Accession Number : ADD017614

Title :   Low-Frequency Electrostrictive Ceramic Plate Voltage Sensor.

Descriptive Note : Patent, Filed 2 Sep 93, patented 4 Apr 95,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Mermelstein, Marc D ; Vohra, Sandeep T

Report Date : 04 Apr 1995

Pagination or Media Count : 7

Abstract : This patent discloses a stress-driven electrostrictive ceramic low-voltage plate voltage sensor based on the principle of the field-coupling between the strain and polarization in the ceramic material of the device. Application of a dithering or driving voltage to a piezoelectric tube thereby generating an oscillating polarization whose amplitude is proportional to an applied low-frequency voltage. A electrostrictive ceramic wafer material affixed to the piezoelectric tube senses this oscillation and generates a displacement current. The displacement current represents a voltage output that is an amplitude modulated carrier whose displaced amplitude is proportional to an applied unknown signal voltage sought to be determined. (MM)

Descriptors :   *PIEZOELECTRIC MATERIALS, *ELECTROSTRICTION, *NOISE(ELECTRICAL AND ELECTROMAGNETIC), *PATENTS, *VOLTMETERS, FIBER OPTICS, OUTPUT, MAGNETIC FIELDS, DISPLACEMENT, CERAMIC MATERIALS, NOISE REDUCTION, WAFERS, OSCILLATION, LOW FREQUENCY, MAGNETOSTRICTION, LOW VOLTAGE, AMPLITUDE MODULATION, VOLTAGE AMPLIFIERS

Subject Categories : Ceramics, Refractories and Glass
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE