Chilled piezoelectric hygrometer

Details Chilled piezoelectric hygrometer Chilled piezoelectric hygrometer

G - Physics

01

N

73/71

G01N 27/00 (2006.01) G01N 25/68 (2006.01)

Patent

CA 1301477

ABSTRACT A dew point hygrometer called a CHILLED PIEZOELECTRIC HYGROMETER, which is disclosed herein includes a dew point sensing element consisting of a piezoelectric quartz crystal resonator mounted on a Peltier cooler. The piezoelectric quartz crystal resonator is excited to its resonant frequency and cooled to the point of condensation of water vapor on its surface. As the condensation occurs, the mass of the condensed water vapor onto the piezoelectric quartz crystal resonator surface causes a change in the resonant frequency. A temperature sensor mounted on the surface of the piezoelectric quartz crystal resonator is use to monitor the temperature at which a dew deposit occurs. The digital nature of the dew point sensor allows features like autocompensation and autocalibration to be implemented in the instrument.

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