Those images look like monochrome versions of what you see with a FLIR thermal imaging device, except the FLIR is in full color.
http://www.flir.com/home/
The equipment repair tech at our TV network had one of these so he could see components on PC boards that were overheating.
It's got the advantage of being passive - you don't irradiate IR light from the device as in those imaging systems.
Looking at their website, I see that they have introduced an add on thermal camera for use with SmartPhones. $400 for the better version...
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Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.