Accession Number : AD0163688

Title :   Ferrofluid Ultrasonic Signal Modulator.

Descriptive Note : Patent,

Corporate Author : OFFICE OF THE SECRETARY OF THE ARMY WASHINGTON D C

Personal Author(s) : Parks,Jack G.

Report Date : 16 MAY 1972

Pagination or Media Count : 4

Abstract : The invention relates to ultrasonic modulators and more particularly to a bifluid ultrasonic modulator for amplitude or phase modulation of ultrasonic signals in the range of, for example, 10kHz to 500MHz. The ultrasonic signal modulator of the invention includes an interferometer wherein the chamber thereof are two immiscible liquids. One of the liquids is a ferroliquid and the other is a liquid that offers low attenuation to the wave transmitted therethrough. The application of a magnetic field to the interface of the liquids modifies the shape of the interface and thereby affects a change in the length of interferometer's path between the transmitting transducer and the interface resulting in amplitude modulation of the ultrasonic signal transmitted through the interferometer.

Descriptors :   (*ULTRASONIC RADIATION, MODULATORS), (*MODULATORS, *PATENTS), FERROMAGNETIC MATERIALS, HYDRODYNAMICS

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE