How to test sunglasses' uv blocking levels using UV meter?
September 10, 2010 3:50 AM Subscribe
I have access to a UV meter
. Using this tool how can I test the sunglasses I have actually filters out the light rays that are dangerous. I don't have any technical knowledge to interpret the numbers displayed by the tool.
posted by neworder7 to Science & Nature (7 answers total) 1 user marked this as a favorite
The sensor displays what it is measures (i think it is irradiance) in two ranges
1 μW/cm2 ~ 9999 μW/cm2
0.01 mW/cm2 ~ 40.00 mW/cm2
For example when I test it against a normal incandescent lamp from a reasonable distance it measures 261 μW/cm2 and behind the sunglasses it drops to 240 μW/cm2
Is this drop in the value indicative that sunglasses are providing the protection? How can I interpret these numbers in general?