Gas sensing apparatus and method

Details Gas sensing apparatus and method Gas sensing apparatus and method

G - Physics

01

N

324/25.5

G01N 27/04 (2006.01)

Patent

CA 1189143

GAS SENSING APPARATUS AND METHOD ABSTRACT OF THE DISCLOSURE 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 pre- ferably includes two semi-conductor type sensing elements in electrical parallel so that the difference in resis- tance 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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