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Vehicle detection using a magnetic field sensor

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1 Author(s)
Marshall, S. ; University of Missouri-Rolla, Rolla, MO

The measurement of vehicle magnetic moments and the results from use of a fluxgate magnetic sensor to actuate a lighting system from the magnetic fields of passing vehicles is reported. A typical U.S. automobile has a magnetic moment of about 200 A-m2(Ampere-meters2), while for a school bus it is about 2000 A-m2. When the vehicle is modeled as an ideal magnetic dipole with a moment of 200 A-m2, the predicted results from an analysis of the sensor-vehicle geometry agree closely with observations of the system response to automobiles.

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Vehicular Technology, IEEE Transactions on  (Volume:27 ,  Issue: 2 )