Allied Corporation

Alliedsignal Inc.

Donald Raskin

Philip M Anderson, Iii

Ronald K Reich

James E Kearney

Errol A Haznedar

An acoustic transducer is provided that uses a layer of magnetostrictive ferromagnetic material having high magneto-mechanical coupling. The ferromagnetic material is adhered to a part of the outer surface of a resilient rod, so that an incident acoustic signal causes a change in stress in the magnetic material and, in turn, a change in the material's magnetization. An electrical coil surrounds the magnetic material and converts the changing magnetization into an electrical signal. A plurality of transducers may be assembled into an array and towed behind a ship to detect underwater acoustic signals.

Magnetostrictive acoustic transducer

This invention provides a vibration sensor for detecting vibrations having preselected frequencies. The sensor has a plurality of tuning mechanisms each being mechanically resonant with a different preselected vibrational frequency. The resonating vibrational movements of these tuning mechanisms apply varying stresses to a plurality of glassy magnetostrictive elements associated therewith. Each of the magnetostrictive elements is responsive to a different one of the tuning mechanisms. A magnetic biasing element imparts a magnetization to the magnetostrictive elements and a detecting mechanism associated with the magnetostrictive elements detects changes in the magnetization thereof caused by the varying stresses applied thereto.

Tuned vibration detector

This invention comprises a vibration sensor for detecting engine knock. The sensor has a tuning mechanism which is mechanically resonant with a preselected vibrational frequency. The resonating movements of this tuning mechanism are adapted to apply varying stress to an associated magnetostrictive element. A magnetic biasing element imparts a magnetization to the magnetostrictive element and a detecting means is associated with the magnetostrictive element for detecting changes in the magnetization caused by the varying applied stress.

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New York, NY, United States of America

Donald Raskin