Electricity: measuring and testing – Magnetic – Calibration
Patent
1991-04-09
1994-08-30
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Calibration
180168, 318587, 3242072, 324228, 324235, 324251, G01R 3500, G01R 3306, G05D 300
Patent
active
053431456
ABSTRACT:
The operational fitness of a magnetic sensor for detecting buried magnets can be tested from time to time by an electromagnet installed in proximity to the sensor. The electromagnet is a small coil of wire mounted near the sensor, such as a Hall effect device, which when energized, generates a test magnetic field. The analog output of the sensor is compared with preestablished values when the electromagnet is energized to verify the proper operation of the sensor; it is also compared with preestablished values when sensing buried magnets to confirm operation of the sensor, the strength of the buried magnet, and the alignment of the sensor with respect to the magnet. A threshold detector senses the output of the sensor to indicate when a magnetic field is detected, and the peak analog output of the sensor is stored and compared to a reference after the sensor passes the magnet. The sensors are normally tested whenever the vehicle is initially powered up or after the vehicle has been stopped for a predetermined time.
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Conley, III Walter
Dammeyer Ned E.
Wellman Timothy A.
Crown Equipment Corporation
Strecker Gerard R.
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