Acoustic gas analyser

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Abstract
An instrument capable of measuring the concentration of halothane (bromochlorotri-fluoroethane) or chloroform vapour over a range of 0-4% by volume, with an accuracy of [plus or minus] 1/4%, is described. The gas containing the vapour is a mixture of air and oxygen, and the instrument compares the time taken by a pulse of sound to travel through the original gas sample with the time taken for another pulse to travel through the same sample alter the removal of the vapour by activated charcoal. Transistors are used throughout, and the instrument is small and self-contained.

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