1 April 1978 Forum
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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
Barry R. Johnson, "Forum," Optical Engineering 17(2), 170228 (1 April 1978). https://doi.org/10.1117/12.7972211 . Submission:
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