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    • 4. 发明专利
    • EQUIPMENT AND METHOD FOR MEASURING RESIDUAL MAGNETIC FIELD OF STRATUM
    • JPH0777581A
    • 1995-03-20
    • JP19755494
    • 1994-07-29
    • COMMISSARIAT ENERGIE ATOMIQUE
    • JIYATSUKU POKASHIYAARUBUERONIKU BARUTO
    • G01R33/02G01R33/025G01V3/26G01V3/40
    • PURPOSE: To quickly judge the causes of attenuation of compound R1 of residual magnetic field, which may be fluctuation of magnetic polarity, decrease of residual magnetization, or by others, by employing a second magnetometer to measure the algebraic sum of the geomagnetic field, the residual magnetic field, and a magnetic field of magnetic susceptibility projected in the different directions from the direction of the geomagnetic field. CONSTITUTION: The algebraic sum of a magnetic field B, the projection component I1 of a magnetic field I of a magnetic susceptibility, and the projection component R1 of the residual magnetic field by a scalar magnetometer 7. The magnetic filed I is at an angle α to the b-axis. Meanwhile, a uniaxial direction magnetometer 8 directly measures the algebraic sum of the projection components (Bp , Lp , R3 ) of the magnetic field B, I, R. A uniaxial direction magnetometer 8' measures the difference. The angle D between the axis b and the axis z is equal to the value of cos[(Bp +Ip + R3 )/(B+I1 +R1 )]. Since the magnetic field B can be measured by a magnetometer 5 and the magnetic field I can be measured by a magnetic susceptibility sensor 11, the component I1 is computed by the axis b and the angle α, the component R1 by subduction, the Ip , Bp by the angle D and the magnetic field I, and finally the component S is computed based on S=(R3 -R1 cosD)/sin D.