From Event: SPIE Commercial + Scientific Sensing and Imaging, 2018
Raman-based distributed temperature sensing (DTS) systems have found widely ranging commercial applications. For extended distance DTS measurement the spatial resolution is sometimes limited through pulse broadening caused by the intermodal dispersion of graded index multimode (GIMM) optical fiber. In this paper we describe the design, manufacturing and performance of a high bandwidth GIMM fiber, with bandwidth optimized at 1550 nm. Using this fiber, we demonstrate distributed temperature measurement with an extended distance of 32 km and spatial resolution of 3 meters. In comparison, the spatial resolution of an OM4 (bandwidth optimized for use at 850 nm) fiber typically used in temperature sensing over 32km is more than 10 meters.
Xiaoguang Sun, Kyle Bedard, David Braganza, Mei Wen, Jie Li, and Mike Hines, "Long distance, high spatial resolution distributed temperature measurement using a graded index optical fiber at 1550 nm ," Proc. SPIE 10654, Fiber Optic Sensors and Applications XV, 1065412 (Presented at SPIE Commercial + Scientific Sensing and Imaging: April 19, 2018; Published: 14 May 2018); https://doi.org/10.1117/12.2303425.
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