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Proceedings Article

Mid-wave infrared dual-field-of-view lenses with high ratio for third generation thermal imager

[+] Author Affiliations
Ronggang Li, Xingde Zhang, Lin Liu

North China Research Institute of Electro-optics (China)

Proc. SPIE 8197, 2011 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 819715 (December 05, 2011); doi:10.1117/12.905869
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From Conference Volume 8197

  • 2011 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments
  • Beijing, Beijing, China | November 06, 2011

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.

© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation

Ronggang Li ; Xingde Zhang and Lin Liu
"Mid-wave infrared dual-field-of-view lenses with high ratio for third generation thermal imager", Proc. SPIE 8197, 2011 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 819715 (December 05, 2011); doi:10.1117/12.905869; http://dx.doi.org/10.1117/12.905869


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