5 October 2009 High speed, high performance, portable, dual-channel, optical fiber Bragg grating (FBG) demodulator
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Proceedings Volume 7503, 20th International Conference on Optical Fibre Sensors; 75034U (2009) https://doi.org/10.1117/12.834219
Event: 20th International Conference on Optical Fibre Sensors, 2009, Edinburgh, United Kingdom
Abstract
A high speed, high performance, portable, dual-channel, optical Fiber Bragg Grating demodulator based on fiber Fabry- Pérot tunable filter (FFP-FT) is reported in this paper. The high speed demodulation can be achieved to detect the dynamical loads of vehicles with speed of 15 mph. However, the drifts of piezoelectric transducer (PZT) in the cavity of FFP-FT dramatically degrade the stability of system. Two schemes are implemented to improve the stability of system. Firstly, a temperature control system is installed to effectively remove the thermal drifts of PZT. Secondly, a scheme of changing the bias voltage of FFP-FT to restrain non-thermal drifts has been realized at lab and will be further developed to an automatic control system based on microcontroller. Although this demodulator is originally used in Weight-In- Motion (WIM) sensing system, it can be extended into other aspects and the schemes presented in this paper will be useful in many applications.
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Hongtao Zhang, Zhanxiong Wei, Lingling Fan, Pengfei Wang, Xilin Zhao, Zhenhua Wang, Shangming Yang, and Hong-Liang Cui "High speed, high performance, portable, dual-channel, optical fiber Bragg grating (FBG) demodulator", Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75034U (5 October 2009); doi: 10.1117/12.834219; https://doi.org/10.1117/12.834219
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