General Infrared System Analysis
The design and evaluation of infrared image-forming systems for infrared medical radiography (thermography) is based on the interaction of the characteristics of detectors, optics, displays, and the characteristics of the subject and the background. Infrared technology has advanced so much in recent years that systems can be designed and built such that: the optics are limited only by diffraction effects; the detectors are limited only by photon noise; and the system is virtually ideal. Accordingly, this chapter starts with a derivation of an expression for the signal-to-noise ratio of an ideal infrared imaging system and then considers the efficiency factors of each of the components in turn.
KeywordsIntegral Temperature Ratio Temperature Kinetic Temperature Chromatic Aberration Atmospheric Transmission
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