Environment measuring apparatus

Details Environment measuring apparatus Environment measuring apparatus

1995-03-25

1996-12-17

Williams, Hezron E.

Measuring and testing

Gas analysis

Moisture content or vapor pressure

7333505, G01N 2700

Patent

active

055855598

ABSTRACT:
A humidity measuring apparatus includes a device having a resistance thereof varied with a change of humidity, a resistor connected to the device, an oscillation circuit for supplying a square wave of a predetermined frequency across the device and the resistor, and a measuring unit for detecting a voltage between the device and the resistor to measure humidity. The oscillation circuit selectively supplies a square wave of a first frequency and a square wave of a second frequency lower than the first frequency. Thus, the humidity is measured with a high precision.

REFERENCES:
patent: 3523244 (1970-08-01), Goodman et al.
patent: 4386336 (1983-05-01), Kinomoto et al.
patent: 4419021 (1983-12-01), Terada et al.

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