In this paper, the design and performance of an airborne long range thermal imaging system, operating in the 3 - 5 micrometer spectral band, is described. Comparisons of predicted and measured performance are provided. The system, which contains a dual field-of-view telescope, is stabilized to better than 5 microradians rms jitter and provides high quality thermal images with a spatial frequency resolution greater than 8 cycles per mradian.
R. Lawrence Sinclair,
"Stabilized FLIR for long-range airborne surveillance", Proc. SPIE 2744, Infrared Technology and Applications XXII, (27 June 1996); doi: 10.1117/12.243476; https://doi.org/10.1117/12.243476