Electricity: measuring and testing – Magnetic – Displacement
Patent
1989-04-10
1990-03-27
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Magnetic
Displacement
336 30, 34087031, G01B 714, H01F 2102, H01Q 700
Patent
active
049124099
ABSTRACT:
A linear displacement transducer has an elongated current conducting, tubular coil which is mounted to an end cap in a hydraulic or pneumatic cylinder and extends into a hole bored in the piston/piston rod unit within the cylinder. An electrically conducting, nonferromagnetic tube lines the wall of the bore and reciprocates axially with the piston/piston rod unit varying its overlap of the coil and thereby varying the inductance of the coil at an applied frequency. An AC electrical energy source is connected to apply an AC signal to the coil, the frequency of this signal being at least high enough that the skin depth in the tubular wall is less than the physical depth of the tubular wall. A detector circuit means is connected to the coil for detecting a signal which is proportional to the coil inductance and therefore is proportional to the displacement of the piston/piston rod unit within the cylinder.
REFERENCES:
patent: 3001183 (1961-09-01), McKenney et al.
patent: 3654549 (1972-04-01), Maurer et al.
patent: 4406999 (1983-09-01), Ward
patent: 4502006 (1985-02-01), Goodwin et al.
Redlich Robert W.
Scheck Christopher G.
Eisenzopf Reinhard J.
Foster Frank H.
Snow Walter E.
Sunpower, Inc.
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