Dewpoint sensor

Details Dewpoint sensor Dewpoint sensor

1998-11-13

2000-06-13

Larkin, Daniel S.

Measuring and testing

Gas analysis

Moisture content or vapor pressure

73 2905, 374 16, 374 22, G01N 2566, G01N 2568

Patent

active

060734795

ABSTRACT:
A dewpoint sensor comprises a pressure vessel having an entry port, an exit port, and a temperature controlled plate. A quartz crystal resonator is housed within the pressure vessel and disposed in intimate contact with the temperature controlled plate. A temperature sensor is disposed to generate signals representative of the quartz crystal resonator temperature. Circuitry is coupled to the quartz crystal resonator and the temperature sensor, which circuitry is configured to control the temperature of the quartz crystal resonator, to measure the frequency of the quartz crystal resonator and to monitor the temperature signals and the frequency of the quartz crystal resonator when exposed to a flow between the entry port and the exit port so as to calculate a dewpoint value of the flow.

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Inamatsu, T. et al., "Dew-Point Hygrometer by Quartz Crystal", Moisture, Humidity, Process International Symposium, 1985, pp. 379-388.
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