Document Type

Article

Publication Date

8-13-1991

Abstract

A magnetometer which employs a rod of magnetostrictive material comprising a ternary alloy of dysprosium, terbium and iron wherein the grains of the material have their common principal axes substantially pointed along the axis of the rod. Means are provided for compressively stressing the rod in order to enhance themagnetostrictive response thereof. A laser source and photosensor are associated with a free end of the rod to function as an external cavity laser sensor. A DC magnetic bias is required for the magnetostrictive rod in order to operate in the sensitive range of the magnetostrictive characteristics of the rod. In a portable implementation of the device, the DC bias is provided by means of permanent magnets, preferably rare earth magnets, in order to provide the high bias fields compatible with high sensitivity of the material in a miniaturized portable device.

Patent Number

US 5,039,943

Assignee

Iowa State University Research Foundation, Inc.

Application Number

521,267

Date Filed

5-8-1990

Language

en

File Format

application/pdf

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