Photochromic ultraviolet detector

Details Photochromic ultraviolet detector Photochromic ultraviolet detector

1995-10-25

1996-12-03

Porta, David P.

Radiant energy

Invisible radiation responsive nonelectric signalling

Optical change type

250372, G01J 548

Patent

active

055810900

ABSTRACT:
An Ultraviolet detector based on the propriety of a photochromic composition in changing its color upon exposure to UV rays is described. The said photochromic composition contains a spiropyran or a spiroxazine molecule previously dissolved in a non-polar solvent such as toluene, cyclohexane, then mixed to clear plastics to be incorporated in any item e.g. watch, credit card, sunscreen bottle cap. The present UV sensor can also be used as a sun shading technique on a windshield of an automotive vehicle.

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D. S. Berger, Photochem. Photobiol. 24, 587, 1974 no month.
B. K. Dichter, Journal of Machine Perception, vol. 10, n4 19, 1993 no month .

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