Patent ID: 9658101
Date: 2017-05-23
CPC Classifications: G01J,G01T

Claim:
1. A device for detecting or measuring UV radiation that is usable with sunscreen, the device comprising: (a) a colorant layer comprising (i) at least one photochromic material that is capable of changing its color when exposed to UV radiation, (ii) a polymer matrix in which the at least one photochromic material is distributed, wherein the polymer matrix may be susceptible to corrosion when the sunscreen comprises corrosive elements and the polymer matrix comes in contact with the sunscreen and optionally (iii) a component or components that change a rate at which the at least one photochromic material changes its color when exposed to UV radiation or inhibits the at least one photochromic material from reverting to its original color; (b) an over-layer atop the colorant layer comprising (i) a bottom surface that is in contact with a top surface of the colorant layer and (ii) an opposing top surface, the over-layer comprising a material that is constructed and arranged to allow at least a portion of the sunscreen, when deposited on the top surface of the over-layer, to be absorbed by the over-layer while preventing the sunscreen so deposited from penetrating through the over-layer to the colorant layer, the over-layer being transparent to allow UV radiation to pass through the over-layer to the colorant layer at least when the surface of the over-layer is not covered with the sunscreen.