CANNING SYSTEM, INFRARED NOISE EQUIVALENT TEMPERATURE DIFFERENCE MEASUREMENT PROCEDURE

摘要

The noise equivalent temperature difference (NiAl) of an infrared scanning system is defined as the temperature difference, in degrees Centigrade (ºC), between two adjacent targets which will produce a peak-to-pack electrical signal equal to the rms noise in said signal. Unless otherwise specified, these targets are close to ambient temperature. However, in order to enhance measurement accuracy, one target may be as much as 10° C above ambient. Also, unless otherwise specified, each target is large in relation to the size of the scanner aperture.