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de la Torre O, Floris I, Sales S, et al. Fiber Bragg Grating Sensors for Underwater Vibration Measurement: Potential Hydropower Applications. Sensors (Basel). 2021;21(13)doi: 10.3390/s21134272.
de la Torre, O., Floris, I., Sales, S., & Escaler, X. (2021). Fiber Bragg Grating Sensors for Underwater Vibration Measurement: Potential Hydropower Applications. Sensors (Basel, Switzerland), 21(13), . https://doi.org/10.3390/s21134272
de la Torre, Oscar, et al. "Fiber Bragg Grating Sensors for Underwater Vibration Measurement: Potential Hydropower Applications." Sensors (Basel, Switzerland) vol. 21,13 (2021). doi: https://doi.org/10.3390/s21134272
de la Torre O, Floris I, Sales S, Escaler X. Fiber Bragg Grating Sensors for Underwater Vibration Measurement: Potential Hydropower Applications. Sensors (Basel). 2021 Jun 22;21(13). doi: 10.3390/s21134272. PMID: 34206676; PMCID: PMC8271917.
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Sensors (Basel). 2021 Jun 22;21(13). doi: 10.3390/s21134272.

Fiber Bragg Grating Sensors for Underwater Vibration Measurement: Potential Hydropower Applications.

Sensors (Basel, Switzerland)

Oscar de la Torre, Ignazio Floris, Salvador Sales, Xavier Escaler

Affiliations

  1. Barcelona Fluids & Energy Lab, Universitat Politécnica de Catalunya, 08028 Barcelona, Spain.
  2. ITEAM, Universitat Politecnica de Valencia, 46022 Valencia, Spain.

PMID: 34206676 PMCID: PMC8271917 DOI: 10.3390/s21134272

Abstract

The present paper assesses the performance and characteristics of fiber Bragg grating sensors, with a special interest in their applications in hydraulic machinery and systems. The hydropower industry is turning to this technology with high expectations of obtaining high quality data to validate and calibrate numerical models that could be used as digital twins of key assets, further strengthening the sector's relevant position within industry 4.0. Prior to any validation, fiber Bragg grating sensors' ability to perform well underwater for long periods of time with minimal degradation, and their ease of scalability, drew the authors´ attention. A simplified modal analysis of a partially submerged beam is proposed here as a first step to validate the potential of this type of technology for hydropower applications. Fiber Bragg grating sensors are used to obtain the beam's natural frequencies and to damp vibrations under different conditions. The results are compared with more established waterproof electric strain gauges and a laser vibrometer with good agreement. The presence of several sensors in a single fiber ensures high spatial resolution, fundamental to precisely determine vibration patterns, which is a main concern in this industry. In this work, the beam's vibration patterns have been successfully captured under different excitations and conditions.

Keywords: fluids; hydroelectric power generation; optical fiber sensors; vibration measurement

Conflict of interest statement

The authors declare no conflict of interest.

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