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The strength development of the filled marine soils is of great importance during the sedimentation and consolidation to guide the filling process and construction of reclamation. In this study, a novel sensor based on optical frequency domain reflectometry (OFDR) technology with a simple design was developed for undrained shear strength measurement. The novel sensor consists of an optical fiber and a series of polyoxymethylene coins. Owing to the merits of OFDR technology on high resolution, fully distributed sensing, and immunity to electromagnetic interference, the novel sensor can be used to determine undrained shear strength profiles of very soft to soft marine sediments\/soils with good accuracy. The sensor was calibrated in remolded marine deposits with different water contents. The good feasibility and performance of the novel sensor for undrained shear strength measurement were well validated in two physical model tests on marine deposits treated by horizontal drains with vacuum preloading.<\/jats:p>","DOI":"10.3390\/s22155530","type":"journal-article","created":{"date-parts":[[2022,7,26]],"date-time":"2022-07-26T00:17:27Z","timestamp":1658794647000},"page":"5530","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["A Novel Sensor for Undrained Shear Strength Measurement in Very Soft to Soft Marine Sediments Based on Optical Frequency Domain Reflectometry Technology"],"prefix":"10.3390","volume":"22","author":[{"given":"Pei-Chen","family":"Wu","sequence":"first","affiliation":[{"name":"Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wen-Bo","family":"Chen","sequence":"additional","affiliation":[{"name":"Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jian-Hua","family":"Yin","sequence":"additional","affiliation":[{"name":"Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China"},{"name":"Department of Civil and Environmental Engineering, Research Institute of Land and Space, The Hong Kong Polytechnic University, Hong Kong, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yu","family":"Pan","sequence":"additional","affiliation":[{"name":"Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1159-6845","authenticated-orcid":false,"given":"Kai","family":"Lou","sequence":"additional","affiliation":[{"name":"Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5480-9719","authenticated-orcid":false,"given":"Wei-Qiang","family":"Feng","sequence":"additional","affiliation":[{"name":"Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China"},{"name":"Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 510000, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2022,7,25]]},"reference":[{"key":"ref_1","unstructured":"Du, D.J., Yang, A.U., and Liu, J. 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