Magnetomechanical transducers utilizing resonant frequency shift

Details Magnetomechanical transducers utilizing resonant frequency shift Magnetomechanical transducers utilizing resonant frequency shift

1983-11-04

1987-12-01

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Displacement

324262, G01B 714, G01R 3300

Patent

active

047107090

ABSTRACT:
A target adapted for use in a magnetomechanical transducer system is activated by an ac magnetic field and a variable dc bias field to produce a resonant frequency which corresponds to the effective strength of the dc bias field. The target includes an elongated ductile strip of magnetostrictive ferromagnetic material enclosed in a nonmagnetic container in a manner to allow the strip to vibrate freely. The strip has a magnetomechanical coupling factor, k.sub.1 greater than O, where k=(1-fr.sup.2 /fa.sup.2)1/2, fr and fa being the resonant and antiresonant frequencies, respectfully. The system is economical to construct and affords accurate and efficient measurement of displacements and angles at locations proximate to or remote from the signal source (target).

REFERENCES:
patent: 3706026 (1972-12-01), Johnson, Jr. et al.

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