Magnetomechanical transducer utilizing resonant frequency shifts

Details Magnetomechanical transducer utilizing resonant frequency shifts Magnetomechanical transducer utilizing resonant frequency shifts

1983-12-05

1988-01-19

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Displacement

324226, 73735, G01L 910, G01L 914, G01B 714, G01R 3300

Patent

active

047206764

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 greater than O, where K=zero.sqroot.(1-fr.sup.2 /fa.sup.2), fr and fa being the resonant and antiresonant frequencies, respectfully. The system is economical to construct and affords accurate and efficient measurement of pressure via displacements and angles of pressure sensitive devices 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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