18. A Differential Proton Magnetometer

概要

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A magnetometer that records differences in total geomagnetic intensity between two points is described. By mixing the signals caused by free precession of protons from the two detecting coils, the beat signal is recorded on a pen-writing oscillograph. According to the test of the apparatus at the Oshima Geophysical Observatory, the accuracy of the differential magnetometer is found to be about 0.2γ/10m at the moment. Since it is easy to increase the distance between the two coils, the sensibility of the apparatus can be increased. The purpose of the present apparatus is to detect very accurately local anomalous changes in the earth's magnetic field which might be accompanied by activities of Volcano Mihara.|プロトン磁力計の2個の検出器からの信号周波数を混合して得られる唸周波数を計数して,2地点の地磁気全磁力の差を0.2γ程度の精度で測定する装置を考案した.この器械は地震研究所伊豆大島観測所に設置され,三原山の火山活動に伴なうと予想される地磁気変動の精密観測に使用される予定である.
1960-07-10