FIELD: magnetometry. SUBSTANCE: gradiometer comprises two identical parallel loops 1 and 2 having area S and twisted together, magnetometer loop 4 of area ΔS which is connected in loop 1, squid 5 interconnected between loops 1 and 2 in the gradiometer circuit. EFFECT: enhanced reliability in astaticism of gradiometer due to geomagnetic field inhomogeneity influence excluded. 3 dwg
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