Humidity sensor

Details Humidity sensor Humidity sensor

1979-05-07

1980-09-09

Goldberg, Gerald

Measuring and testing

Gas analysis

Moisture content or vapor pressure

G01W 100

Patent

active

042211298

ABSTRACT:
A humidity sensor utilizing the electrical output of a piezoelectric crystal held in compressive stress at one end of a lever arm, the fulcrum at the other end of the lever arm consisting of a flexure hinge of moisture sensitive material with a thickness under 10 mils. The crystal is nested in a frame to which the flexure hinge is attached and the frame hinge and lever arm may be molded out of the same moisture sensitive material. A moisture sensitive form of Nylon may be used for the flexure hinge. The signal output of the crystal is a function of the compressive stress which in turn varies as the modulus of the flexure hinge varies as caused by changes in ambient humidity.

REFERENCES:
patent: 3230402 (1966-01-01), Nightingale et al.
patent: 3368755 (1968-02-01), Smith et al.
patent: 3608376 (1971-09-01), Fenner
patent: 4163384 (1979-08-01), Blakemore

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