{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T16:43:06Z","timestamp":1760114586094,"version":"build-2065373602"},"reference-count":27,"publisher":"MDPI AG","issue":"18","license":[{"start":{"date-parts":[[2024,9,18]],"date-time":"2024-09-18T00:00:00Z","timestamp":1726617600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"National Natural Science Foundation of China","award":["62205105","62171185","52177141"],"award-info":[{"award-number":["62205105","62171185","52177141"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>To address the issue of spatial resolution limitations in traditional Brillouin optical time-domain analysis systems due to phonon lifetime constraints, we employed pre-pumped pulse technology. Additionally, to mitigate the double-peak phenomenon observed in pre-pumped Brillouin optical time-domain analysis systems, we implemented a two-sided band interference method to reduce the linewidth of the double-peak fitting. We conducted bending measurements on three eccentric cores and intermediate cores spaced 120\u00b0 apart. Our results demonstrate that the system described in this paper can achieve a spatial resolution of 30 cm, with bimodal linewidths of 23.1 MHz and 16.0 MHz. Using the parallel transmission frame algorithm, we determined the curvature of a seven-core fiber with a curvature diameter of approximately 10 cm to be 20.67 m\u22121, with an error margin of 3.2%.<\/jats:p>","DOI":"10.3390\/s24186023","type":"journal-article","created":{"date-parts":[[2024,9,18]],"date-time":"2024-09-18T09:49:19Z","timestamp":1726652959000},"page":"6023","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Research on Multi-Core Curvature Sensing Measurement Based on PPP-BOTDA"],"prefix":"10.3390","volume":"24","author":[{"given":"Zijuan","family":"Liu","sequence":"first","affiliation":[{"name":"Department of Electronic and Communication Engineering, North China Electric Power University, Baoding 071003, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yongqian","family":"Li","sequence":"additional","affiliation":[{"name":"Department of Electronic and Communication Engineering, North China Electric Power University, Baoding 071003, China"},{"name":"Hebei Key Laboratory of Power Internet of Things Technology, North China Electric Power University, Baoding 071003, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3777-3341","authenticated-orcid":false,"given":"Lixin","family":"Zhang","sequence":"additional","affiliation":[{"name":"Department of Electronic and Communication Engineering, North China Electric Power University, Baoding 071003, China"},{"name":"Hebei Key Laboratory of Power Internet of Things Technology, North China Electric Power University, Baoding 071003, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lei","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Energy Storage Science and Engineering, North China University of Technology, Beijing 100144, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2024,9,18]]},"reference":[{"key":"ref_1","first-page":"0106001","article-title":"Current Status and Future of Research and Applications for Distributed Fiber Optic Sensing Technology","volume":"44","author":"Zhang","year":"2024","journal-title":"Acta Opt. 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