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Infrared thermal imaging (thermographic) systems measure the self-emitted radiant energy from the surface of a target remotely and without contact, and produce thermal images in monochrome or color that characterize the distribution of surface temperature. Using the thermal distribution on the surface of a product sample as a measure of acceptability is only valid when thermal signatures of acceptable products have been studied, when standard acceptable patterns have been determined, and when maximum allowable deviations from these standards have been established.
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