There is a great deal of good reading at this link.
Infrared thermal imaging is a tough one to beat.
https://www.google.com/search?as_q=...59f243051ba0&lr=&q=defeating+thermal+infrared
Infrared thermal imaging is a tough one to beat.
https://www.google.com/search?as_q=...59f243051ba0&lr=&q=defeating+thermal+infrared