Apparatus and process for measuring the resonant frequency and c

Details Apparatus and process for measuring the resonant frequency and c Apparatus and process for measuring the resonant frequency and c

1976-01-13

1976-11-23

Abercrombie, Willie G.

Metal working

Piezoelectric device making

B01J 1700, H04R 1700

Patent

active

039927601

ABSTRACT:
Apparatus is provided for measuring the resonant frequency and the coefficient of coupling of a plurality of coupled piezoelectric resonators. A plurality of electrode terminals are provided in the apparatus for connection to respective resonator electrodes, and a common terminal is provided for connection to common electrodes of the resonators. First switching means are connected to a signal source for applying the signal selectively to one of the electrode terminals. A parallel resonant circuit is coupled between each of the electrode terminals and the common terminal respectively to provide a relatively high impedance at the resonant frequency of the adjacent resonators. Second switching means are connected in parallel with the parallel resonant circuits for selectively short-circuiting the resonant circuits. In operation, the resonant frequency of each of the resonators is indicated by applying a signal of the proper frequency to the apparatus with the resonant circuits not short-circuited, and measuring resonant frequencies in the apparatus. Coupling between adjacent resonators is indicated by applying a range of signal frequencies to the apparatus with selected resonant circuits short-circuited, and measuring resonant frequencies in the apparatus.

REFERENCES:
patent: 3763530 (1973-10-01), Helfen
patent: 3851385 (1974-12-01), Meisner

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