![]() If you trap heat, the imager can’t detect it. On the other hand, old trees with a dense canopy can conceal you from all but the most sophisticated military imagers. If you’re deep enough in the woods you’re also safe from detection – from ground level, at least.Īn airborne thermal camera, looking down, can see through a light forest canopy. Light brush or grass won’t block your body heat, but heavy undergrowth will. ⇒ Do You Know Why You Should Never Put A Tall Fence Around Your House?īe careful with vegetation. Stud partitions or drywall won’t reliably block your body heat, and some military systems can see through a single layer of brick, but a brick cavity wall or masonry is enough to hide you. No imager can see through a hill or rolling ground, so if you can put terrain between you and it, you’re invisible. If you’re moving across country, use the ground. The thermal radiation you give off can penetrate some things that would hide you from visual detection, but it can’t penetrate everything. Hide Behind ThingsĪ thermal imager is like any other sensor it can’t see you if you’re hiding behind something that blocks the signal it detects. If your pursuer has a conventional sc ope you do that with camouflage if he has a thermal imager you’ll need to adapt your techniques, but the basic aim is the same. Your challenge is to avoid standing out in the sensor display. Hiding from a thermal imager follows the same basic principles as hiding from anything else. If a thermal imager is scanning for you it’s a lot harder to hide.īut it isn’t impossible, and if you know what you’re doing you have a good chance of evading detection. They penetrate rain and falling snow, although those can reduce their range by more than half. Unlike standard night vision devices, thermal imagers don’t need any light at all to pick you up. These days, if someone’s looking for you it’s smart to assume they have a thermal imager to help them. You can even get a $249 plug-in module for your smartphone that will pick up a hidden object a few yards away by its thermal emissions. For $600 you can get a hand-held imager with a range of over 100 yards. Less than $2,000 will buy you a rifle scope that lets you shoot out to more than 300 yards in complete darkness. And, while imagers were once heavy and incredibly expensive systems that needed to be cooled with refrigerated gas, they’ve become a lot smaller and more affordable. The effective range of a thermal imager is from a few dozen yards for the smallest handheld units, up to thousands of yards for large military surveillance systems and weapon sights. ![]() It doesn’t matter how expertly camouflaged something is – if it’s warmer or cooler than its background, it will show up. It works by picking up the infrared radiation – basically heat – radiated by objects, and displaying the different temperatures. Thermal imaging is also called passive infrared. The state of the art in surveillance is thermal imaging, and that’s a lot harder to hide from. Now a few hundred dollars will buy you a much more effective night sight that weighs a few ounces, or a good set of night vision goggles – but night vision is old technology now. The first night vision device I ever used was an old Individual Weapon Sight, a huge starlight scope that cost as much as a pretty good car and weighed more than the L1A1 battle rifle it was mounted on. Modern surveillance technology can be scarily effective, and it’s getting better all the time.
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