UV Reflector Material

[Ioannis]

I am designing a portable germicidal lamp fixture. What materials
should I consider for the reflector given a 254 nm wavelength?
Approximate reflector dimensions are roughly 8" long x 3" wide x 2"
high. Am currently looking at Miro 4400UP by Alanod. Is there a
better material or at least an alternative?

Germicidal tubes emitting predominatly over 254nm, usually use polished
Aluminum reflectors, at least as far as I have seen from local
warehouses.

If memory serves me right, I think they have a reflectance of over
95-97% in UVC.

[Computasears]

Recently received a reflectance plot for Miro 4400UP. Its reflectance
at 254 nm varies from about 86% at 10 degree incidence angle up to 92%
at 70 degree incidence angle. The best reflectance is 94% to 95% in
the 300 to 370 nm region and occurs with a 10 degree incidence angle.

This material is specular polished aluminum and I suspect it has one
or more layers added to improve reflectivity. I would like to know if
there is a commercially available alternative which, hopefully, will
provide even better performance.

[Victor Roberts]

On Thu, 14 Aug 2003 12:58:09 GMT, Victor Roberts

Post by Computasears
Recently received a reflectance plot for Miro 4400UP. Its reflectance
at 254 nm varies from about 86% at 10 degree incidence angle up to 92%
at 70 degree incidence angle. The best reflectance is 94% to 95% in
the 300 to 370 nm region and occurs with a 10 degree incidence angle.
This material is specular polished aluminum and I suspect it has one
or more layers added to improve reflectivity. I would like to know if
there is a commercially available alternative which, hopefully, will
provide even better performance.

I believe Miro is silver-plated aluminum.

I am incorrect. Alanod Miro is aluminum that has been polished,
anodized and coated to produce a high reflectivity surface.

[Jonathan Scheuch]

I am designing a portable germicidal lamp fixture. What materials
should I consider for the reflector given a 254 nm wavelength?
Approximate reflector dimensions are roughly 8" long x 3" wide x 2"
high. Am currently looking at Miro 4400UP by Alanod. Is there a
better material or at least an alternative?

Unaxis makes a product called UV-Flex which is a UV cold mirror
coating on thin sheets of anodized aluminum sheet. You can find info
at the following link:

http://optics.unaxis.com/pod/SysDirs/publish/release/119RE.pdf

Jonathan Scheuch