Coronagraph external bunker position measurement system and position measurement method

Abstract

The coronagraph external shelter position measurement system and the external shelter position measurement method, by configuring the laser feedback interference system, adjust the reference light and the measurement light so that they are respectively incident on the support rod and the disk surface of the external shelter, and are directly reflected by its matte black surface Then return to the original path to form laser feedback for measurement. According to the measured length changes of the measurement reference light path and the measurement light path, combined with the structure and parameters of the two light paths, the displacement and angle change of the outer shelter of the coronagraph can be calculated. With the aid of the device and method, the outer shelter can be adjusted to an ideal central position, and the influence of the position change of the outer shelter on the stray light of the coronagraph can be studied when the ambient temperature or the vibration test condition changes. Through the measurement of the position of the external bunker and the quantitative analysis of the introduced stray light, the design of the coronagraph can be further improved and the overall level of stray light can be reduced.

Description

technical field [0001] The invention belongs to the technical field of space optical observation, and relates to a position change measurement system and a position change measurement method for a coronagraph outer bunker. Background technique [0002] The corona is the outermost structure of the solar atmosphere, and it is also the place where many solar physical phenomena occur, such as coronal mass ejection (Coronal Mass Ejection, CME), coronal flow and early solar wind evolution, etc., which also affect the near-Earth space environment and form space disasters The main driver of sexual weather. Therefore, real-time and long-term continuous observation of the corona can carry out many studies related to the driving sources of heliospheric and magnetosphere activities, which are extremely important for in-depth understanding of scientific issues such as solar activities, as well as practical issues such as space environment monitoring and space weather forecasting. [000...

AI Technical Summary

Problems solved by technology

Therefore, the remaining diffracted light at its edge will form stray light in the coronagraph, which will become the background noise affecting the coronal observation

If the outer bunker cannot be adjusted to the ideal position, the overall stray light suppression capability of the coronagraph will be reduced, and in severe cases, the coronagraph will even be unable to work, especially for the coronagraph carried by space satellites, the on-orbit performance will be greatly reduced

(The Cor2b coronagraph carried by the STEREO satellite launched in 2006 has seriously affected the normal work of the coronagraph due to the large deviation between the outer bunker and the inner bunker)

There is no effective method for accurate measurement of the coronagraph's external bunker. The reasons are: in order to reduce stray light, the surface of the bunker is black, and it is difficult to carry out non-contact measurement through light detection; and the size of the bunker is too small to be on it. Place the target mirror for measurement; and if the probe contact measurement is used, the mass distribution of the outer shelter will be changed, and the latter two methods cannot realize the position change test and the coronagraph stray light test at the same time, so it is difficult to accurately establish Correlation between external shelter and instrument stray light

Therefore, how to conduct non-contact measurement of the external shelter, a key component that affects the stray light of the coronagraph, is a difficult problem that needs to be solved, which will affect the overall stray light suppression level of the coronagraph

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