[S-TT37] 空中からの地球計測とモニタリング

[STT37-04] ドローン電磁探査システムによる埋設金属物探知および土壌比抵抗マッピング

*光畑 裕司¹、上田 匠²、神村 明哉¹、加藤 晋¹、竹内 厚司¹、東 千加良¹、横田 俊之¹ (1.国立研究開発法人　産業技術総合研究所、2.早稲田大学)

キーワード：電磁探査、ドローン、比抵抗、土壌、金属物

Our drone-borne electromagnetic (EM) survey system consists of a commercial multi-frequency electromagnetic sensor equipped with a GPS receiver, a WiFi serial transceiver, and an ultrasonic distance sensor to measure the height of the EM sensor above the ground surface. The EM sensor is suspended from a drone with ropes. The system has been tested at two experimental sites. The first site consisted of two buried vehicles to simulate a landslide. The second site consisted of wet and dry agricultural fields to test resistivity mapping. In the first test, we used the in-phase component of the measured data to locate the vehicles. The shallower vehicle was identified clearly, while the deeper vehicle was located successfully, albeit less easily. In the second test, the quadrature component was used for one-dimensional inversion. The results showed that the resistivity distributions could be mapped at some depths by using a five-frequency-processed quadrature component, and clearly showed the difference between the wet and dry fields. These results demonstrated the potential of the survey system to search for buried metal objects and for shallow subsurface resistivity mapping over relatively large areas.