That's an interesting design, though I'm skeptical as to how it would perform in real life. The important thing with IR is to not stand out from the surrounding background. Heat is an issue, yet lack of heat can be a problem too. Whatever you're using to cloak yourself with should be at the same ambient temperature as your surroundings so that you blend in. I like typical night vision gear, but I really like thermal scopes. A decent thermal scope will even show recent footprints on the ground from residual body heat. The ones that I typically use aren't great for fine definition, but they are effective enough to detect a human sized target at a distance of at least 150 yards in thick vegetation.