150782 20251017144651.0 doi 10.5220/0007373700460051 sideral 134155 ART-2019-134155 eng Preciado, Javier (orcid)0000-0001-5898-8777 Amplitude vibration measurement by harmonic frequency analysis of a distributed acoustic sensor 2019 Distributed acoustic sensors (DAS) based in coherent optical time-domain reflectometry (C-OTDR) provide a cost-effective solution for intrusion monitoring of large civil infrastructures like pipelines, railways or motorways. Although detection of events is well demonstrated, an estimation of the amplitude of these events is difficult to achieve. We propose a new method to recover the amplitude of the vibration from the conventional C-OTDR backscattered power traces. It is based on the FFT analysis of the DAS signals. Using a discrete accelerometer as a reference, we have calibrated the response of an optical fiber DAS using known stimuli. A correlation between the amplitude of the vibration and the ratios of the amplitudes of harmonics to the fundamental of the DAS signals is demonstrated. This analysis overcomes the main issues of the amplitude measurement, related to the interaction between the stimulus and the interference pattern. info:eu-repo/grantAgreement/ES/MINECO/DI-17-09169 info:eu-repo/grantAgreement/ES/MINECO/RTC-2016-5212-8 info:eu-repo/semantics/closedAccess All rights reserved http://www.europeana.eu/rights/rr-f/ info:eu-repo/semantics/conferenceObject info:eu-repo/semantics/publishedVersion Sanahuja, David Universidad de Zaragoza (orcid)0000-0002-2660-5652 Heras, Carlos Universidad de Zaragoza (orcid)0000-0001-5608-8679 Subías, Jesús Universidad de Zaragoza (orcid)0000-0002-2244-170X Hidalgo, Lucía Universidad de Zaragoza Salinas, Iñigo Universidad de Zaragoza (orcid)0000-0002-6144-7928 Sevillano, Pascual Universidad de Zaragoza (orcid)0000-0002-4094-3826 Martínez, Juan José Villafranca, Asier 2002 385 Universidad de Zaragoza Dpto. Física Aplicada Área Física Aplicada 5008 800 Universidad de Zaragoza Dpto. Ingeniería Electrón.Com. Área Teoría Señal y Comunicac. 1, 7 (2019), 46-51 Photoptics (Setúbal) 2184-352X 760442 http://zaguan.unizar.es/record/150782/files/texto_completo.pdf Versión publicada 2355118 http://zaguan.unizar.es/record/150782/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:150782 articulos driver 2025-10-17-14:36:33 ARTICLE