Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Study of Stray-light Analysis and Suppression Methods for the Spectroscopic System of a Solar-radiation Observer Instrument

  • Zheng, Ru (Department of Optoelectronic Engineering, Changchun University of Science and Technology) ;
  • Liu, Bo (Department of Optoelectronic Engineering, Changchun University of Science and Technology) ;
  • Wang, Lingyun (Department of Optoelectronic Engineering, Changchun University of Science and Technology) ;
  • Gao, Yue (CRRC Changchun Railway Vehicles Co. Ltd.) ;
  • Li, Guangxi (Department of Optoelectronic Engineering, Changchun University of Science and Technology) ;
  • Li, Changyu (Department of Optoelectronic Engineering, Changchun University of Science and Technology)
  • Received : 2020.12.24
  • Accepted : 2021.03.08
  • Published : 2021.06.25
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Abstract

To improve the measurement accuracy of a solar-radiation observer instrument, aiming at the problem of multiorder-stray-light interference caused by the diffraction of the flat-field concave grating in the spectroscopic system, straylight suppression methods for different forms of optical traps are studied. According to the grating surface-scattering distribution-function model, the bidirectional scattering distribution function (BSDF) of a dust-polluted surface and the flat-field concave grating's transition area of the spectroscopic system is calculated, and a Lyot stop with blade baffle is designed to suppress this kind of stray light. For diffraction multiorder stray light, based on the theory of light-energy transmission, a design for precise positioning of the trench optical trap is proposed. The superiority of the method is verified through simulation and actual measurement. The simulation results show that in a spectroscopic system approximately 160 mm × 140 mm × 80 mm in size, the energy of the stray light is reduced by one order of magnitude by means of the trench optical trap and Lyot stop, and the number of beams is reduced from 5664 to 1040. The actual measurements show that the stray-light-suppression efficiency is about 69.4%, which is effective reduction of the amount of stray light.

Keywords

Acknowledgement

The authors acknowledge financial support from the Research on Science and Technology of Education Department of Jilin Province during the 13th Five-Year Plan (JJKH20181133KJ).

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