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Institute for Commercialization

Signal improvement in the sensing of hydraulic cylinder piston position using electromagnetic waves

Reference Number: N 01-03

Inventors: Lark, Wayne W.; Morgan, Denny; Turba, James R.

Owner: NISTAC

USPTO Link:5617034

Invention Summary

Improvement of the ability to detect selected resonant frequencies associated with the position of the piston in a piston position sensing system using electromagnetic waves in the fluid in a hydraulic cylinder is achieved by positioning the electric signal input and output probes with 90 degree separation around the circumferential periphery of the cylinder to suppress coupling into unwanted modes that diminish detectability of particular resonant frequency signals, In a coaxial sensing system "dummy" probes at 90 degree separation to each other and 90 degree separation to the input and output probes operate to improve symmetry and resonance shape and to suppress unwanted modes.