🧵 nonimaging concentrating optics
Anonymous at Sun, 9 Jun 2024 20:42:22 UTC No. 16225312
Why can't nonimaging concentrating optics be used to make a perpetual motion machine of the second kind?
>what are nonimaging concentrating optics?
Dunno really, supposedly it's meant to allow you to get past the problem of Etendue, which might stops you concentrating light to a brightness above the source. This obviously cant be otherwise we break entropy.
This is a paper using a NICO to increase the brightness of sunlight to pump a laser. The brightness achieved does not exceed the surface of the sun but gets close.
https://sci-hub.se/https://doi.org/
Anonymous at Sun, 9 Jun 2024 20:45:32 UTC No. 16225316
>>16225312
Here's a perpetual motion machine of the second kind using a NICO to concentrate emissions of a large, cold black body (BB) radiator to a hotter, smaller BB, allowing them to be in thermal equilibrium in a paradox.
If you could "somehow" make a NICO with a sufficient concentrating factor (concentrating the emissions from one area to that of another 16 times less), this would work.
Anonymous at Sun, 9 Jun 2024 20:49:55 UTC No. 16225328
>>16225312
Here is a much simpler paradox which allows two BBs to have their photon emissions in equilibrium, yet their temperatures be different.
The solution to this paradox is solved by making the BBs a finite size, as then the foci of the circle and ellipse no longer match correctly.
Good paper explaining it. Gives pretty pictures for a QRD.
https://www.researchgate.net/public
Anonymous at Mon, 10 Jun 2024 10:45:11 UTC No. 16226567
Bump
Anonymous at Mon, 10 Jun 2024 17:46:17 UTC No. 16227110
can someone get the fucking hands OFF of my dick?
Anonymous at Mon, 10 Jun 2024 17:52:45 UTC No. 16227117
>>16225328
I dont understand, is this a theorem, an experiment or some kind of intuitive proposal?
Anonymous at Tue, 11 Jun 2024 00:49:38 UTC No. 16227739
>>16227117
Like, I dunno man. Just hoping someone might know why I can't use an optic to focus light from a black body to an intensity greater than that at the BB's surface.
If you could do so, you can easily make a perpetual motion machine/perfect heat to energy generator as per >>16225316.
Anonymous at Tue, 11 Jun 2024 16:39:42 UTC No. 16228554
>>16227739
i dont know. I have some modest knowledge of optics and indeed you are not supposed to be able to concentrate light more than the source. Hence why a magnifying glass focusing sunlight will only make a small disk. I completely forgot why