Strain gauge

US4782705A · kind A · utility

Assignee

• Alcatel N.V. · NL

Inventors

• Horst Hoffmann · Pentling, DE
• Peter Kersten · Leonberg, DE
• Hans Volz · Schwieberdingen, DE
• Ulrich Seyfried · Stuttgart, DE

Key dates

• Filing date: Jul 10, 1987
• Grant date: Nov 8, 1988
• Expiry date: Jul 10, 2007

Classification

• Technology area (CPC G): Physics
• CPC primary: G01L1/125
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A strain gauge comprised of a premagnetized ferromagnetic film wherein any change in length of the film is converted into a planar Hall voltage by employing the property of magnetostriction and the planar Hall effect. Alternately, a change in the length of the film can also be measured as a change in electric conductivity by employing the properties of magnetostriction and magnetoresistance. The strain gauge is deposited on a substrate by thin-film techniques and has a very high sensitivity.