High-sensitivity coronagraph stray light detection device

Abstract

The invention provides a high-sensitivity coronagraph stray light detection device, and relates to the field of astronomical target observation and detection. The device comprises a low-brightness solar simulation device, a band-pass filter and a single-photon counting imaging detector. The band-pass filter is arranged between the coronagraph to be measured and the single-photon counting detector,and the single-photon counting detector is arranged on the focal plane of the coronagraph to be measured; the low-brightness solar simulation device emits 32'full-view-field simulated sunlight to enter the coronagraph to be detected, the band-pass filter performs wavelength selection on a wave band to be detected, and the single-photon counting imaging detector detects stray light brightness andsolar sun surface brightness of the coronagraph to be detected. The stray light inhibition capability of the coronagraph can be detected by respectively measuring the solar sun surface radiation and the stray light radiation of the coronagraph, and the difficulty that the stray light inhibition capability of the coronagraph cannot be directly detected by utilizing the solar radiation due to the influence of atmospheric scattering in a low-altitude area is overcome.

Description

technical field [0001] The invention belongs to the field of astronomical target observation and detection, and in particular relates to a high-sensitivity coronagraph stray light detection device. Background technique [0002] In the field of optical technology, the suppression level of stray light is one of the important indicators for measuring optical instruments, especially the instruments for measuring the corona, which have high requirements for suppression of stray light. This type of instrument acquires weak coronal images at the edge of strong solar solar radiation, and the brightness of the corona is extremely weak compared to the solar surface, and the inner corona brightness near the edge of the solar surface in the visible light band is only 10 -5 B ⊙ (B ⊙ : luminance at the center of the sun face), 2.5R away from the center of the sun face ⊙ (R ⊙ : the radius of the sun) the outer corona brightness is as low as 10 -7 B ⊙ , the farther away from the cente...

AI Technical Summary

Problems solved by technology

In addition, since photodiodes are used to detect light signals at the focal plane of the coronagraph, the diodes also need to be precisely calibrated, which is expensive

Moreover, because the diode cannot display the collected image, the detection result is not intuitive, and the receiving area of ​​the photodiode is very small, so it is difficult to cover the entire field of view of the coronagraph that needs to be detected at one time, and the real-time performance is poor.

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