17 October 2012 High-spatial-resolution distributed vibration measurement using time-resolved optical frequency-domain reflectometry
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Proceedings Volume 8421, OFS2012 22nd International Conference on Optical Fiber Sensors; 842115 (2012) https://doi.org/10.1117/12.974691
Event: OFS2012 22nd International Conference on Optical Fiber Sensor, 2012, Beijing, China
Abstract
A high-spatial-resolution distributed optical fiber vibration sensor is demonstrated. The distributed dynamic strain or vibration information can be obtained using time-resolved optical frequency-domain reflectometry (OFDR). Time-domain information is resolved by measuring Rayleigh backscatter spectrum in different wavelength ranges which fall in successive time sequence due to the linear wavelength sweep of the tunable laser source with a constant sweeping rate. This time-resolved local Rayleigh backscatter spectrum shift of the vibrated state with respect to that of the non-vibrated state along the fiber length provides dynamic strain information in a distributed manner. The measurable frequency range of 0-32 Hz with the spatial resolution of 10 cm can be achieved
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Da-Peng Zhou, Zengguang Qin, Wenhai Li, Liang Chen, Xiaoyi Bao, "High-spatial-resolution distributed vibration measurement using time-resolved optical frequency-domain reflectometry", Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 842115 (17 October 2012); doi: 10.1117/12.974691; https://doi.org/10.1117/12.974691
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