The two most common spectral bands used in the thermal infra red are the 3-5 μm and 8-12 μm bands. For years, substantial controversy has occurred over which of these spectral bands has the greater merit. A qualitative approach to address this question is presented.
R.Barry Johnson, R.Barry Johnson,
"Relative Merits Of The 3-5 µm And 8-12 µm Spectral Bands", Proc. SPIE 0915, Recent Developments in Infrared Components and Subsystems, (3 October 1988); doi: 10.1117/12.945548; https://doi.org/10.1117/12.945548