Oscillating crystal transducer systems

Details Oscillating crystal transducer systems Oscillating crystal transducer systems

1974-08-22

1977-04-26

Moskowitz, Nelson

Communications: electrical

Selective

Having indication or alarm

340 10, 310 91, H04B 1300

Patent

active

040204480

ABSTRACT:
A force transducer comprises a chamber; two matched plate-like crystals mounted facing each other within the chamber upright with respect to a base member provided within the chamber; electrical means for exciting each of the crystals; and means for transmitting a force to one of the crystals, including a spigot assembly which is mounted within the chamber by means of two spaced apart resilient supports and arranged to bear on one edge of said one crystal so as to produce in response to said force a change of the resonant frequency of that crystal with respect to the other crystal.

REFERENCES:
patent: 1912213 (1933-05-01), Nicolson
patent: 2947888 (1960-08-01), Harris
patent: 2962695 (1960-11-01), Harris
patent: 3292019 (1966-12-01), Hsu et al.
patent: 3370187 (1968-02-01), Straube
patent: 3748503 (1973-07-01), Cobarg et al.
patent: 3748504 (1973-07-01), Guntersdorfer
patent: 3856995 (1974-12-01), Cragg

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