Gas sensing apparatus and method

Details Gas sensing apparatus and method Gas sensing apparatus and method

1996-02-23

1997-05-06

Williams, Hezron E.

Measuring and testing

Gas analysis

With compensation detail

73 3106, 73 2901, 73 2334, 340632, 422 83, 422 94, 422 98, 338 34, G01N 2704, G01N 3112, G01R 300

Patent

active

056273053

ABSTRACT:
A gas sensing apparatus is disclosed including a gas sensing device that is self-heated due to an applied voltage, whose resistance variation amount is varied to thereby sense gas; a voltage supply for variably supplying a voltage to the gas sensing device; a current detector for detecting the current flowing through the gas sensing device thereby generating a current-voltage characteristic for the gas sensing apparatus under the effect of a given gas exposure; and a control and judgement portion for controlling the voltage supply to control a variation value of a voltage supplied to the gas sensing device and to determine the kind and density of a gas in an ambient atmosphere, using current-voltage characteristic reference data.

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