Process and apparatus for the determination of the inversion tem

Details Process and apparatus for the determination of the inversion tem Process and apparatus for the determination of the inversion tem

1976-10-05

1978-04-11

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01R 2922

Patent

active

040841316

ABSTRACT:
The inversion temperature of a quartz piezoelectric resonator is determined y exciting the resonator at its resonant frequency, bringing the resonator to a first temperature T.sub.h, obtaining the resonance frequency f.sub.o at the temperature T.sub.h as a standard of comparison for the subsequent measurement of resonator frequency variations, bringing the resonator to a second temperature T.sub.f and measuring the relative frequency spread (f-f.sub.o /f.sub.o) while the temperature is varying from T.sub.h to T.sub.f, detecting the maximum value of the frequency spread, and deducing the temperature at which the maximum value occurs. One of the first and second temperatures is greater and the other is less than the inversion temperature.

REFERENCES:
patent: 2178225 (1939-10-01), Diehl et al.
patent: 2470737 (1949-05-01), Bach
patent: 2691111 (1954-10-01), Minnich
patent: 3530377 (1970-09-01), Tanzman
patent: 3916303 (1975-10-01), Butuzov et al.

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