Hydraulic cylinder end member arrangement for a piston position

Details Hydraulic cylinder end member arrangement for a piston position Hydraulic cylinder end member arrangement for a piston position

1997-02-14

1999-01-05

Do, Diep N.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Distributive type parameters

324633, 91 1, 92 5R, G01R 3332, G01R 2732

Patent

active

058567453

ABSTRACT:
A piston position sensing system with improved accuracy and reliability is achieved by electromagnetic wave coupling using the combination of: a mechanical structure that in addition to supporting the rod, provides an extension of the resonance cavity, supports the electromagnetic wave couplers and a hydraulic fluid input-output port into the extended cavity and a piston travel stop; an electronic circuitry shielded package having a high frequency section with coaxial shielded input and output conductors on opposing package sides and a lower frequency counting section having a piston position output shielded conductor and a fluid dielectric property change monitor input conductor separated from the high frequency section conductors; and, the positioning of the electronic package on the mechanical structure with the coaxial shielded input and output conductors respectively adjacent to the input and output couplers and with the hydraulic fluid input-output port positioned elsewhere around the periphery of the cylinder. The structure assures minimal high frequency conductor length, with electrical and physical damage.

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