TY - GEN
T1 - Low-cost fiber Bragg grating-based static and dynamic strain system for structural monitoring
AU - Tosi, Daniele
AU - Olivero, Massimo
AU - Perrone, Guido
PY - 2008/9/1
Y1 - 2008/9/1
N2 - 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.
AB - 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.
KW - Civil structures and infrastructures
KW - Fiber Bragg gratings
KW - Fiber optic sensors
KW - Low-cost measurement systems
KW - Nondestructive testing and damage detection
KW - Optical instrumentation
KW - Signal processing
KW - Simultaneously static and dynamic measurement
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U2 - 10.1117/12.803186
DO - 10.1117/12.803186
M3 - Conference contribution
AN - SCOPUS:50249119101
SN - 9780819473264
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Eighth International Conference on Vibration Measurements by Laser Techniques
T2 - 8th International Conference on Vibration Measurements by Laser Techniques: Advances and Applications
Y2 - 18 June 2008 through 20 June 2008
ER -