A laser-scanning high-sensitivity coronagraph stray light detection device

Abstract

A laser-scanning high-sensitivity coronagraph stray light detection device relates to the field of astronomical target observation and detection, the device includes: a single-beam laser scanning device, a multi-dimensional adjustment stage, a band-pass filter and a single-photon counting detector; a single-beam laser The scanning device, the coronameter to be measured, the bandpass filter and the single-photon counting detector are arranged in sequence and arranged on the same optical axis, and the single-photon counting detector is arranged on the focal plane of the coronagraph to be measured; the single-beam laser scanning device is installed on On the multi-dimensional adjustment table. The invention has higher detection sensitivity and lower noise, and the detection sensitivity and dark noise can reach 0.5counts.s ‑1 .cm ‑2 . It has better working stability and beam collimation, and realizes stray light detection in different wavelength bands by replacing the laser. The stray light radiation of the coronagraph and the solar surface radiation are scanned and measured separately by the same laser beam, and the stray light suppression ability of the coronagraph to be measured is obtained by integration, avoiding the problem of stray light detection using an expensive high-brightness 32' field of view solar simulator .

Description

technical field [0001] The invention relates to the field of observation and detection of astronomical targets, in particular to a laser scanning type 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 fr...

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, since the diode actually displays the current value, the collected image cannot be displayed, and the detection result is not intuitive.

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