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

A solar spectrum and irradiance technology, applied in the field of spectral measurement, can solve problems such as aberration and low spectral resolution, achieve high resolution, improve diffraction efficiency, and reasonably control aberrations

Inactive Publication Date: 2013-09-11
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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Examples

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Effect test

example 1

[0019] The solar spectrum irradiance monitor is designed for the 200-800nm ​​band, and the first-order diffraction of 400nm-800nm ​​and the second-order diffraction of 200nm-400nm are applied at this time. A planar grating with 600 line pairs / mm is selected, the curvature of the hyperbolic concave mirror is selected to be 356.10 mm, and its conic coefficient is -5.52; the curvature of the variable ellipsoidal concave mirror is selected to be 356.11 mm, and its conical coefficient is 0.66. The semi-off-axis angle α was set to 7°, the grating incident angle i was set to -2°, and the semi-off-axis angle β was set to 10.43°. The slit width is set to 50 microns, and the linear array detector is selected as two Hamamatsu ones with 2048 pixels, and the pixel size is 25 μm×2.5mm linear array CCD.

[0020] Corresponding to the above-mentioned solar spectrum irradiance monitor, the spectral resolution can be obtained in the 400nm-800nm ​​band to be 0.45nm, and the spectral resolution ca...

example 2

[0022] Changing the incident angle i of the grating in Example 1 to -4°, the curvature of the hyperbolic concave mirror is 358.76 mm, and its conic coefficient becomes -5.69; the curvature of the variable ellipsoidal concave mirror is 358.77 mm, and its conic coefficient becomes 0.69. At this time, the spectral resolution obtained in the 400nm-800nm ​​band is 0.43nm, and the spectral resolution obtained in the 200nm-400nm band is 0.22nm, and the modulation transfer function at the full-band cut-off frequency of the optical system is greater than 0.6, and the maximum dispersion spot in the whole band is uniform The square root radius is less than 1 / 3 of the cell width.

example 3

[0024] The solar spectrum irradiance monitor is designed for the 600nm-1000nm and 1200nm-2000nm bands. At this time, the first-order diffraction of 1200nm-2000nm and the second-order diffraction of 600nm-1000nm are applied. A planar grating with 300 line pairs / mm is selected, and the curvature of the hyperbolic concave mirror is selected through optimization design. The curvature is 322.87mm, and its conic coefficient is -3.01; . The semi-off-axis angle α was set to 6°, the grating incident angle i was set to -3°, and the semi-off-axis angle β was set to 8°. The slit width is set to 50 microns, and the linear array detector is selected as Goodrich’s one with 1024 pixels and a pixel size of 50 μm×2.5mm, and a Hamamatsu one with 2048 pixels and a pixel size of It is 25μm×2.5mm linear array CCD.

[0025] Corresponding to the above-mentioned solar spectrum irradiance monitor, the spectral resolution can be obtained in the 1200nm-2000nm band to be 0.87nm, and the spectral resolut...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/10G01J3/02
Inventor 方伟高震宇杨振岭
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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