23 April 2017 Interrogation system with auto-calibration for fiber Bragg grating sensors using VCSEL based optical frequency comb generators
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Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103231F (2017) https://doi.org/10.1117/12.2265849
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of
Abstract
A new instrumentation system for FBG interrogation is proposed. It combines the use of a VCSEL as a tunable laser and an optical frequency comb generator as a selective broadband source. Features such as auto-calibration and wave-length tracking are provided with this interrogation system. First a fast sweep searches for the FBG spectral position, its reflection profile and finds the best set of operating points for the optical comb. Then, the VCSEL is tuned with the FBG through a feedback loop to withstand large-range slow changes (strain and temperature) and, at the same time, the faster phenomena (vibrations and ultrasounds) are measured by the optical frequency comb generator. In practice, a dual comb is proposed to interrogate actively the FBG reflection in order to obtain radio frequency signals that contain the FBG dynamic-strain due to applied vibrations.
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D. A. Poiana, J. A. Garcia-Souto, J. E. Posada-Román, P. Acedo, "Interrogation system with auto-calibration for fiber Bragg grating sensors using VCSEL based optical frequency comb generators ", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103231F (23 April 2017); doi: 10.1117/12.2265849; https://doi.org/10.1117/12.2265849
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