Geotech Aerolevantamento

Introduction Geotech has conducted airborne electromagnetic geophysical surveys for more than two decades using their proprietary technology and has a long history of notable innovations. During the mid 1990's Geotech introduced the world's first helicopter-borne, multi-frequency, all-digital frequency-domain electromagnetic system; the Hummingbird HEM. This system is still in use for specialized applications and by many government organizations around the world. Many successful surveys were flown with the Hummingbird system from the deserts of Arabia to the ice floes of the Arctic. In the late 1990s, Geotech developed a multi-frequency, wing-tip mounted EM system, designated HAWK. Despite very encouraging flight tests, development of the system was discontinued when the main financial-backer was purchased by a much larger airborne surveying company. In 2001, Geotech began development a commercially viable AFMAG (Audio-Frequency Magnetics) system. Successful airborne tests have been conducted and Geotech is examining various options to develop the market potential of the system. In late 2002, Geotech successfully completed field-testing of the VTEM (Versatile Time-Domain ElectroMagnetics) system. The VTEM system rapidly proved itself with depth penetration of over 300 metres, even in conductive terrain. This is due to its low operating frequency and large dipole-moment. As VTEM is a helicopter-borne system, it can be used in rugged topography with the resulting data having excellent spatial resolution. During the past four years, Geotech has been offering full-service airborne geophysical surveys with its proprietary VTEM system. To date, surveys have been conducted on four continents in a variety of climatic conditions ranging from arctic to tropical. All data processing is performed in-house using proprietary and commercial software to quickly produce the final data required by its customers.