Fiber-optic magnetic field gradiometer for first, second and hig

Details Fiber-optic magnetic field gradiometer for first, second and hig Fiber-optic magnetic field gradiometer for first, second and hig

1988-03-18

1989-03-21

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Magnetometers

324260, 350 9629, 250227, 356345, G01R 33022, G01R 33023, G01B 902

Patent

active

048147060

ABSTRACT:
A fiber-optic magnetic field gradiometer uses the second derivative of a magnetic field to determine the location of a ferromagnetic object located in an array of objects. Three adjacent magnetic transducers made of several layers of magnetostrictive glass are wrapped with an optical fiber and immersed in an applied magnetic field to null out material differences and the earth's magnetic field. The null conditions for each adjacent pair are accomplished without disturbing the null conditions of the other adjacent pair. A magnetic field to be detected along the axes of the magnetic transducers causes an optical path length change in the fibers. The overall path length change is proportional to the second derivative of the magnetic field.

REFERENCES:
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patent: 4591786 (1986-05-01), Koo et al.
Koo et al., "A Fiber-Optic Magnetic Gradiometer", Journal of Light-Wave Technology, LT-1, No. 3, 9/1983, pp. 509-513.

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