Dual Sensor “Alis” for Humanitarian Demining

We introduce the development and deployment of ALIS for Humanitarian Demining. ALIS is a dual sensor, which combines EMI (Electromagnetic Induction) sensor and GPR (Ground Penetrating Radar). This is a hand held sensor, equipped with position tracking system, then ALIS can acquire the EMI and GPR signal together with its position information, while it is scanned on the ground surface by an operator by hand manually. Therefore, the data can be processed using Synthetic Aperture Radar (SAR) processing (migration) and can reconstruct 3-D subsurface image. GPR of ALIS operates at 1-3GHz, and the penetration depth of the GPR is 20- 50cm. By deploying the ALIS in Cambodia since 2009, we found that ALIS is capable for imaging buried mines, and can reduce the false alarm ratio drastically. We have detected more than 80 buried land mines in Cambodia mine fields. In 2017 we completed the advanced ALIS system, which is compact and light weight which is less than 3.1 kg.