Accession Number : ADD017361

Title :   Energy Absorption Apparatus.

Descriptive Note : Patent Filed 4 Jan 93, patented 6 Dec 94,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Powers, James M ; Moffett, Mark B ; Gilardi, Stephen S

Report Date : 06 Dec 1994

Pagination or Media Count : 11

Abstract : Apparatus for absorbing acoustic energy directed toward a wall. The apparatus includes a piezoelectric layer intermediate the wall and the source of the acoustic energy. Circuitry attached to the output of the transducer compensates blocked and motional capacitances of the transducer so that the output signal generates real current for dissipation in a resistor thereby to minimize any echo reflected from the piezoelectric layer. (AN)

Descriptors :   *ACOUSTIC ABSORPTION, *PATENTS, *ENERGY ABSORBERS, *PIEZOELECTRIC TRANSDUCERS, SIGNAL PROCESSING, VOLTAGE, FIELD EFFECT TRANSISTORS, PIEZOELECTRIC MATERIALS, ACOUSTIC SIGNALS, SOUND WAVES, ELECTRICAL IMPEDANCE, ANALOG SIGNALS, CIRCUIT ANALYSIS, CAPACITANCE, RESISTORS, ACOUSTIC REFLECTION, FEEDBACK AMPLIFIERS, DIFFERENTIATING CIRCUITS

Subject Categories : Electrical and Electronic Equipment
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE