Light-splitting light path structure of broad-spectrum solar spectral irradiance monitor

Abstract

The invention relates to the field of spectral measurement, in particular to a space-based broadband solar spectral irradiance monitor for counterglow observation, and discloses a light-splitting light path structure of a broad-spectrum solar spectral irradiance monitor. The problems of large aberration and low spectral resolution of an existing solar spectral irradiance monitor under the conditions of a broad spectrum range and large relative aperture are solved by the light-splitting light path structure. The spectral optical path structure structurally comprises an entrance slit 1, a hyperboloid reflector 8, an ion beam etching plane grating 9, an oblate ellipsoid reflector 10, a beam splitter 5, a first linear array detector 6 and a second linear array detector 7. The light-splitting light path structure has the advantages of simple structure, high stability, high spectral resolution and the like.

Description

technical field [0001] The invention relates to the field of spectrum measurement, in particular to a wide-band solar spectrum irradiance monitor based on space observation of the sun Background technique [0002] At present, space-based solar spectrum irradiance monitors are divided into two types: prism light splitting and grating light splitting according to the light splitting elements. Among them, the optical path structure using the grating as the light splitting element adopts the Czerny Turner system. The light path structure of the light splitting is as follows: figure 1 As shown, it is mainly composed of an incident slit 1, a spherical collimating mirror 2, a plane grating 3, a spherical focusing mirror 4, a beam splitter 5, a first linear array detector 6, and a second linear array detector 7. The light emitted from the incident slit 1 is emitted as parallel light through the spherical collimating mirror 2, and is dispersed through the first and second order diffr...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of serious aberration and low spectral resolution of the existing solar spectrum irradiance monitor under the condition of large relative aperture in a wide spectral range, the present invention provides a light-splitting optical path structure of the wide-spectrum solar spectrum irradiance monitor , including: incident slit, hyperboloid reflector, ion beam etched planar grating, oblate ellipsoid reflector, beam splitter, first linear array detector and second linear array detector; the light emitted from the incident slit passes through the double The curved surface mirror emits collimated parallel light with an off-axis angle of 2α. The beam is reflected by the ion beam etched plane grating at the incident angle i to undergo primary and secondary diffraction. The diffracted light is converged and imaged by the flat ellipsoidal mirror. The off-axis angle is 2β, and the light reflected by the oblate ellipsoidal mirror is divided into two parts according to the wavelength by the beam splitter, which are imaged on the first linear array detector and the second linear array detector respectively.

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