We have designed and manufactured an optical system with dual field of view (FOV) for an uncooled IR camera. Fnumber of the optical system with five elements is given by F/1.04. FOVs are given by 8°x6° for narrow FOV and 24° x 18° for wide FOV. One of the five lenses is linearly moved along the optical axis not only to change FOV but also to athermalize for the optical system. The movement of the lens is fulfilled with a stepping motor within a few micrometers' accuracy. The athermalization is compensated for 100 K of the temperature difference. The optical system is integrated into an uncooled IR detector engine to verify the optical performance of the dual FOV IR system. The uncooled IR detector consists of 320x240 pixels with 25μm pitch. Minimum resolvable temperature difference (MRTD) as measured values at each FOV will be presented in this paper.

Date Published: 21 August 2009
PDF: 6 pages
Proc. SPIE 7433, Optical System Alignment, Tolerancing, and Verification III, 743307 (21 August 2009); doi: 10.1117/12.825847

Published in SPIE Proceedings Vol. 7433:
Optical System Alignment, Tolerancing, and Verification III
José Sasián; Richard N. Youngworth, Editor(s)