Patent · US Active

Position sensing of a piston in a hydraulic cylinder using a photo image sensor

US8482607B2 · kind B2 · utility

3Cited by

25References

20Claims

0Family size

Inventors

Timothy Webster · Vancouver, CA
Ashu M. G. Solo · Saskatoon, CA
Qing Wu · Jiangyin, CN
Wen Jun Yang · Vancouver, CA

Key dates

Filing date	Jun 24, 2008
Grant date	Jul 9, 2013
Priority date	—
Expiry date	Oct 7, 2029

Classification

Technology area (CPC G)Physics
CPC primaryG01D5/34746
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

Described is a device and method of measuring the linear position of a piston 002 movable within a hydraulic or pneumatic cylinder barrel 001. The measuring device includes a photo optical sensing apparatus 011 mounted at the cylinder head. The photo optical sensing apparatus 011 can be located inside or outside of the cylinder 001. The sensing apparatus 011 design utilizes a typical optical sensing apparatus, and optional functional modules for determining absolute displacement, and communication. Calibration locations, which are used to obtain absolute displacement measurements, are determined by calibration images or separate sensors indicating their presence.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.