Simultaneously resonated, multi-mode crystal force transducer

Details Simultaneously resonated, multi-mode crystal force transducer Simultaneously resonated, multi-mode crystal force transducer

1978-01-30

1979-03-20

Ruehl, Charles A.

Measuring and testing

Volumetric content measuring

73DIG4, 310338, 310366, 331163, G01L 116

Patent

active

041447476

ABSTRACT:
The invention is a single crystal force transducer in which the crystal is simultaneously resonated in two different modes having substantially the same frequency-temperature characteristics and different frequency-force characteristics. The difference in the change between the two resonant frequencies with a force applied to the crystal is therefore a temperature compensated signal indicative of the applied force. In the preferred embodiment the two resonant modes are anharmonic modes having a plurality of antinodes angularly disposed to each other.

REFERENCES:
patent: 3274828 (1966-09-01), Pulvari
patent: 3617923 (1971-11-01), Paradysz
patent: 3826931 (1974-07-01), Hammond
patent: 4039969 (1977-08-01), Martin

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