Liquid crystal cumulative dosimeter

Details Liquid crystal cumulative dosimeter Liquid crystal cumulative dosimeter

1976-02-04

1978-01-03

Padgett, Benjamin R.

Compositions

Liquid crystal compositions

23230LC, 73356, 116114V, 252408, 428 1, C09K 334, G01K 300, G01K 1116

Patent

active

040665674

ABSTRACT:
Cumulative temperature dosimeter utilizes a temperature dependent reaction in a cholesteric liquid crystal composition to produce a color change indicative of temperature exposure over a period of time.
Typically, the composition includes, as a solvent, a cholesteric liquid crystal, such as a mixture of p-methoxy-p'-n-butyl-azoxybenzene, cholesteryl nonanoate, cholestyl chloride, and cholesteryl oleyl carbonate. One or more solutes are included, the solutes being reactive at a rate which is temperature dependent, to cause either generation or consumption of mesogenic compounds. In turn, the pitch of the solvent, observable as a visible color change, is affected in proportion to the cumulative temperature exposure of the composition.

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