G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 27/72 (2006.01) G08G 1/042 (2006.01)
Patent
CA 2069525
VEHICLE DETECTOR WITH POWER MAIN NOISE COMPENSATION ABSTRACT OF THE DISCLOSURE A vehicle detector includes an inductive sensor which is driven by an oscillator to produce an oscillator signal having a frequency which is a function of inductance of the inductive sensor. The presence of a vehicle is detected when the measured frequency of the oscillator signal changes by more than a threshold value. The effects of magnetic flux produced by adjacent power lines are compensated for by means for measuring the frequency of the oscillator signal during a plurality of sample periods and for characterizing fluctuations of the measured frequency as a function of phase of a power main signal. During a normal measurement period, the frequency of the oscillator signal is measured, and the phase of the power main signal during the measurement period is determined. An output signal is produced by means based upon the measured frequency, the phase, and the known fluctuation of measured frequency as a function of phase of the power main signal.
Hamer Steven M.
Hoekman Earl B.
Minnesota Mining And Manufacturing Company
Smart & Biggar
LandOfFree
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