Method of identifying a gas

Details Method of identifying a gas Method of identifying a gas

1999-05-12

2000-12-26

Warden, Sr., Robert J.

Electrolysis: processes, compositions used therein, and methods

Electrolytic analysis or testing

For oxygen or oxygen containing compound

205781, 2057795, 205783, 2057865, 205787, 205793, 204409, 204431, 422 97, 436152, G01N 27404, G01N 2716

Patent

active

061653470

ABSTRACT:
A method and apparatus for identifying an unknown reactive gas in a carrier gas, utilizing a sensor with a diffusion limited inlet. After a signal is established for the carrier gas, a flow of the mixture of carrier gas and reactive gas is passed to the sensor and a steady state signal S is established. Then, the input to and output from the sensor are closed, and the steady state signal decays as a known volume of reactive gas is consumed. The decay curve of the signal is integrated to produce an integrated response .SIGMA., and the ratio S/.SIGMA. is proportional to the diffusion coefficient for the reactive gas. By comparing this ratio to the ratio for a known reactive gas, the identity of the unknown reactive gas can be determined.

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Podkowka et al "Comparative Evaluation of Diffusion Coefficients for Gases and Vapors of Organic Substances through Polyethylene Membranes Determined by Absorption and Desorption Upstream Time Lag Method", J. App. Polymer Sci. 27, pp. 1471-1478, 1982.

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