Magnetic Encoding Technology | SRI International

Toggle Menu

Magnetic Encoding Technology

Control of equipment and machinery depends in part upon sensing the movement and location of components within it. Until recently, there has not been a reliable, accurate, and inexpensive means to sense the motion and location of machine components such as hydraulic cylinders. To meet this need, SRI has developed a novel technology, available for license.

Rather than exploit optical devices or precise, but costly, mechanical schemes, SRI researchers have determined the feasibility of applying a ferromagnetic (magnetizable) alloy to a typical hydraulic cylinder rod. In this method, the cylinder rod can be encoded in a manner similar to a magnetic tape or a hard disk, in any desired pattern.

SRI has developed, tested, and fielded systems with an alloy electroplated on a standard steel cylinder rod. This alloy is encoded and can be read by very small, widely available magnetic read sensors. SRI created special-purpose perpendicular write heads, circuitry, and algorithms to decode signals for a great variety of applications, and has adapted alloys to nearly any substrate, whether conductive or not.

SRI has a portfolio of issued patents for the technology, and we continue to develop it for other sensing applications.

Key Features
  • Linear resolutions of a half-millimeter, with much greater resolution expected in the near future
  • Absolute and relative position
  • Resistance to severe environmental conditions that are encountered by heavy machinery
  • Orders of magnitude less expensive than competing technologies
  • Several application methods, including electroplating, sputtering, and chemical vapor deposition
  • Usability for rotary motion, acceleration, and torsion sensing, such as for dynamometers and wind generators

Accelerate your roadmap with unparalleled technology for license opportunities.

Horizontal Tabs

Public Sector
Commercial
Education

*Required field