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. Copyright © 1978 by The Institute of Electrical and Electronics Engineers. Inc.
S. V. Marshall, "Vehicle Detection Using A Magnetic Field Sensor," IEEE Transactions on Vehicular Technology, vol. 27, no. 2, pp. 65 - 68, Institute of Electrical and Electronics Engineers, Jan 1978.
The definitive version is available at https://doi.org/10.1109/T-VT.1978.23725
Electrical and Computer Engineering
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01 Jan 1978