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This review attempts to cover the majority of optical humidity sensors reported to date, highlight trends in design and performance, and discuss the challenges of different applications.<\/jats:p>","DOI":"10.3390\/s21238049","type":"journal-article","created":{"date-parts":[[2021,12,2]],"date-time":"2021-12-02T02:56:14Z","timestamp":1638413774000},"page":"8049","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":83,"title":["Review of Optical Humidity Sensors"],"prefix":"10.3390","volume":"21","author":[{"given":"Xing","family":"Rao","sequence":"first","affiliation":[{"name":"Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education\/GuangDong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China"},{"name":"Shenzhen Key Laboratory of Photonic Devices and Sensing Systems for Internet of Things, Guangdong and Hong Kong Joint Research Centre for Optical Fibre Sensors, Shenzhen University, Shenzhen 518060, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1643-1676","authenticated-orcid":false,"given":"Lin","family":"Zhao","sequence":"additional","affiliation":[{"name":"Laser Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China"}]},{"given":"Lukui","family":"Xu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education\/GuangDong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China"},{"name":"Shenzhen Key Laboratory of Photonic Devices and Sensing Systems for Internet of Things, Guangdong and Hong Kong Joint Research Centre for Optical Fibre Sensors, Shenzhen University, Shenzhen 518060, China"}]},{"given":"Yuhang","family":"Wang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education\/GuangDong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China"},{"name":"Shenzhen Key Laboratory of Photonic Devices and Sensing Systems for Internet of Things, Guangdong and Hong Kong Joint Research Centre for Optical Fibre Sensors, Shenzhen University, Shenzhen 518060, China"}]},{"given":"Kuan","family":"Liu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education\/GuangDong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China"},{"name":"Shenzhen Key Laboratory of Photonic Devices and Sensing Systems for Internet of Things, Guangdong and Hong Kong Joint Research Centre for Optical Fibre Sensors, Shenzhen University, Shenzhen 518060, China"}]},{"given":"Ying","family":"Wang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education\/GuangDong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China"},{"name":"Shenzhen Key Laboratory of Photonic Devices and Sensing Systems for Internet of Things, Guangdong and Hong Kong Joint Research Centre for Optical Fibre Sensors, Shenzhen University, Shenzhen 518060, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2469-9093","authenticated-orcid":false,"given":"George Y.","family":"Chen","sequence":"additional","affiliation":[{"name":"Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education\/GuangDong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China"},{"name":"Shenzhen Key Laboratory of Photonic Devices and Sensing Systems for Internet of Things, Guangdong and Hong Kong Joint Research Centre for Optical Fibre Sensors, Shenzhen University, Shenzhen 518060, China"}]},{"given":"Tongyu","family":"Liu","sequence":"additional","affiliation":[{"name":"Laser Institute, Qilu University of 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