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paper presents the development of an optical fiber sensor system for multiparametric assessment of temperature and turbidity in liquid samples. The sensors are based on the combination between fiber Bragg gratings (FBGs), intensity variation and surface plasmon resonance (SPR) sensors. In this case, the intensity variation sensors are capable of detecting turbidity with a resolution of about 0.5 NTU in a limited range between 0.02 NTU and 100 NTU. As the turbidity increases, a saturation trend in the sensor is observed. In contrast, the SPR-based sensor is capable of detecting refractive index (RI) variation. However, RI measurements in the turbidity calibrated samples indicate a significant variation on the RI only when the turbidity is higher than 100 NTU. Thus, the SPR-based sensor is used as a complementary approach for the dynamic range increase of the turbidity assessment, where a linearity and sensitivity of 98.6% and 313.5 nm\/RIU, respectively, are obtained. Finally, the FBG sensor is used in the temperature assessment, an assessment which is not only used for water quality assessment, but also in temperature cross-sensitivity mitigation of the SPR sensor. Furthermore, this approach also leads to the possibility of indirect assessment of turbidity through the differences in the heat transfer rates due to the turbidity increase.<\/jats:p>","DOI":"10.3390\/bios12111041","type":"journal-article","created":{"date-parts":[[2022,11,18]],"date-time":"2022-11-18T03:29:50Z","timestamp":1668742190000},"page":"1041","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Heterogeneous Optical Fiber Sensor System for Temperature and Turbidity Assessment in Wide Range"],"prefix":"10.3390","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9075-0619","authenticated-orcid":false,"given":"Arnaldo","family":"Leal-Junior","sequence":"first","affiliation":[{"name":"Graduate Program of Electrical Engineering of Federal, University of Esp\u00edrito Santo, Vit\u00f3ria 29075-910, Brazil"},{"name":"Mechanical Engineering Department of Federal, University of Esp\u00edrito Santo, Vit\u00f3ria 29075-910, Brazil"}]},{"given":"Guilherme","family":"Lopes","sequence":"additional","affiliation":[{"name":"Physics Department & I3N, University of Aveiro, 3810-193 Aveiro, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8782-0076","authenticated-orcid":false,"given":"Leandro C.","family":"Macedo","sequence":"additional","affiliation":[{"name":"Graduate Program of Electrical Engineering of Federal, University of Esp\u00edrito Santo, Vit\u00f3ria 29075-910, Brazil"}]},{"given":"Welton","family":"Duque","sequence":"additional","affiliation":[{"name":"Graduate Program of Electrical Engineering of Federal, University of Esp\u00edrito Santo, Vit\u00f3ria 29075-910, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0687-3967","authenticated-orcid":false,"given":"Anselmo","family":"Frizera","sequence":"additional","affiliation":[{"name":"Graduate Program of Electrical Engineering of Federal, University of Esp\u00edrito Santo, Vit\u00f3ria 29075-910, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8596-5092","authenticated-orcid":false,"given":"Carlos","family":"Marques","sequence":"additional","affiliation":[{"name":"Physics Department & I3N, University of Aveiro, 3810-193 Aveiro, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2022,11,18]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"12719","DOI":"10.1109\/JSEN.2020.3040987","article-title":"Diaphragm-Embedded Optical Fiber Sensors: A Review and Tutorial","volume":"21","author":"Marques","year":"2021","journal-title":"IEEE Sens. 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Laser Technol."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"17161","DOI":"10.1038\/lsa.2017.161","article-title":"Ultra-fast polymer optical fibre Bragg grating inscription for medical devices","volume":"7","author":"Bonefacino","year":"2018","journal-title":"Light Sci. Appl."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"885","DOI":"10.1109\/JSEN.2011.2162060","article-title":"Distributed Temperature Sensing: Review of Technology and Applications","volume":"12","author":"Ukil","year":"2012","journal-title":"IEEE Sens. J."},{"key":"ref_7","doi-asserted-by":"crossref","unstructured":"Soares, M.S., Vidal, M., Santos, N.F., Costa, F.M., Marques, C., Pereira, S.O., and Leit\u00e3o, C. (2021). Immunosensing Based on Optical Fiber Technology: Recent Advances. Biosensors, 11.","DOI":"10.3390\/bios11090305"},{"key":"ref_8","doi-asserted-by":"crossref","unstructured":"Guo, T., Gonz\u00e1lez-Vila, \u00c1., Loyez, M., and Caucheteur, C. (2017). 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