{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,5]],"date-time":"2026-04-05T08:06:36Z","timestamp":1775376396328,"version":"3.50.1"},"reference-count":36,"publisher":"MDPI AG","issue":"24","license":[{"start":{"date-parts":[[2022,12,8]],"date-time":"2022-12-08T00:00:00Z","timestamp":1670457600000},"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":["62075067"],"award-info":[{"award-number":["62075067"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["ZQN-PY603"],"award-info":[{"award-number":["ZQN-PY603"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Promotion Program for Young and Middle-aged Teachers in Science and Technology Research of Huaqiao University","award":["62075067"],"award-info":[{"award-number":["62075067"]}]},{"name":"Promotion Program for Young and Middle-aged Teachers in Science and Technology Research of Huaqiao University","award":["ZQN-PY603"],"award-info":[{"award-number":["ZQN-PY603"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Optical fiber sensors are one preferred solution for temperature sensing, especially for their capability of real-time monitoring and remote detection. However, many of them still suffer from a huge sensing system and complicated signal demodulate process. In order to solve these problems, we propose a smartphone-based optical fiber fluorescence temperature sensor. All the components, including the laser, filter, fiber coupler, batteries, and smartphone, are integrated into a 3D-printed shell, on the side of which there is a fiber flange used for the sensing probe connection. The fluorescence signal of the rhodamine B solution encapsulated in the sensing probe can be captured by the smartphone camera and extracted into the R value and G value by a self-developed smartphone application. The temperature can be quantitatively measured by the calibrated G\/R-temperature relation, which can be unified using the same linear relationship in all solid\u2013liquid\u2013gas environments. The performance verifications prove that the sensor can measure temperature in high accuracy, good stability and repeatability, and has a long conservation time for at least 3 months. The proposed sensor not only can measure the temperature for remote and real-time detection needs, but it is also handheld with a small size of 167 mm \u00d7 85 mm \u00d7 75 mm supporting on-site applications. It is a potential tool in the temperature sensing field.<\/jats:p>","DOI":"10.3390\/s22249605","type":"journal-article","created":{"date-parts":[[2022,12,8]],"date-time":"2022-12-08T03:35:53Z","timestamp":1670470553000},"page":"9605","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Smartphone-Based Optical Fiber Fluorescence Temperature Sensor"],"prefix":"10.3390","volume":"22","author":[{"given":"Jianwei","family":"Huang","sequence":"first","affiliation":[{"name":"College of Mechanical Engineering and Automation, Huaqiao University, Xiamen 361021, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2895-9702","authenticated-orcid":false,"given":"Ting","family":"Liu","sequence":"additional","affiliation":[{"name":"College of Mechanical Engineering and Automation, Huaqiao University, Xiamen 361021, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yeyu","family":"Zhang","sequence":"additional","affiliation":[{"name":"College of Mechanical Engineering and Automation, Huaqiao University, Xiamen 361021, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chengsen","family":"Zhan","sequence":"additional","affiliation":[{"name":"College of Mechanical Engineering and Automation, Huaqiao University, Xiamen 361021, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiaona","family":"Xie","sequence":"additional","affiliation":[{"name":"College of Mechanical Engineering and Automation, Huaqiao University, Xiamen 361021, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8767-3889","authenticated-orcid":false,"given":"Qing","family":"Yu","sequence":"additional","affiliation":[{"name":"College of Mechanical Engineering and Automation, Huaqiao University, Xiamen 361021, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dingrong","family":"Yi","sequence":"additional","affiliation":[{"name":"College of Mechanical Engineering and Automation, Huaqiao University, Xiamen 361021, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2022,12,8]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"111287","DOI":"10.1016\/j.mee.2020.111287","article-title":"Development of capacitive temperature sensors with high sensitivity using a multiuser polycrystalline silicon process","volume":"226","author":"Othayq","year":"2020","journal-title":"Microelectron. 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