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

Mou, Chengbo, Zhou, Kaiming, Suo, Rui, Zhang, Lin and Bennion, Ian (2009). Fibre laser torsion sensor system using an excessively tilted fibre grating and low-cost time domain demodulation. IN: 20th international conference on optical fibre sensors. Jones, Julian D.C.; Culshaw, Brian; Ecke, Wolfgang; López-Higuera, José M. and Willsch, Reinhardt (eds) SPIE proceedings, 7503 . SPIE.

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°.

Additional Information: 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 (October 05, 2009); doi:10.1117/12.833595; http://dx.doi.org/10.1117/12.833595. Copyright 2009 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. http://dx.doi.org/10.1117/12.833595
Event Title: 20th International Conference on Optical Fibre Sensors
Event Type: Other
Event Location: Edinburgh
Event Dates: 2009-10-05 - 2009-10-09
Uncontrolled Keywords: torsion sensor, fibre laser, tilted fibre grating, photonics, Computer Science Applications, Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Applied Mathematics, Condensed Matter Physics
ISBN: 978-0-8194-7814-6
Published Date: 2009-10-05
Authors: Mou, Chengbo
Zhou, Kaiming
Suo, Rui
Zhang, Lin
Bennion, Ian

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