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Journal of Sensors and Sensor Systems An open-access peer-reviewed journal
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Volume 6, issue 2
J. Sens. Sens. Syst., 6, 253–258, 2017
https://doi.org/10.5194/jsss-6-253-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
J. Sens. Sens. Syst., 6, 253–258, 2017
https://doi.org/10.5194/jsss-6-253-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular research article 14 Jul 2017

Regular research article | 14 Jul 2017

Development of a non-contact torque transducer based on the laser speckle contrast method

Alberto Garinei1 and Roberto Marsili2 Alberto Garinei and Roberto Marsili
  • 1DMII Department, Università degli Studi Guglielmo Marconi, 00193 Rome, Italy
  • 2Dipartimento di Ingegneria, Università degli Studi di Perugia, Via Duranti, no. 1, 06125 Perugia, Italy

Abstract. When a torque measurement is required, torque transducers show many drawbacks during their use: the usual limits are the need for contact and the effects on shaft line parameters. A new approach is proposed in this work: a non-contact torque meter for a machine shaft has been developed. It carries out torque measurements evaluating the torsional displacement between two distinct sections of the shaft, through the monitoring of their roughness.

The sensing principle employed is the classical laser speckle contrast method. The outcoming intensity scattered by the rough surface is processed by a cross-correlation function. In this way, the angular torsion of two distinct sections is obtained. It is therefore possible to point out the applied torque knowing the shaft torsional stiffness.

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When a torque measurement is required, torque transducers show many drawbacks during their use: the usual limits are the need for contact and the effects on shaft line parameters. A new approach is proposed in this work: a non-contact torque meter for a machine shaft has been developed, based on a laser speckle contrast method. It carries out torque measurements evaluating the torsional displacement between two distinct sections of the shaft, through the monitoring of their roughness.
When a torque measurement is required, torque transducers show many drawbacks during their use:...
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