thermal sensor, new redstone detector

idea came mostly at about time they added copper, block crafted with copper and iron, to represent bimetal, mechanism used to detect changes in temperature by using two different metal sheets, rest should involve probably redstone dust or torch as most redstone components use in crafting and cobblestone as "chassis" to stay consistent with visual and crafting recipes of other redstone components
as what it should do could be couple of things, from reacting to weather changes to detecting specific blocks, such as ice, lava, fire, closer some "thermal" block is, and more "powerful" it would be, stronger redstone signal would come out of it, thermal blocks would be any cold or hot block, and as more powerful could be considered blue ice over regular ice or lava over regular fire, copper blocks could also work as conductors and transfer this information to detector from other spot, but I imagine that would be hard to make work and not make game laggy with copper blocks checking for thermal detectors and thermal blocks around