Radiation-dose indicator and lamp and tanning apparatus comprisi

Details Radiation-dose indicator and lamp and tanning apparatus comprisi Radiation-dose indicator and lamp and tanning apparatus comprisi

1996-05-23

1998-01-27

Fields, Carolyn E.

Radiant energy

Invisible radiation responsive nonelectric signalling

Optical change type

G01J 150

Patent

active

057124850

ABSTRACT:
Radiation-dose indicator as well as a lamp and a tanning apparatus comprising such a radiation-dose indicator.
The invention provides a novel type of radiation-dose indicator which is reliable and accurate. The indicator comprises an optically active layer which includes a liquid-crystalline material as well as a radiation-sensitive compound. This compound is converted under the influence of radiation in such a way as to change the order of the liquid-crystalline material. Preferably, a trans-isomer is used as the radiation-sensitive compound, which is converted to the corresponding cis-isomer under the influence of radiation. In this way, the order of the liquid-crystalline material is broken. Indicators in accordance with the invention can very advantageously be used in UV- and IR-lamps as well as in tanning apparatus.

REFERENCES:
patent: 3627699 (1971-12-01), Goldberg et al.
patent: 3663390 (1972-05-01), Fergason et al.
patent: 3935337 (1976-01-01), Taylor
patent: 4863282 (1989-09-01), Rickson

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