Fluxgate Based Detection of Magnetic Material in Soil Subsurface

Indrasari, Widyaningrum and Djamal, Mitra and Srigutomo, Wahyu and Handayani, Gunawan and Hadziqoh, Nur and Ramli, Ramli (2015) Fluxgate Based Detection of Magnetic Material in Soil Subsurface. Applied Mechanics and Materials, 771. pp. 55-58. ISSN 1662-7482

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Abstract

The aim of this work is to develop a new tool for detection of magnetic material in soil subsurface based on fluxgate sensors. The fluxgate element consists of two pick-up coils, four excitation coils, and the ferromagnetic core. The fluxgate sensor was characterized using a calibrator serving as an external magnetic field source. In this paper we report the influence of the frequency of the primary magnetic field of the solenoid on the sensor response, the influence of soil magnetic susceptibility, and the effect of the presence of magnetic material in the soil subsurface to the sensor response. Capability of the sensor to detect magnetic properties of a material in soil subsurface was observed by placing a magnetic material sample below the soil surface. An AC magnetic field with specific frequency was applied to the material, and the response of the material to AC magnetic field was then detected using the fluxgate sensor in the direction of the x, y and z (3-dimension). We found that change in frequency of the AC current will change the frequency of the AC magnetic field in the solenoid, thus the frequency of the output voltage of the sensor also change. We also found that the sensor output for the agricultural soil is higher than the sensor output for sand soil. The detection system reported here is potential candidate for detection of magnetic material in soil subsurface with low cost.

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