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Detecting ultrasound acoustic waves through fiber-optic hydrophone (FOH) sensors can be one solution for continuous measurement of volumes inside production tanks used by these industries. This work presents an FOH system composed of two optical fiber coils made with commercial single mode fiber (SMF) working in the sensor head of a Michelson\u2019s interferometer (MI) supported by an active stabilization mechanism that drives another optical coil wound around a piezoelectric actuator (PZT) in the reference arm to mitigate external mechanical and thermal noise from the environment. A 1000 mL glass graduated cylinder filled with water is used as a test tank, inside which the sensor head and an ultrasound source are placed. For detection, amplitudes and phases are measured, and machine learning algorithms predict their respective liquid volumes. The acoustic waves create patterns electronically detected with resolution of 1 mL and sensitivity of 340 mrad\/mL and 70 mvolts\/mL. The nonlinear behavior of both measurands requires classification, distance metrics, and regression algorithms to define an adequate model. The results show the system can determine liquid volumes with an accuracy of 99.4% using a k-nearest neighbors (k-NN) classification with one neighbor and Manhattan\u2019s distance. Moreover, Gaussian process regression using rational quadratic metrics presented a root mean squared error (RMSE) of 0.211 mL.<\/jats:p>","DOI":"10.3390\/s22124404","type":"journal-article","created":{"date-parts":[[2022,6,13]],"date-time":"2022-06-13T02:01:44Z","timestamp":1655085704000},"page":"4404","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Fiber-Optic Hydrophone Based on Michelson\u2019s Interferometer with Active Stabilization for Liquid Volume Measurement"],"prefix":"10.3390","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7235-0948","authenticated-orcid":false,"given":"Welton Sthel","family":"Duque","sequence":"first","affiliation":[{"name":"Telecommunications Laboratory (LABTEL), Graduate Program in Electrical Engineering, Federal University of Esp\u00edrito Santo (UFES), Vit\u00f3ria 29075-910, ES, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9657-5076","authenticated-orcid":false,"given":"Camilo Arturo","family":"Rodr\u00edguez D\u00edaz","sequence":"additional","affiliation":[{"name":"Telecommunications Laboratory (LABTEL), Graduate Program in Electrical Engineering, Federal University of Esp\u00edrito Santo (UFES), Vit\u00f3ria 29075-910, ES, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9075-0619","authenticated-orcid":false,"given":"Arnaldo Gomes","family":"Leal-Junior","sequence":"additional","affiliation":[{"name":"Telecommunications Laboratory (LABTEL), Graduate Program in Electrical Engineering, Federal University of Esp\u00edrito Santo (UFES), Vit\u00f3ria 29075-910, ES, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0687-3967","authenticated-orcid":false,"given":"Anselmo","family":"Frizera","sequence":"additional","affiliation":[{"name":"Telecommunications Laboratory (LABTEL), Graduate Program in Electrical Engineering, Federal University of Esp\u00edrito Santo (UFES), Vit\u00f3ria 29075-910, ES, Brazil"}]}],"member":"1968","published-online":{"date-parts":[[2022,6,10]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"368","DOI":"10.1109\/JLT.2021.3131399","article-title":"High-Speed Optical Communications Systems for Future WDM Centralized Radio Access Networks","volume":"40","author":"Forestieri","year":"2022","journal-title":"J. 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