29 November 1979 Response Of Long Focal Length Optical Systems To Thermal Shock
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Abstract
Aerial reconnaissance optical systems are often subjected to extremes in thermal environ-ment. Designers have been able to engineer systems which maintain stable performance over a wide range of steady-state temperatures. But, how long does it take a reconnaissance system to reach steady state after being subjected to a thermal shock (or step function)? This paper reports on experimental measurements made on several long focal length reconnaissance lenses exposed to thermal step functions. The most significant finding showed that the thermal recovery time is on the order of hours....a period during which the recon-naissance mission may already have been completed.
© (1979) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Joseph M. Geary, "Response Of Long Focal Length Optical Systems To Thermal Shock", Proc. SPIE 0193, Optical Systems in Engineering I, (29 November 1979); doi: 10.1117/12.957878; https://doi.org/10.1117/12.957878
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