Fibre laser torsion sensor system using an excessively tilted fibre grating and low-cost time domain demodulation

Chengbo Mou; Kaiming Zhou; Rui Suo; Lin Zhang; Ian Bennion

doi:10.1117/12.833595

5 October 2009 Fibre laser torsion sensor system using an excessively tilted fibre grating and low-cost time domain demodulation

Chengbo Mou, Kaiming Zhou, Rui Suo, Lin Zhang, Ian Bennion

Author Affiliations +

Proceedings Volume 7503, 20th International Conference on Optical Fibre Sensors; 75033E (2009) https://doi.org/10.1117/12.833595
Event: 20th International Conference on Optical Fibre Sensors, 2009, Edinburgh, United Kingdom

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°.

Citation Download Citation

Chengbo Mou, Kaiming Zhou, Rui Suo, Lin Zhang, and Ian Bennion "Fibre laser torsion sensor system using an excessively tilted fibre grating and low-cost time domain demodulation", Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75033E (5 October 2009); https://doi.org/10.1117/12.833595

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