There are plenty of microthermography apps, which is to mention, those which take place on microscopic scales. Many observed objects have temperatures under one hundred°C (212°File). Their respective object radiation is just too weak to be detected by NIR and SWIR sensors, but MWIR and LWIR cameras quickly detect these https://infraredimaging30730.blogadvize.com/34292509/the-definitive-guide-to-thermal-imaging