Patent · US Active

Laser sensor apparatus and method for detecting transmission shaft torque

US7586083B2 · kind B2 · utility

7Cited by
9References
12Claims
0Family size

Assignee

Inventors

Key dates

Filing dateDec 7, 2007
Grant dateSep 8, 2009
Priority date—
Expiry dateDec 7, 2027

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG01L3/12
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

Presented herein is a non-contact torque sensing apparatus and method for measuring the instantaneous torque, or torsional stress/strain, transmitted through an elongated power transmission member such as a rotatable shaft. Polarized light is directed along a measurement light path in a cavity of a shaft where it intercepts a polarizing filter. The polarizing filter is operable to alter the polarization angle of the light according to torsional twisting of the shaft. A measurement device measures the change in the polarization angle of the light to obtain the shaft twist angle. Shaft torque is then calculated from the twist angle.

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