Discrete attenuation of radiance thermography system (DART)

The DART system is a thermography system based on the UK Class II Thermal Imaging Common Modules. It uses a turret containing four filters as the means for selecting four different target temperature ranges. The physics of such a system is discussed, paying particular attention to the CMT SPRITE detector. In particular, the effect of the total photon flux incident on the SPRITE regarding the detector responsivity is discussed, together with the spectral responsivity. Finally, the consequences of this detector behavior are shown in terms of the relative NETD between a DART system and an alternative switched-gain head-amplifier based system, and a discussion of the sensitivities of these two systems. 12 references