Superconducting gradiometer-magnetometer array for magnetotellur

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – By magnetic means

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324248, 324350, G01V 326, G01R 33035

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043497810

ABSTRACT:
A subsurface electromagnetic sensing device for use in boreholes and mine shafts which includes a sonde for lowering underground which is supercooled and contains Squid gradiometers for measuring vector current density, and magnetometers for measuring vector magnetic fields. When these measured values are combined, information is obtained to construct a conductivity model of the underlying and surrounding subsurface region.

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patent: 3829768 (1974-08-01), Nicol et al.
patent: 3982176 (1976-09-01), Meador
patent: 3993944 (1976-11-01), Meador et al.
Fraser-Smith, A.C., "Geophys. App. of Superconducting . . . Gradiometers" Geophysics, vol. 41, No. 2, Apr. 1976.
Wynn et al., "Advanced Superconducting Gradiometer/Magnetometer Arrays . . . ", IEEE Trans. on Magnetics, vol. MAG-11, No. 2, Mar. 1975, pp. 701-707.
Vozoff, Keeva, The Magnetotelluric Method in the Exploration of Sedimentary Basins, Geophysics, vol. 37, No. 1, Feb. 1972, pp. 98-141.

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