Apparatus for measuring a state variable in a gas with at least

Details Apparatus for measuring a state variable in a gas with at least Apparatus for measuring a state variable in a gas with at least

1996-11-06

1997-09-16

Williams, Hezron E.

Measuring and testing

Gas analysis

Detector detail

422 88, G01N 700

Patent

active

056683049

ABSTRACT:
To eliminate the effects of semiconductive sensor aging in the use of a semiconductive sensor for measuring the state variables of a gas in a system in which a pair of electrodes are embedded in an active semiconductive layer so that the conductivity of the semiconductive layer varies as a function of the state variable, a field electrode is provided and superimposed upon the measurement voltage, a voltage pulse is applied intermittently and the characteristic of the resulting current pulse is used to compensate for changes resulting from aging of the sensor.

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