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

Ronggang Li; Xingde Zhang; Lin Liu

doi:10.1117/12.905869

5 December 2011 Mid-wave infrared dual-field-of-view lenses with high ratio for third generation thermal imager

Ronggang Li, Xingde Zhang, Lin Liu

Proceedings Volume 8197, 2011 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments; 819715 (2011) https://doi.org/10.1117/12.905869
Event: International Conference on Optical Instruments and Technology (OIT2011), 2011, Beijing, Beijing, China

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.

Citation Download 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 (5 December 2011); https://doi.org/10.1117/12.905869

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available