Gas sensing apparatus and method

Details Gas sensing apparatus and method Gas sensing apparatus and method

1980-12-18

1983-10-18

Marcus, Michael S.

Chemistry: analytical and immunological testing

Food or dairy products

73 27R, 422 89, 422 96, 422 98, 436 93, 436126, 436128, 436140, 436142, 436131, 436152, 436161, G01N 3302, G01N 2716

Patent

active

044106327

ABSTRACT:
A sensing apparatus and method for qualitatively and quantitatively analyzing small amounts of selected oxidizable gases in a carrier gas including the associated electronic circuitry is described. The apparatus preferably includes two semi-conductor type sensing elements in electrical parallel so that the difference in resistance of the two sensors can be detected, which can be of the N or P type and which decrease or increase in electrical resistance as a function of the concentration of an oxidizable gas. Also, a method for determining fruit maturity and ripeness by the detection of ethylene in the internal atmosphere of a fruit is described which preferably uses the apparatus with the semi-conductor type sensing elements, but can use other variable resistance type gas sensing means.

REFERENCES:
patent: 2965842 (1960-12-01), Jacobson
patent: 3097518 (1963-07-01), Taylor
patent: 3097520 (1960-03-01), Thompson
patent: 3603134 (1971-09-01), Norem
Figaro Engineering Ltd., Leaflet Entitled "Figaro Gas Sensor TGS", Osako, Japan, May 1, 1976.
Burg, S. P., et al., J. of Biochemical and Microbiological Technology and Engineering, vol. 1, No. 3, pp. 245-259 (1959).
Hamilton--Application of the Fisher Model 25 Gas Partitioner to Respiratory and Blood Gas Deter. Aug. 31, 1961.

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