved by technology

[0008] In order to solve the inability to calibrate the pointing optical axis of the double-grating collimator in the existing way proposed in the background technology, and when the double-grating collimator is in orbit, the front and rear grating slits are misaligned, which affects the accuracy of flare detection. The problem of causing great adverse effects, the present invention proposes a system and method that can simultaneously accurately calibrate the pointing optical axis and grating pose of the double grating collimator, so as to use it as a method for inferring the detection accuracy and reliability of the flare image Criterion of Reliability

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