Accession Number : ADD002895

Title :   Method of Determining Piezoelectric Constants of Ceramic Rings.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Zalesak,Joseph F ; Rogers,Peter H

Report Date : 04 May 1976

Pagination or Media Count : 6

Abstract : The patent relates to a method of ascertaining the piezoelectric constants (d sub 31,d sub 33,g sub 31,and g sub 33) of ceramic cylindrical shells (rings) used as the active elements in hydrophones and sound sources to insure quality control. These constants may be obtained by measuring the electrical capacitance of the ring and by measuring the omnidirectional free-field voltage sensitivity, the ratio of the axial and radial sensitivity at a higher frequency and the physical dimensions of the ring. Since the required frequencies are low and the ring is symmetric, the acoustical measurements can be made in a closed mechanically driven air chamber.

Descriptors :   *Piezoelectric transducers, *Patents, Ceramic materials, Rings, Piezoelectricity, Measurement, Hydrophones, Sonar equipment

Subject Categories : Electrical and Electronic Equipment
      Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE