Magnetostrictive magnetometer

Details Magnetostrictive magnetometer Magnetostrictive magnetometer

1990-05-08

1991-08-13

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Magnetometers

324260, G01R 3302

Patent

active

050399438

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 the magnetostrictive 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.

REFERENCES:
patent: 4308474 (1981-12-01), Savage et al.
patent: 4609402 (1986-09-01), McMasters
patent: 4770704 (1988-09-01), Gibson et al.
patent: 4818304 (1989-04-01), Verhoeven et al.
patent: 4849034 (1989-07-01), Verhoeven et al.
"An External Cavity Diode Laser Sensor", Miles et al., Journal of Lightwave Technology, vol. LT-1, No. 1, Mar. 1983, pp. 81-92.
"Barkhausen Effect And Discontinuous Magnetostriction In Terfenol-D", Jiles et al., J. Appl. Phys. 64(10), 15 Nov. 1988, pp. 5417-5418.

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