Magnetic field sensors

Details Magnetic field sensors Magnetic field sensors

1985-09-18

1987-04-07

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Magnetometers

350371, 356345, 250231R, G01R 33032, G01B 902

Patent

active

046564217

ABSTRACT:
A magnetic field sensor in the form of an arcuate element comprising two superimposed strips of material is described. The magnetostrictive constant along the longitudinal axis of one of the strips is greater than that of the other strip, the latter strip carrying at each end a post. In use of the sensor a single mode optical fibre is attached to the element via the posts such that the part of the fibre between the posts extends along a chord of the arc defined by the element. A variation in applied magnetic field in the plane containing the arc gives rise to a variation in the part of the fibre between the posts. Light passing through the fibre is thus phase shifted by an amount dependent on the value of the applied magnetic field.

REFERENCES:
patent: 4368430 (1983-01-01), Dale et al.
patent: 4433291 (1984-02-01), Yariv et al.
patent: 4587487 (1986-05-01), Zanzucchi
Optical Fiber Sensor Technology, IEEE Journal of Quantum Electronics, vol. QE-18, No. 4, Apr. 1982, pp. 626-665.
An Introduction to the Theory and Use of Thermostatic Bimetals Engineering, pp. 1-12, published Sep. 1961.

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