Electricity: measuring and testing – Magnetic – Displacement
Patent
1991-01-22
1992-05-19
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Displacement
32420711, 32420722, 32420724, G01B 714
Patent
active
051151952
ABSTRACT:
A system and method for measuring the absolute position of one body which is constrained to move with respect to another body includes a plurality of magnetic identification units, which are adapted to be mounted in a predetermined absolute position on a first body. Each of the magnetic identification units has an identity characteristic that is associated therewith. A Sensor having a transducer is adapted to be fixed to a second body. The transducer is adapted to sense (a) the relative distance of at least one of the magnetic identification units with respect to a benchmark location which is fixed relative to the transducer and the second body. It is also equipped to sense the identity characteristic of the sensed unit. A controller is provided to receive data representing the relative distance and identity characteristic of the sensed unit from the sensor. The controller identifies the sensed unit from the identity characteristic, recalls the predetermined absolute position of the sensed unit and determines an absolute position for the benchmark location by summing the predetermined absolute position of the sensed unit with the relative distance of the sensed unit to the benchmark position.
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"A CCD Based Linear Absolute Encoder", Sensors, Jun. 1990.
Hellwig Joachim
Heuckelbach Rainer
Peterson Wade D.
MTS Systems Corporation
Snow Walter E.
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