Gas sensor

Details Gas sensor Gas sensor

2006-03-07

2009-12-15

Rogers, David A. (Department: 2856)

Measuring and testing

Gas analysis

With compensation detail

C073S023310, C073S025010, C073S025050, C073S031050

Reexamination Certificate

active

07631537

ABSTRACT:
A highly accurate gas sensor includes a circuit having an improved S/N ratio. First ends of a heat generating element and reference resistor brought into contact with a detected gas are commonly connected, and second ends are respectively connected to a first switch. The first switch is connected with a power source apparatus for supplying a current to the heat generating element or reference resistor. A voltage measuring portion measures a voltage across the heat generating element or reference resistor. An operating portion switches the first switch between the reference resistor and heat generating element by a predetermined timing by determining a condition of controlling a power source apparatus for supplying at least3stages of step-like currents to the heat generating element from the voltage across the reference resistor. A voltage measuring portion measures the voltage across the heat generating element and calculates a concentration of a detected gas.

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