Development of airborne transient electromagnetics system using Drone : D-GREATEM, D-TEM[GLS], D-TEM[ALS]

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  • ドローンを用いた過渡応答空中電磁探査装置の開発 － D-GREATEM,D-TEM[GLS],D-TEM[ALS] －
  • ドローン オ モチイタ カト オウトウ クウチュウ デンジ タンサ ソウチ ノ カイハツ : D-GREATEM, D-TEM [GLS], D-TEM [ALS]

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Abstract

<p>Airborne electromagnetic (AEM) exploration system is one of innovative technologies to visualize underground structure by flight. Conventional AEM systems require a helicopter in order to load large and heavy equipment. Therefore, those systems are not applicable to an investigation of small areas, because of excessive running cost including flight permissions, and risk assessment and management. In recent years, drones (multicopters) have been applied in various fields and the performance of drones has been improved. Present study has developed an AEM using a drone instead of a helicopter. The key point for development was the weight saving of equipment loaded on the drone. Three types of AEM systems have been developed in order to apply them depending on the survey depth and/or the condition of the survey site. The D-GREATEM system is appropriate for linear area survey and requires a grounded wire source. The D-TEM [GLS] system is appropriate for wide area survey and also requires a grounded wire source. The D-TEM [ALS] system, using two drones, does not require a grounded wire source. Test flights showed that resistivity cross-sections obtained from the drone-AEM systems is consistent with those from conventional electrical prospecting. The D-GREATEM and D-TEM [GLS] systems were found to have a relatively deep depth of investigation (more than 100 m), compared to D-TEM [ALS] system. Nevertheless, the D-TEM [ALS] system is effectively applicable to an area where the grounded wire source is not allowed by the conditions of the survey area. These three methods can be used to survey narrower areas and shallower geological structures with higher spatial resolution, compared to a conventional helicopter AEM system. Eventually, those techniques would allow us efficient and cost-effective surveys.</p>

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