Low-cost fiber Bragg grating-based static and dynamic strain system for structural monitoring

Daniele Tosi, Massimo Olivero, Guido Perrone

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

A fiber Bragg grating sensor for simultaneous static and dynamic strain detection is hereby presented. The principle of operation of the interrogator is based on direct intensity detection: a fixed-wavelength laser source is filtered through the sensing element, and the output power is detected with a photodiode. Multiple sensing for matched-wavelength gratings is performed by splitting the source into multiple channels. The exploitation of cheap components for optical telecommunications results in a low-cost hardware solution that matches several budget-constrained applications. The optical sensor is complemented by signal processing techniques (adaptive filters, spectral estimation, data modeling), capable of improving performances of the system without changing the optical layout. The system has been tested both in static interrogation, as a temperature sensor, and as vibration detector in a typical structural monitoring context. The maximum interrogation range is ∼200με, depending on the grating shape, with a resolution <<1 με, and a repeatability of ∼1%. A 1% stability over long time has been assessed with a long-term test. The adaptive filtering improves the signal-to-noise ratio of 5.3 dB. The resolution-unlimited spectral estimator resolves resonance peak detection for a vibration of 0.1με.

Original languageEnglish
Title of host publicationEighth International Conference on Vibration Measurements by Laser Techniques
Subtitle of host publicationAdvances and Applications
DOIs
Publication statusPublished - Sep 1 2008
Event8th International Conference on Vibration Measurements by Laser Techniques: Advances and Applications - Ancona, Italy
Duration: Jun 18 2008Jun 20 2008

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7098
ISSN (Print)0277-786X

Other

Other8th International Conference on Vibration Measurements by Laser Techniques: Advances and Applications
CountryItaly
CityAncona
Period6/18/086/20/08

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Keywords

  • Civil structures and infrastructures
  • Fiber Bragg gratings
  • Fiber optic sensors
  • Low-cost measurement systems
  • Nondestructive testing and damage detection
  • Optical instrumentation
  • Signal processing
  • Simultaneously static and dynamic measurement

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Tosi, D., Olivero, M., & Perrone, G. (2008). Low-cost fiber Bragg grating-based static and dynamic strain system for structural monitoring. In Eighth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications [70981G] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7098). https://doi.org/10.1117/12.803186