The Shape and Size of Glare Around Bright Lights

Ravi

Member
20mm, 2mm thick, for 20 bucks. Not bad! Be careful with them, is my advice. If you drop em, they crack.
 

Mick West

Administrator
Staff member
20mm, 2mm thick, for 20 bucks. Not bad! Be careful with them, is my advice. If you drop em, they crack.
It's unpolished. But I've got a polisher, and it will be interesting to see how well it works without polishing. I was quite surprised what a good image you get reflected from a matt metal surface, so maybe a window might work somewhat with not polishing.

Here's a metal surface reflecting my hand in thermal IR.
Metabunk 2020-09-12 12-53-57.jpg

But, it's matt, with near-zero specular reflectivity.
Metabunk 2020-09-12 12-56-33.jpg
 

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Ravi

Member
Nice example!

It's of course all due to the use of long wavelengths. You need half-lambda surface quality to make a "mirror", for IR of say 10 um, this comes down to 5um, which is what likely is the surface roughness of the metal part shown.
 
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