Measuring and testing – Gas analysis – Gas chromatography
Patent
1980-10-17
1983-11-15
Kreitman, Stephen A.
Measuring and testing
Gas analysis
Gas chromatography
73 231, 422 98, G01N 2712
Patent
active
044148399
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.
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Dilley David R.
Lee Julian J. L.
Saltveit, Jr. Mikal E.
Board of Trustees, a Constitutional corporation operating Michig
Kreitman Stephen A.
McLeod Ian C.
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