We tested some commercially available IR temperature sensors
in actual use cases. In particular, we wanted to see how the
sensors performed at dynamic operational temperatures. Table 1
shows the performance of a traditional IR temperature sensor with
heated optics. The traditional sensor optical structure consisted of
a blackened metal tube and a Fresnel lens made of an IR transmitting
polymer placed at the tube head. The Fresnel lens collects IR
light from the target and aims it at the thermopile detector located
at the end of the tube.