Damage detection in composite materials using optical fibers: recent advances in signal processing

2000 ◽  
Author(s):  
Wieslaw J. Staszewski ◽  
Ian J. Read ◽  
Peter D. Foote
Keyword(s):  
Signal Processing ◽  
Composite Materials ◽  
Damage Detection ◽  
Optical Fibers ◽  
Recent Advances

Signal Processing Enhanced Fiber Vibration Sensors

2013 ◽  
Vol 543 ◽  
pp. 302-305
Author(s):  
Daniele Tosi ◽  
Massimo Olivero ◽  
Alberto Vallan ◽  
Guido Perrone
Keyword(s):  
Signal Processing ◽  
Optical Fibers ◽  
Adaptive Filters ◽  
Spectral Estimation ◽  
Cost Effective ◽  
Fiber Sensors ◽  
High Frequencies ◽  
Vibration Sensors ◽  
Signal Processing Algorithms ◽  
Plastic Optical Fibers

The paper analyzes the feasibility of cost-effective fiber sensors for the measurement of small vibrations, from low to medium-high frequencies, in which the complexity of the measurement is moved from expensive optics to cheap electronics without losing too much performance thanks to signal processing algorithms. Two optical approaches are considered: Bragg gratings in standard telecom fibers, which represent the most common type of commercial fiber sensors, and specifically developed sensors made with plastic optical fibers. In both cases, to keep the overall cost low, vibrations are converted into variations of the light intensity, although this makes the received signal more sensitive to noise. Then, adaptive filters and advanced spectral estimation techniques are used to mitigate noise and improve the sensitivity. Preliminary results have demonstrated that the combined effect of these techniques can yield to a signal-to-noise improvement of about 30 dB, bringing the proposed approaches to the level of the most performing sensors for the measurement of vibrations.

scholarly journals Heterogeneous ZnO-containing catalysts for efficient biodiesel production

RSC Advances ◽  
2021 ◽  
Vol 11 (33) ◽  
pp. 20465-20478
Author(s):  
Anping Wang ◽  
Wenxuan Quan ◽  
Heng Zhang ◽  
Hu Li ◽  
Song Yang
Keyword(s):  
Composite Materials ◽  
Catalytic Conversion ◽  
Biodiesel Production ◽  
Functional Composite ◽  
Recent Advances

This review introduces recent advances in the catalytic conversion of oils into biodiesel using ZnO functional composite materials.

Development of high-speed optical wavelength interrogation system for damage detection in composite materials

2005 ◽  
Author(s):  
Shinji Komatsuzaki ◽  
Seiji Kojima ◽  
Akihito Hongo ◽  
Nobuo Takeda ◽  
Takeo Sakurai
Keyword(s):  
Composite Materials ◽  
Damage Detection ◽  
High Speed ◽  
Optical Wavelength
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