Forgot your password?

typodupeerror

Comment: Re:Sigh (Score 4, Informative) 419

by feyhunde (#29296403) Attached to: Airborne Boeing Laser Blasts Ground Target
Visible light they reflect you mean. This is a hard concept for many people to grasp, but depending on the part of the spectra you are looking at, objects can vary to how much they reflect and how much they transmit. If everyone chooses the same reflector, like a cheap paint, you just gotta change the frequency of the light.

A great example is silver. In the very close UV, like 310 nm, it's completely transparent. Light goes thru it perfectly. by the time you get to Green light, it's over 90% effective at reflections. Good, somewhat expensive, white paint used as a reflectance standard is good between 250-2500 nm. The type of laser they have is about 1000 or so nm. Using frequency doublers you can make that high UV in 3 jumps and below the bottom of where the paint can reflect well. I've used such high powered lasers in Academia. Doublers are common.

Comment: Re:Chemical (Score 1) 491

by feyhunde (#28218439) Attached to: Best kind of engineering:

P.S.: Chemical Engineers do it in packed beds. This belongs on a bumper sticker.

Dude, it was my schools AIChE chapter's T-Shirt. I still have mine. Although today I'm wearing my reactor chart that mocks other majors in a form they can not read.

Tomorrow I may wear my 'Clothing Optional, Safety goggles required' shirt.

Work expands to fill the time available. -- Cyril Northcote Parkinson, "The Economist", 1955

Working...