29 August 2013 The performance analysis of the optical frequency domain reflectometry fiber grating strain sensor system
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Proceedings Volume 8914, International Symposium on Photoelectronic Detection and Imaging 2013: Fiber Optic Sensors and Optical Coherence Tomography; 891404 (2013) https://doi.org/10.1117/12.2030825
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China
Abstract
A quasi-distributed sensor system based on optical frequency domain reflectometry where the sensing points were identical, low-reflective fiber gratings in a single fiber was investigated. Firstly, the spatial distribution function of fiber gratings was deduced in theory, and the effects of interference among each sensing fiber grating and between the gratings with broadband reflector were investigated. Then the strain sensor system cascaded 215 fibers Bragg gratings (FBGs) in a single fiber had been numerical investigated, the spatial domain addressing and wavelength demodulation of the fiber gratings was implemented according to Fourier transform and inverse Fourier transform. Finally, the internal relations between interaction noise and distribution position of the gratings were simulation analysis. The results show that the interference exists among each sensing fiber grating,but it can be suppressed by buffer fiber. This allows obtaining more realistic values of the performance and design parameters such as the number of FBGs, the reflectivity of the gratings, and the distance between the sensors.
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Zhaoyun Li, Bo Qin, Zhiqiang Liu, Guo-feng Wu, Su Li, Peng-fei Liu, Xin Zhang, "The performance analysis of the optical frequency domain reflectometry fiber grating strain sensor system", Proc. SPIE 8914, International Symposium on Photoelectronic Detection and Imaging 2013: Fiber Optic Sensors and Optical Coherence Tomography, 891404 (29 August 2013); doi: 10.1117/12.2030825; https://doi.org/10.1117/12.2030825
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