Metal detecting robotic vehicle
Keywords:
metal detector, sensitivity, geometry, depth, square planar spiral coil, robotic vehicle, ferrous, range, magnetic fieldAbstract
Today’s need for workers in mines is to detect the metals in the path. The previously used metal detector uses BFO (Beat Frequency Oscillation) and RFO (Resonant Frequency Oscillation) techniques which has a drawback of frequency instability. The depth further can be increased by Pulse Induction Method. It uses a single coil as both transmitter and receiver. When current is sent through the coil each pulse generates a magnetic field. When the pulse ends it reflects and it is called the reflected pulse. An electrical spark is generated when both the pulses collapse. Now when a metal comes in the range of the magnetic field, there is a change in the amplitude and phase of the pulse in the received coil. Planar square spiral coil is the geometry best suited for increasing depth sensitivity. It depends on the parameters such as fill ratio and spacing to width ratio. A coil with a higher fill ratio is shown to have higher size sensitivity and a coil with a smaller wire spacing-to-width ratio is shown to have higher depth sensitivity. Using this Pulse Induction Metal Detector we build a robotic vehicle.
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