{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,9]],"date-time":"2026-07-09T17:02:03Z","timestamp":1783616523202,"version":"3.55.0"},"reference-count":37,"publisher":"MDPI AG","issue":"16","license":[{"start":{"date-parts":[[2019,8,20]],"date-time":"2019-08-20T00:00:00Z","timestamp":1566259200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["61675066, 61302075"],"award-info":[{"award-number":["61675066, 61302075"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100005046","name":"Natural Science Foundation of Heilongjiang Province","doi-asserted-by":"publisher","award":["QC2015068"],"award-info":[{"award-number":["QC2015068"]}],"id":[{"id":"10.13039\/501100005046","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>In this paper, a comprehensive passive torsion measurement is performed firstly in a 40-cm-long polarization maintaining fiber-based Sagnac interferometer (PMF-SI), and the non-linear torsion response is found and investigated. Then, a fiber laser torsion sensor (FLTS) with a dual-ring-cavity structure is proposed and experimentally demonstrated, in which the PMF-SI is utilized as the optical filter as well as the sensing unit. In particular, the highly sensitive linear range is adjusted through fine phase modulation, and owing to the flat-top feature of fringes, an ~83.6% sensitivity difference is effectively compressed by the generated lasing. The experimental results show that, without any pre-twisting, the ultra-wide linear response from \u2013175 to 175 rad\/m is gained, and the torsion sensitivities are 2.46 and 1.55 nm\/rad with high linearity (&gt;0.99) in the clockwise and anti-clockwise directions, respectively. Additionally, a high extinction ratio (&gt;42 dB) and small line-width (~0.14 nm) are obtained in the proposed FLTS, and the corresponding detection limit reaches 0.015 rad\/m.<\/jats:p>","DOI":"10.3390\/s19163613","type":"journal-article","created":{"date-parts":[[2019,8,21]],"date-time":"2019-08-21T11:19:06Z","timestamp":1566386346000},"page":"3613","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["Fiber Ring Laser Directional Torsion Sensor with Ultra-Wide Linear Response"],"prefix":"10.3390","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4410-3576","authenticated-orcid":false,"given":"Xianjin","family":"Liu","sequence":"first","affiliation":[{"name":"College of Electronics Engineering, Heilongjiang University, Harbin 150080, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fengjuan","family":"Wang","sequence":"additional","affiliation":[{"name":"College of Electronics Engineering, Heilongjiang University, Harbin 150080, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5572-934X","authenticated-orcid":false,"given":"Jiuru","family":"Yang","sequence":"additional","affiliation":[{"name":"College of Electronics Engineering, Heilongjiang University, Harbin 150080, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xudong","family":"Zhang","sequence":"additional","affiliation":[{"name":"College of Electronics Engineering, Heilongjiang University, Harbin 150080, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiliang","family":"Du","sequence":"additional","affiliation":[{"name":"College of Electronics Engineering, Heilongjiang University, Harbin 150080, China"},{"name":"School of Electronic Information and Electrical Engineering, Chongqing University of Arts and Sciences, Chongqing 402160, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2019,8,20]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"14308","DOI":"10.1364\/OE.25.014308","article-title":"Long period fiber grating based on periodically screw-type distortions for torsion sensing","volume":"25","author":"Deng","year":"2017","journal-title":"Opt. 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