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Proceedings Paper

Mid-wave infrared dual-field-of-view lenses with high ratio for third generation thermal imager
Author(s): Ronggang Li; Xingde Zhang; Lin Liu
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Paper Abstract

A Dual-field-of-view (DFOV) lenses has been developed, which is for MWIR band with high ratio used by 3rd generation thermal imager. The lenses change the field of view by flipping in or out a group of optical elements. The lenses' ratio of DFOV is six, the focal length of narrow field is 240 millimeter, F-number is 4. As a result of smaller pixel size, the lenses have to provide high image quality. It is folded to get smaller volume. Because the detector contains cold stop and the lenses contains moveable group, narcissus is examined and minimized. Reference source is set at a suitable position to correct non-uniform of detector. Field stop is set at the first image surface to minimize stray light. The lenses improve thermal imager spatial resolution by micro-scanning which is realized by jiggling motion of the last element at two directions.

Paper Details

Date Published: 5 December 2011
PDF: 7 pages
Proc. SPIE 8197, 2011 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 819715 (5 December 2011); doi: 10.1117/12.905869
Show Author Affiliations
Ronggang Li, North China Research Institute of Electro-optics (China)
Xingde Zhang, North China Research Institute of Electro-optics (China)
Lin Liu, North China Research Institute of Electro-optics (China)


Published in SPIE Proceedings Vol. 8197:
2011 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments
Yongtian Wang; Yunlong Sheng; Han-Ping Shieh; Kimio Tatsuno, Editor(s)

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