Gas density transducer

Details Gas density transducer Gas density transducer

1986-07-25

1988-03-29

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

73 30, 73703, 73708, 310311, 310312, 310338, 310370, 310317, 310319, H01L 4108, G01N 3100, G01L 1100

Patent

active

047346094

ABSTRACT:
An improved gas density transducer which compares the resonant frequency of an enclosed, reference tuning fork crystal oscillator with the resonant frequency of a detector tuning fork crystal oscillator exposed to the surrounding gas. The frequency of oscillation of the detector crystal oscillator exposed will vary in accordance with the gas density because of the motional resistance of the gas to vibrations of the tuning fork oscillator. The frequency of the detector oscillator can be compared to the frequency of the reference oscillator to determine the gas density.

REFERENCES:
patent: 3045491 (1962-07-01), Hart
patent: 3844174 (1974-10-01), Chabre
patent: 3879992 (1975-04-01), Bartera
patent: 3902355 (1975-09-01), Weisser
patent: 4223524 (1980-09-01), Nakagawa
patent: 4227182 (1980-10-01), Ogasawara et al.
patent: 4456892 (1984-06-01), Vandergraaf
patent: 4479070 (1984-10-01), Frische et al.
patent: 4507970 (1985-04-01), Dinger
patent: 4558248 (1985-12-01), Valentin

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