Magnetically triggered elapsed time indicator

Details Magnetically triggered elapsed time indicator Magnetically triggered elapsed time indicator

1993-10-01

1996-02-13

Coles, Sr., Edward L.

Communications: electrical

Vehicle detectors

340984, 340323R, G08G 101, G08B 2300

Patent

active

054914760

ABSTRACT:
Apparatus for determining when a moving vehicle passes a fixed point characterized by a magnetic field. The apparatus includes first and second magnetic-field sensors spaced apart on the vehicle for producing first and second outputs when the sensors move in the magnetic field past the point. The outputs are validated based on the time span between the outputs and the spacing between the sensors. According to certain more specific features, the fixed point is a magnetic buoy, the vehicle is a boat expected to move past the buoy at a speed within an acceptable range, the first and second magnetic-field sensors are electrical coils spaced apart a known distance in the direction of movement, and the validating means uses the sensor spacing and the acceptable range for validating the outputs. According to other features, the elapsed time for the vehicle to travel between two fixed points is determined using only validated outputs. Measurement of elapsed time is initiated when a first set of acceptable outputs is identified and terminated when a second set of acceptable outputs is identified. A predetermined lower limit of the elapsed time is used to reject any outputs that occur before the lower limit, and a predetermined upper limit of elapsed time is used to terminate and reset the timer.

REFERENCES:
patent: 3127768 (1964-04-01), Mason
patent: 3497770 (1970-02-01), Nellis
patent: 3546696 (1970-12-01), Waters et al.
patent: 4392122 (1983-07-01), Hocken

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