Table 2.

Specifications of two typical IR cameras.

Manufacturer	FLIR Systems, Inc.41	Optotherm42
Product	T500 series	Thermoscreen
Detector type	Uncooled microbolometer	Uncooled amorphous silicon
Pixel pitch ($\mu \mathrm{m}$)	17	17
Array size	$464\times 348$	$640\times 480$
Thermal sensitivity/NETD	$<30\mathrm{mK}$ at 30°C	$<40\mathrm{mK}$ at 30°C
Accuracy	$\pm 2°\mathrm{C}$	$\pm 0.3°\mathrm{C}$ between 30 and $40°\mathrm{C}\pm 1°\mathrm{C}$ otherwise
Operating temperature range	$-15°\mathrm{C}$ to 50°C	15°C to 35°C
Frame rate (Hz)	30	60
Working $F$-number	1.1 with 42-deg lens	1.02