Method and apparatus for detecting presence and concentration of

Details Method and apparatus for detecting presence and concentration of Method and apparatus for detecting presence and concentration of

1986-02-07

1988-04-05

Levy, Stewart J.

Measuring and testing

Gas analysis

Gas chromatography

G01N 2700

Patent

active

047350814

ABSTRACT:
A method of determining the concentration of a vapor in a gaseous fluid comprises the steps of passing a sample of the fluid through a channel having a crystal oscillator therein coated with a substance which absorbs the vapor, monitoring the deviation of the frequency of the oscillator from a base-line frequency representative of a fluid sample having a zero concentration of the vapor and converting the frequencydeviation, if any, to a numerical value indicative of the concentration of the vapor in the fluid.

REFERENCES:
patent: 3431770 (1969-03-01), Sanford et al.
patent: 3879992 (1975-04-01), Bartera
patent: 4116042 (1978-09-01), Jenkins et al.
patent: 4446720 (1984-05-01), Sinclair
patent: 4485666 (1984-12-01), Higgins et al.
patent: 4561286 (1985-12-01), Sekler et al.

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