A High Speed Towed Magnetic Array for In-Road Detection of Improvised Explosive Devices Employing Optimized Magnetic Map Differencing
Small Business Information
605 Mercury Street, Raleigh, NC, 27603
AbstractThis proposal describes an active electromagnetic induction (EMI) sensor array that can operate at a sampling rate of 750Hz, corresponding to 1.4 inches (3.5 cm) in distance at a moving speed of 60 mph. At low frequencies (below a few kHz), an EMI sensor is basically a magnetometer that responds to susceptibility targets (i.e., ferrous objects). The main difference is that, while a magnetometer uses the earth's field as the illuminating source, an EM sensor emits its own time-varying magnetic field and, thus, has the name electro-magnetometer. An electro-magnetometer acts like a magnetometer at low frequencies but also acts like a metal detector at higher frequencies, responding to conductive targets and, therefore, can also detect nonferrous objects (aluminum, copper, brass, etc.) that a magnetometer misses. The proposed electro-magnetometer will have a bandwidth of 750 Hz - 96 kHz, for which it will behave like a magnetometer below a few kHz and a metal detector above. In this proposal, we describe our new electro-magnetometer technology that can meet all requirements for this topic: it will provide a high sampling rate (750 Hz), can have an arbitrarily wide swath, and can detect both ferrous and nonferrous targets down to 3 feet in depth for typical metal objects. The proposed sensor is based on successful commercial EMI sensors manufactured by Geophex for detecting and discriminating UXO/landmines. The primary difference will be the new high sampling rate to meet the requirements of this SBIR topic.
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