Dee10
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Yes , but there are a lot of variables at play which need to be considered. In order for FLIR to detect the heat emitted from the child it requires a cooler background , which in this case would be the ground , trees and rocks
The terrain must first cool down , which means after sundown plus several hours for everything to cool off . Once the ground cools a head would produce the best heat source , and clothing would block a lot of the rest of body heat , esp jackets.
It is a good system but if the child is deceased by late evening it will not show up (no heat being produced) , or if the child is under a big log it could block the heat , and of course anything under water would not show up.
But yes , if the boy was alive and not hidden by debris or terrain the helicopter should have found him.
I thought it could penetrate a log for instance as fire-fighters can use this technology to see if someone is inside a house, but maybe in depends on the thickness? Fascinating technology though.