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Proceedings Paper

Coaxial near-infrared illumination and imaging optical system design with common aperture
Author(s): Dalin Song; Jun Chang; Yifei Zhao; Hongwei Song; Ye Yang; Guoliang Zhao; Yuan Ren; Qing Zhao
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Paper Abstract

Imaging optical system with coaxial common aperture near-infrared illumination containing both imaging optical path and illumination light path is established. The imaging optical path is coaxial and shares the front objective lens with the illumination light path. An aspherical short-focus single lens is adopted to decrease the blink surfaces in numbers and simplifies the optical structure. The ghost imaging path is traced backwards to locate the stray light. Absorption region set in the reflector plate eliminates the ghost images induced by the illumination rays reflected by front objective lens surfaces. A uniform rod is adopted to mix the light of near-infrared source, and the reflector plate locates in the conjugate position of aperture stop of both imaging optical path and the illumination light path, which can reduce the impact of occlusion of the reflector plate and ensure the illumination uniformity of the target object. The optical system covers the full field of view of 54° and imaging spectrum range of 450nm to 860nm. We offer the detailed design and simulation results. It shows that this optical system can make good imaging performances and illumination uniformity, and maintain compact structure.

Paper Details

Date Published: 19 November 2019
PDF: 9 pages
Proc. SPIE 11185, Optical Design and Testing IX, 111851H (19 November 2019); doi: 10.1117/12.2540296
Show Author Affiliations
Dalin Song, Beijing Institute of Technology (China)
The First Research Institute of the Ministry of Public Security (China)
Jun Chang, Beijing Institute of Technology (China)
Yifei Zhao, The First Research Institute of the Ministry of Public Security (China)
Hongwei Song, Beijing Benz Automotive Co., Ltd. (China)
Ye Yang, Beijing Municipal Bureau of Public Security (China)
Guoliang Zhao, Beijing Municipal Bureau of Public Security (China)
Yuan Ren, Beijing Municipal Bureau of Public Security (China)
Qing Zhao, Beijing Institute of Control and Electronic Technology (China)

Published in SPIE Proceedings Vol. 11185:
Optical Design and Testing IX
Yongtian Wang; Pablo Benítez; Osamu Matoba, Editor(s)

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