Detection of organic vapours - by change in light transmitted by liq crystal coated wave guide subjected to vapour

摘要

A device for detecting organic vapours incorporates a wave-guide having a deposit on its surface consisting of a liquid crystal material, a source transmitting light along the wave guide and a means of measuring the light leaving the wave guide. The liquid crystal material is sensitive to organic vapour in that the organic vapour changes the power of transmission of the guide. The appts. gives a simple, flexible and rapid means of detecting and controlling organic vapours present in very small quantities in a gaseous medium, e.g. the atmosphere.