Surface acoustic wave (SAW) devices coated with a thin film of a stationary phase sense chemical vapors In the gas phase by detecting the mass of the vapor that distributes Into the stationary phase. This distribution can be described by the partition coefficient. An equation is presented that allows partition coefficients to be calculated from SAW vapor sensor frequency shifts. The experimental responses of fluoropolyd-coated 158-MHz dual delay line SAW vapor sensors are converted to partition coefficients by this method, and these results are compared with partition coefficients determined by gas-liquid chromatography. These two methods rank the vapors In the same order of Increasing sorption, but Individual partition coefficient values are not always In precise agreement. The Influence of temperature and gas-phase vapor concentration on vapor sorption Is also examined.
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