Electricity: measuring and testing – Magnetic – Displacement
Patent
1994-02-16
1995-08-01
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Displacement
92 5R, 32420722, 32420724, 324176, 336 20, 336 45, G01B 714, G01P 350, F01B 2504, H01F 2100
Patent
active
054382610
ABSTRACT:
In one aspect of the present invention, an apparatus for determining an extended length of a hydraulic cylinder is disclosed. A piston and rod are contained within a cylindrical housing of the hydraulic cylinder. A coil is wound about the rod and is attached to the piston and an end of the cylindrical housing. The coil extends and retracts with the reciprocating movement of the piston. An oscillator is coupled to the coil and produces a position signal in response to the inductance of the coil. A circuit receives the position signal, and determines the incremental linear position and velocity of the piston and rod relative to the housing in response to the frequency of the position signal.
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patent: 4577509 (1986-03-01), Moser
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patent: 5233293 (1993-08-01), Huang et al.
Baker Thomas M.
Codina George
Creger Lisa A.
Vachon J. Thomas
Caterpillar Inc.
Masterson David M.
Strecker Gerard R.
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