Continuous real time nulling gradiometer for single and multicom

Details Continuous real time nulling gradiometer for single and multicom Continuous real time nulling gradiometer for single and multicom

1989-03-20

1990-03-06

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetometers

324260, 350 9629, 25022719, 356345, G01R 33022, G01R 33023, G01B 902

Patent

active

049069292

ABSTRACT:
A fiber-optic magnetic field gradiometer uses a plurality of magnetic transducers to simultaneously determine multicomponents of the gradient and field strength of an external magnetic field so as to permit accurate determination of the location of a ferromagnetic object located in an array of objects. The magnetic transducers are made of several layers of magnetostrictive glass which 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. The nulling technique may be accomplished in real time and does not require cutting off the drive signals to adjacent coils. Thus the nulling may be accomplished simultaneously for all coils as the balancing of each coil is independent of its neighbors. A magnetic field to be detected along the axes of the magnetic transducers causes an optical path length change in the fibers. By employing eight magnetic transducers, all gradients and fields may be determined at the same time. Further by employing additional transducers, for a total of thirteen, the second derivatives of the fields may also be determined.

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