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Focal length and slit size calculation method for grating spectrometer optical system

A technology of grating spectrometer and optical system, which is applied in the field of aerospace optical remote sensing, can solve problems such as the inability to determine the focal length and size of the optical system of the grating spectrometer for space astronomical detection, and the inability to design the optical system, and achieve high-sensitivity detection and optimal design. Effect

Active Publication Date: 2020-04-24
BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
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Problems solved by technology

The focal length and size of the optical system of the grating spectrometer for space astronomical exploration cannot be determined in the prior art, so the detailed design of the optical system of the grating spectrometer for space astronomical exploration cannot be carried out

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  • Focal length and slit size calculation method for grating spectrometer optical system
  • Focal length and slit size calculation method for grating spectrometer optical system
  • Focal length and slit size calculation method for grating spectrometer optical system

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Embodiment Construction

[0021] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0022] This embodiment provides a method for calculating the focal length and slit size of the optical system of a grating spectrometer, the method comprising...

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Abstract

The invention discloses a focal length and slit size calculation method for a grating spectrometer optical system. The method comprises the following steps: building an optical system of the detectiongrating spectrometer of a space astronomical point source, and enabling the image quality of the optical system to reach a diffraction limit; obtaining the full width at half maximum (FWHM) of a starpoint image PSF at the slit according to the maximum wavelength lambdamax of the detection spectrum and the entrance pupil diameter D of the optical system; obtaining the focal length f' of the optical system according to the full width at half maximum FWHM of the star point image PSF at the slit, the spectral sampling rate n and the spectral direction pixel spacing p of the detector; obtaining the size of a first dark ring of an Airy spot according to the maximum wavelength lambdamax of the detection spectrum and the entrance pupil diameter D of the optical system; and obtaining the width Wsof the slit according to the focal length f' of the optical system, the magnification delta of the optical system and the size of the first dark ring of the Airy spot. The focal length and the size of the optical system of the grating spectrometer for space astronomical detection are determined, and detailed design of the optical system of the grating spectrometer for space astronomical detectioncan be realized.

Description

technical field [0001] The invention belongs to the technical field of space astronomical detection in the field of aerospace optical remote sensing, and in particular relates to a calculation method for the focal length and slit size of the optical system of a grating spectrometer. Background technique [0002] The spectrometer is an important analytical instrument for detecting the spectral characteristics of the target and analyzing the chemical composition and content of the target. Grating spectrometers are dispersive spectrometers, which have higher spectral resolution and signal-to-noise ratio than prism dispersive spectrometers. They are the most widely used spectroscopic instruments in the field of aerospace optical remote sensing. Meteorology, environmental disaster reduction, land and resources and other fields of space earth observation have been widely used, and grating spectrometers are also widely used scientific instruments in space astronomical exploration. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/02G01M11/00G01J3/28
CPCG01J3/2846G01M11/00G01M11/0221
Inventor 刘志敏安宁唐绍凡付智红贺瑞聪邓家全李康
Owner BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
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