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Proceedings Paper

Fibre laser torsion sensor system using an excessively tilted fibre grating and low-cost time domain demodulation
Author(s): Chengbo Mou; Kaiming Zhou; Rui Suo; Lin Zhang; Ian Bennion
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Paper Abstract

In this paper, we report a simple fibre laser torsion sensor system using an intracavity tilted fibre grating as a torsion encoded loss filter. When the grating is subjected to twist, it induces loss to the cavity, thus affecting the laser oscillation build-up time. By measuring the build-up time, both twist direction and angle on the grating can be monitored. Using a low-cost photodiode and a two-channel digital oscilloscope, we have characterised the torsion sensing capability of this fibre laser system and obtained a torsion sensitivity of ~412μs/(rad/m) in the dynamic range from -150° to +150°.

Paper Details

Date Published: 5 October 2009
PDF: 4 pages
Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75033E (5 October 2009); doi: 10.1117/12.833595
Show Author Affiliations
Chengbo Mou, Aston Univ. (United Kingdom)
Kaiming Zhou, Aston Univ. (United Kingdom)
Rui Suo, Aston Univ. (United Kingdom)
Lin Zhang, Aston Univ. (United Kingdom)
Ian Bennion, Aston Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 7503:
20th International Conference on Optical Fibre Sensors
Julian D. C. Jones, Editor(s)

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