Development of a new technique of magnetic survey based on vector field measurement

研制了一种新型仪器--三分量磁通门梯度仪。该仪器可以对地球磁场进行全矢量测量。该梯度仪由两个沿垂直线相距50厘米的三分量磁通门磁力仪组成。磁通门传感器采用坡莫合金制成的环形磁芯。由于环芯不会泄漏磁通，因此可以最大限度地减少相邻传感器之间的干扰。该梯度仪从上面的磁力计输出地球磁场Bx、By和Bz，以及它的梯度dBx、dby和dBz。以1nT为单位的梯度分辨率。地球磁场数据可用作指南针数据。该控制器可以将4.000点的数据记录在存储器中，并通过RS-232C接口将这些SATA发送到计算机。使用该梯度仪进行了大量的野外调查，分别是：江森墓(宫城县)、根市遗址(福岛县)、大本窑遗址(福岛县)、太极窑遗址(群马县)、玉田窑遗址(关马县)、太田窑遗址(千叶县)、石原县(静冈县)、千叶山寺(静冈县)、大本窑遗址(福岛县)、武田窑遗址(关马县)、太田窑遗址(千叶县)、石原县(静冈县)、大本窑遗址(福岛县)、千叶山遗址(千叶县)。第一陵墓(岐阜县)、稻盛和宫陵墓(京都县)、龟山陵墓(大阪县)、Gyoujyazuka陵墓(兵库县)、南海道遗址(兵库县)、东山陵墓(兵库县)、岩山陵墓(福冈县)、斋托巴鲁隧道墓(宫崎县)。通过这些实验，证明了该梯度仪比常规仪器更具实用性，并开发了利用三分量梯度仪进行磁测的程序。

A new instrument, "Three-Component Fluxgate Gradiometer", was Developed. This instrument can make full vector measurements of Earth magnetic field. This gradiometer is composed of two three-component fluxgate magnetometers placed 50cm apart along the vertical line. A ring core made of permalloy is used on the fluxgate sensor. Since the ring core does not leak out magnetic flux, the interference between adjacent sensors can be minimized. This gradiometer outputs the Earth field, Bx, By and Bz from the upper magnetometer, and its gradient dBx, dBy and dBz. The resolution of the gradient in 1nT.The data of the Earth's field can be used as compass data. The controller can record 4.000-point data in the memory and send these sata to a computer through its RS-232C interface.A lot of sxperiments of field survey using this gradiometer were carried out at Ebisu-mori mounded tomb (Miyagi Pref.), Negishi site (Fukushima Pref.), Ooto Kiln site (Fukushima Pref.), Tajiri site (Gun-ma Pref.), Saruta Kiln site (Gun-ma pref.), O-terayama cave (Chiba Pref.), Ishinogata mounded tomb (Shizuoka Pref.), O-chiba pass temple site (Shizuoka Pref.), Zoubisan No.1 mounded tomb (Gifu Pref.), Inarizuka mounded tomb (Kyoto Pref.), Kaibukiyama mounded tomb (Osaka Pref.), Gyoujyazuka mounded tomb (Hyogo Pref.), Nanukaichi site (Hyogo Pref.), Higashiyama mounded tomb (Hyogo Pref.), Iwatoyama mounded tomb (Fukuoka Pref.), tunnel tombs in Saitobaru (Miyazaki Pref.) and so on.Through these experiments, it was proved that this gradiometer was more available than conventional instruments, and the procedure for magnetic survey using the three-component gradiometer has been also developed.