Piezoelectric body polarizing apparatus

Details Piezoelectric body polarizing apparatus Piezoelectric body polarizing apparatus

1994-02-02

1995-06-20

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Piezoelectric crystal testing

324652, 361225, G01R 2702

Patent

active

054263743

ABSTRACT:
A piezoelectric body polarizing apparatus including a DC power supply 2 for applying a DC voltage to a piezoelectric body 1 to polarize the piezoelectric body 1, an impedance measuring circuit 4 for measuring the change in impedance of the piezoelectric body 1, a high frequency power supply 5, and a DC current blocking filter 3 connected between a high frequency portion, which is constituted by the impedance measuring circuit 4 and the high frequency power supply 5, and the piezoelectric body 1. The DC current blocking filter 3 includes at least a DC current blocking capacitor C.sub.1 and a transient current bypass capacitor C.sub.2 connected between a node A, between the DC current blocking capacitor C.sub.1 and the high frequency portion, and a ground potential.

REFERENCES:
patent: 4447782 (1984-05-01), Rutkoski
patent: 5146174 (1992-09-01), Toliver et al.

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