Temperature-compensated strain gauge measurements

US11287347B2 · kind B2 · utility

Assignee

• ABB Schweiz AG · CH

Inventors

• Paul Szasz · Heidelberg, DE
• Andreas Decker · Besigheim, DE

Key dates

• Filing date: Jul 29, 2020
• Grant date: Mar 29, 2022
• Expiry date: Sep 25, 2040

Classification

• Technology area (CPC G): Physics
• CPC primary: G01L25/00
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A device for measuring a strain of an object independently of temperature variations includes: at least one strain gauge that is attachable directly or indirectly to the object whose strain is to be measured; a first temperature sensor for measuring a temperature of the at least one strain gauge; read-out electronics for measuring a change of electrical resistance of the at least one strain gauge as a measured electrical resistance change, the read-out electronics including at least one fixed resistor whose value is relied upon when obtaining a value of the change of electrical resistance of the strain gauge as a result of the measurement, the read-out electronics being such that a temperature of the at least one fixed resistor is known and/or obtainable by measurement; and an evaluation unit for: correcting the measured electrical resistance change, and/or a strain of the strain gauge and/or the strain of the object.