Signal improvement in the sensing of hydraulic cylinder piston position using electromagnetic waves
US5617034A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 9, 1995 |
| Grant date | Apr 1, 1997 |
| Priority date | — |
| Expiry date | May 9, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/48
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.