Electricity: measuring and testing – Electrostatic field – Using modulation-type electrometer
Patent
1983-09-13
1986-11-25
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Electrostatic field
Using modulation-type electrometer
355 14CH, 324457, G01R 2912
Patent
active
046251766
ABSTRACT:
This describes a vibrating probe for measuring electrostatic surface potential. A multilayered piezoceramic bender element assembly is provided with a multilayered shield surrounding the bender assembly on all sides except for one opening window. The conductive sense element of the bender assembly is located in the window and is positioned near the surface to be measured. The bender assembly includes a conductive layer sandwiched between a drive piezoceramic layer and a feedback piezoceramic layer. The feedback piezoceramic layer is coated (on the side opposite to the inner conductive layer) with the conductive sense element and with a separate conductive area for connection to a drive oscillator. The multilayered shield is comprised of inner and outer conductive layers sandwiching an insulator. A circuit is provided whereby the sensed signal floats on a high voltage signal applied to the conductive layers of the shield. A drive oscillator also floats on the high voltage signal and is connected to the drive element.
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U.S. Publication: Piezoceramic Bender Elements by Gulton Industries, Inc.
Champion James R.
Yeager Clarke A.
Eisenzopf Reinhard J.
International Business Machines - Corporation
Peterkin G.
Rohrer Charles E.
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