Magnetic field gradiometers

Details Magnetic field gradiometers Magnetic field gradiometers

G - Physics

01

R

324/57

G01R 33/022 (2006.01) G01R 33/035 (2006.01)

Patent

CA 1188737

ABSTRACT OF THE DISCLOSURE A magnetic field gradiometer includes a pair of coils, encompassing different regions of space. A SQUID is provided to detect a difference in flux linking the coils thereby to provide a measure of a magnetic field gradient between the coils. A control element of a superconducting material is provided in the vicinity of the coils and a heater is controlled to vary the proportion of the element assuming the superconducting state. By suitably varying this proportion the balance condition of the coils can be altered. The control element may operate in a feed back circuit. A coil subjects both coils to an alternating magnetic field at a preset frequency. A component in the output of the SQUID having this frequency is used to control the heater.

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