{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,14]],"date-time":"2026-01-14T15:21:21Z","timestamp":1768404081948,"version":"3.49.0"},"reference-count":29,"publisher":"MDPI AG","issue":"14","license":[{"start":{"date-parts":[[2021,7,8]],"date-time":"2021-07-08T00:00:00Z","timestamp":1625702400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>A coherent optical fiber sensor with adequate sensitivity for detecting the acoustic emission (AE) during the propagation of a crack in a ferrous material is presented. The proposed fiber optic sensor is successfully compared in terms of the SNR (Signal to Noise Ratio) and detectable AE energy levels to commercially available AE piezo-transducers sensors and is proven to be an effective and advantageous alternative for sensing and monitoring fatigue damage in structural applications.<\/jats:p>","DOI":"10.3390\/s21144674","type":"journal-article","created":{"date-parts":[[2021,7,8]],"date-time":"2021-07-08T04:32:49Z","timestamp":1625718769000},"page":"4674","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Coherent Fiber-Optic Sensor for Ultra-Acoustic Crack Emissions"],"prefix":"10.3390","volume":"21","author":[{"given":"Ilaria","family":"Di Luch","sequence":"first","affiliation":[{"name":"Dipartimento di Elettronica, Informazione e Biomedica, Politecnico di Milano, 20133 Milano, Italy"}]},{"given":"Maddalena","family":"Ferrario","sequence":"additional","affiliation":[{"name":"Cohaerentia s.r.l., 20133 Milano, Italy"}]},{"given":"Davide","family":"Fumagalli","sequence":"additional","affiliation":[{"name":"Dipartimento di Meccanica, Politecnico di Milano, 20156 Milano, Italy"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0828-9067","authenticated-orcid":false,"given":"Michele","family":"Carboni","sequence":"additional","affiliation":[{"name":"Dipartimento di Meccanica, Politecnico di Milano, 20156 Milano, Italy"}]},{"given":"Mario","family":"Martinelli","sequence":"additional","affiliation":[{"name":"Dipartimento di Elettronica, Informazione e Biomedica, Politecnico di Milano, 20133 Milano, Italy"}]}],"member":"1968","published-online":{"date-parts":[[2021,7,8]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Beattie, A.G. 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