Don't know, but I have read the thermal readers can read temps at long distances, and they have used them to locate caves; sometimes from an airplane.
There was an entire T'net thread on the possibility that cameras can be made/used to find goodies. Specifically gold. Ie.: that gold or silver would/can give off a specific reaction. Versus the surrounding landscape. Some people actually believe it's possible. And spend tons of time playing with lenses, practicing on targets, blah blah
Naturally I was the skeptic's voice, along with a few others on that thread. Which .... skepticism is frowned on there. Seen as "badgering" blah blah. But it was a good thread. You can read the various views there.
Imagine you have a buried metal plate. During the day, the sun warms the ground and the metal plate). Now, the plate and the surrounding ground that is at the same depth, are in thermal equilibrium (same temperature) Now, lets say that the sun is suddenly obscured by a dense cloud cover. The earth at the surface begins to cool down. There is then a temperature difference between the soil at the top and the soil (and the metal plate) at depth and therefore heat begins to flow to the surface. It is fundamental that heat energey can only flow across a temperature gradient, from the higher temerature to the lower temperature.
The next question to be asked is how much heat flows and does the heat from the metal plate flow any faster or slower that the heat in the surrounding ground. The amount of heat flow is inveresely proportional to the thermal resistance of the dirt between the metal plate and its surrounding layer, and the top of the ground. We should expect the thermal resistance of the material above the plate to be the same as that above the surrounding soil.
So, with the same starting temerature difference and with the same thermal resistance, the temperature of the metal plate and its surrounding soil will be pretty much the same so a thermal imaging camera should not pick up a difference.
Wait .... is this badgering and attacking the adherents of the method ? REPENT ! haha
Maybe the infrared technology is already able to.
I hope someday in the near future it will be also accessible for civil use.
It’s readily available, ...
Imagine you have a buried metal plate. During the day, the sun warms the ground and the metal plate). Now, the plate and the surrounding ground that is at the same depth, are in thermal equilibrium (same temperature) Now, lets say that the sun is suddenly obscured by a dense cloud cover. The earth at the surface begins to cool down. There is then a temperature difference between the soil at the top and the soil (and the metal plate) at depth and therefore heat begins to flow to the surface. It is fundamental that heat energey can only flow across a temperature gradient, from the higher temerature to the lower temperature.
The next question to be asked is how much heat flows and does the heat from the metal plate flow any faster or slower that the heat in the surrounding ground. The amount of heat flow is inveresely proportional to the thermal resistance of the dirt between the metal plate and its surrounding layer, and the top of the ground. We should expect the thermal resistance of the material above the plate to be the same as that above the surrounding soil.
So, with the same starting temerature difference and with the same thermal resistance, the temperature of the metal plate and its surrounding soil will be pretty much the same so a thermal imaging camera should not pick up a difference.
Well, there you go bringing Science into the discussion!!
Well, there you go bringing Science into the discussion!!
Yeah, Rudy is just a kill-joy. Likes to be argumentative. Sheesk, what are we going to do with him ?