Posted on 01/17/2020 1:48:51 AM PST by LibWhacker
The coating flouts the typical trend of hotter objects radiating more light
Hotter objects typically glow brighter than cooler ones, making them stand out in infrared images. But a newly designed coating bucks the rule that hotter equals brighter. For certain wavelengths of infrared light, the material’s brightness doesn’t change as it warms, researchers report December 17 in Proceedings of the National Academy of Sciences.
Made of samarium nickel oxide, the thin coating “hides temperature information of surfaces from infrared cameras,” and could therefore be used as a privacy shield, says applied physicist Mikhail Kats of the University of Wisconsin–Madison.
A basic rule of physics known as the Stefan-Boltzmann law states that the brightness of the thermal radiation emitted by an object grows rapidly with increasing temperature. Turn up the heat on an electric stove, for example, and the coils get brighter. The same trend goes for invisible wavelengths of light, such as infrared. Infrared cameras measure how much thermal radiation objects emit in infrared wavelengths to estimate their temperatures. So if the normal link between temperature and radiation is broken, the camera can be fooled.
(Excerpt) Read more at sciencenews.org ...
Opportunity: roofing for grow houses
What do they mean “could”. Amy of those Einsteins ever think to try it out?
Space blankets work
Later
“Samarian nickel oxide”
On sale this weekend at Walmart
Harbor Freight will have a 20% off coupon in this weekend’s sales circular.
Hell a piece of visqueen plastic held above the hot object will also remove the heat signature.
The damn illegal invaders on our southern border would use this trick all the time to hide from our thermals
from one photo caption:
developed a coating that may work as camouflage from infrared cameras, although it doesn’t yet operate at temperatures relevant for hiding humans.
The demo photo shows objects ‘hidden’ 100-140 deg. C.
Nasty Pelosi needs one of those blankets on her face.
They sure would. Cheap, too!
https://www.amazon.com/gp/product/B075YP8ZY8/ref=ppx_yo_dt_b_asin_title_o00_s02?ie=UTF8&psc=1
Been thinking of one for a ghilly suit liner but haven’t had a chance to test it.
Expect the application to be applied to license plates
for 'fee-free' touring on the interstates.
I tape them on the back of some of my window screens for insulation. You’d never know there is a window there as far as heat loss/heat gain goes. Eliminates condensation from the windows also.
That is an excellent idea. Thank you.
*ping*
Wow, sounds really good. Never heard of it before, but googling it makes it sound like it may be just the ticket for me: durable (at least more durable than a space blanket) and you can get it in larger sizes than a blanket. But there are two things about it and I'm wondering if you can help...
First, how much of the infrared radiation that hits it does Visaqueen plastic reflect? Space blankets claim they reflect 90 to 95 percent. I'd like to get close to that, but no one's saying what the number is for Visqueen, at least not that I can find.
Second, I'd like to buy Visqueen plastic in pieces (say a case of 100 pieces) at least as large as a space blanket, maybe a little bit larger, but smaller than a circus tent. Know anyplace that sells that? Holyshmoly! All I'm finding are websites like this -> https://www.discountvisqueen.com/catalog/greenhouse-plastic-sheeting-6-mil-uva-anti-drip-40-x-100-349, a leeeeetle bit larger than I need.
Thanks.
As far as size, all I have ever seen it come in is large roles. I have seen some gaylord bags that are made of a similar material with a mylar lining. Gaylord bags are about 4'x4'x4'.
I would not be surprised if a regular old black trash bag would not work. As long as you let it become the surrounding temp and then get under it your heat signature would go away.
Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.