Science Forums 2

[Turtle]

Originally Posted by modest

Yes. But, the focal point might not be the same as for visible light. Quartz is recomended for imaging UV: Lenses for industrial applications-standard and custom lens design from Universe Kogaku

they say of their UV lenses:

Though they are optimized for 266nm you can see the wide range of transmission. Be advised that the lenses are NOT corrected for constant focus throughout this range. Re-focus will be required at different wavelengths

refocus necessary; check.

Originally Posted by Modert

I wonder what a good sized quartz lens would cost. You might be better off with a parabolic mirror, which I think Infinitenow's links use.

~modest

the only site i found that looked promising for finding a quartz lens price required registering. roger the parabolic reflector. i realized this morning that the reason the folks at In's link were using an eliptical reflector rather than parabolic is that the UV light source is at the focus, whereas for our business it is the water that is at the focus.

so if we put a bottle of contaminated water in a parabolic trough reflector, sterilization would be quicker than the bottle just sitting out in the Sun as previously described as effective sterilization, oui/no?

still wanting to know what part does the volume of the water treated play in the amount of time necessary for sterilization?

still looking for that big hand lens to try & fry some agua.