Linear position sensor with equalizing means

Reference Number: N 01-03

Inventors: Morgan Denny E.

Owner: NISTAC

USPTO Link:5182979

Invention Summary

In one aspect of the present invention, an apparatus for detecting a linear position of a piston and a piston rod is provided. The piston and piston rod are movable within a housing of a hydraulic cylinder. The apparatus delivers an electromagnetic signal into the hydraulic cylinder and senses an electromagnetic wave signal within the hydraulic cylinder, equalizes the received electromagnetic signal, and compares the equalized electromagnetic wave signal with a predetermined constant. The apparatus determines the linear extension of the cylinder as a function of the frequency signal.