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1. High-Frequency Optical Fiber Microphone for
Condition-Based Maintenance (CBM) Application
[Optical Metrology, 2013]
Daniele Tosi
University of Limerick, Optical Fibre Sensors Research Centre
Massimo Olivero, Guido Perrone, Alberto Vallan
Politecnico di Torino, Dept. of Electronics and Telecommunications
3. Fiber Bragg grating (FBG)
High-frequency optical fiber microphone for condition-based maintenance application
•Information encoded in
FBG optical spectrum
•Linear dependance on
strain and temperature
•1.08 pm/με (10.2 pm/K)
•High-speed interrogation
•Information encoded in
FBG optical spectrum
•Linear dependance on
strain and temperature
•1.08 pm/με (10.2 pm/K)
•High-speed interrogation
Reflected Bragg wavelength shifts linearly with variation of
tensile strain and temperature
4. High-speed interrogation
High-frequency optical fiber microphone for condition-based maintenance application
High speed, no scanning elements
Short range, high sensitivity
Sensitive to backreflection noise
5. Signal processing
High-frequency optical fiber microphone for condition-based maintenance application
Adaptive filtering
•Mitigates the effect
of backreflection
laser noise
•Applied in pre-
training conditions
Frequency estimat.
•Operate in low
SNR, well below
-35 dB
•Computational
complexity increase
High sensitivity, 0.1 n≲ ε
No real-time detection
13. CBM Condition-Based Maintenance
High-frequency optical fiber microphone for condition-based maintenance application
EMI-prone environment
Critical location placement
Noisy environment
Network structure
Long process time
14. CBM model
High-frequency optical fiber microphone for condition-based maintenance application
Ahmadi, H. and Mollazade, K., "Bearing fault diagnosis of a mine stone crasher by
vibration condition monitoring technique," Res. J. Appl. Sci. Eng. Technol. 1 (2009).
Sound = f(shape) +
+ f(rotation/contact) +
+ f(damage)
Warning signal (fm)
15. CBM model
High-frequency optical fiber microphone for condition-based maintenance application
Ahmadi, H. and Mollazade, K., "Bearing fault diagnosis of a mine stone crasher by
vibration condition monitoring technique," Res. J. Appl. Sci. Eng. Technol. 1 (2009).
16. CBM model
High-frequency optical fiber microphone for condition-based maintenance application
Ahmadi, H. and Mollazade, K., "Bearing fault diagnosis of a mine stone crasher by
vibration condition monitoring technique," Res. J. Appl. Sci. Eng. Technol. 1 (2009).
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