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Optical Engineering

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Author(s): Barry R. Johnson
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Paper Abstract

A common form of the expression for NETD (Noise Equivalent Temperature Difference)* for FLIR (Forward Looking InfraRed) sensors suggests that the sensor SNR (Signal to Noise Ratio) is inversely proportional to the square of the f-number of the imaging optics. This is an incorrect conclusion in the case of nearly BLIP systems since the detectivity of an appropriately cold shielded detector array varies with f-number in such a fashion as to eliminate the f-number dependence to the first order. It is more appropriate to consider

Paper Details

Date Published: 1 April 1978
PDF: 8 pages
Opt. Eng. 17(2) doi: 10.1117/12.7972211
Published in: Optical Engineering Volume 17, Issue 2
Show Author Affiliations
Barry R. Johnson, Dynetics, Incorporated (United States)


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