Partial pressure analysis of gases and gaseous mixtures - modulating gas in composition or pressure, passing through molecular diffusion path eg porous filter, polymer film, capillary or aperture to chamber and measuring pressure fluctuations.

摘要

The method involves modulating the composition or pressure of the gas (4) to be analysed and passing it along a molecular diffusion path (2) eg porous filter, polymer film capillary or aperture connected to a measurement chamber (1). Pressure fluctuations occur in the chamber as a result of the different diffusion times of different gas components. The pressure fluctuations are recorded by a pressure sensor (3). The modulation can be achieved by alternately feeding in a reference gas. USE/ADVANTAGE - For analysing gases and gaseous mixtures. Method enables quantitative and qualitative measurement of partial pressure with non-specific pressure sensors.