To nomad:
Also visual identification by cammo net is easy.
As good as eye sight of human soldier. Camo net covered object is probably identifiable by human soldier from 100
meters and closer during day time. This range is not bad, not like 2 kilometers in Thermal spectrum.
Problem is about heat signiture. Saddam hide his tanks under bridge and under soil (he buried them) but the Americans
could see the heat of the tank from under the soil by thermal imaging camera !
If you hide tank in small bunker (dug out covered by wood with some soil on top), then you can only see warm air coming
out of entrance while tank is cooling out with engine switched off. You need to dump water on tank's engine to cool it
faster. During this cooling period enemy might see you in Thermal spectrum.
(1) Having cooling elements like fridge installed around a tank . This can be done by having coolant fluid run through
flexible plastic pipe that is inside a blanket ( like a heat blanket but in reverse ) . The tank provide electrics for
fridge . And heat exchanger put under tank and fan assist cooling the radiator. So at night tank is cool and same
temperature as soil.
Too complex. You only need lots of water stored in plastic container, not metal so it can be Stealth against enemy's
Radar. If water is hidden in bunker from sun, it's temperature will be around 25 degrees Celcius.
Then you dump all that water on tank's engine, cooling it at once to bunker's temperature (25 degrees Celcius).
All resulting water vapor have to be thrown out of bunker with large electric fan. Heated vapour escapes, leaving tank
as cool as bunker (so no different temperature is detected by Thermal detector). While water vapor escapes, it can be
seen for 5-10 minutes as hot (100 degrees Celcius) cloud outside the bunker. Once cloud is blown away by outside wind
bunker is not detectable.
(!) Except that tank inside the bunker can be seen by ground penetration Radar.
As tank is large metal target, reflecting large percentage of Radar radiation back to enemy's Radar.
(2) American provide heat resist paint for their tank ? But I don't know if this is true or not .
(3) British invent camo netting that uses some sort of tiles and ventilation against thermal imaging.
Both ways are rubbish. Since they only prolong non detection times to 10 minutes. Once tank's engine will heat up it
will also heat up paint (2) and camo net (3) in around 10 minutes. So heat from tank will be transfered to paint and
camo net, heating it up to detectable temperature in 10 minutes. At the end of 10 minutes both tank and paint and camo
net will be of the same (tank's engine) temperature, which is easily detectable in Thermal spectrum.
They also use it to hide troop body heat.
To hide the infantry troops you still need cool water in container and electric fan to evaporate water off the body
suit. But the job is much easier to cool off 36 (degrees Celcius) of human body than to cool off 700 (degrees Celcius)
of tank's diesel combustion engine. Very small amount of water is needed to cool off human.
There is another way to cool off human. If outside temperature is cold, you can run electric fan to pump outside cold
air into the body suit.
So there are multiple ways to cool the object:
1) Water cooling is called "Evaporative cooling".
2) Air cooling is called "Convection cooling".
3) Fridge cooling is called "Compressed gas cooling". It is used to cool off Igla MANPAD Thermal detector. When
pressurised gas is blown onto the object, it consumes heat and loses pressure.
If it is proved that tank can be hidden from all sides then yes no bunker is needed . And things much simpler .Also
there is two type of night vision
(1) first is in infrared that give different coloured display as we know and
(2) image intensifier like early ones that enhance light of stars in visible range.
The second one allows object to be distinguished even if they are same temperature, Simply by light and shade area like
daylight. How to stop this?
To stop this you have add material of surrounding terrain to your camo net. In desert you have to glue sand to your
camo net. Sand covered camo net and sand around will be of the same color for both light intensifier (2) detector (night time) and human eye (day time).
Also they use flares to light up sky in IR flares and normal flares, how to stop this? Also attacking in daytime
needed. How to hide?
Flares bounce flare light off your tank. You have to be covered in the same material as surrounding terrain to be
undetectable on top of the environment. Your tank has to have sand glued to it.