Modified fs-Laser Inscribed FBG Array for Rapid Mode Shape Capture of Free-Free Vibrating Beams
| Autor: | Michael Polis, Maria Tsangari, Antreas Theodosiou, Amedee Lacraz, Andreas Stassis, Kyriacos Kalli, Michael Komodromos |
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| Rok vydání: | 2016 |
| Předmět: |
PHOSFOS
Optical fiber Materials science Physics::Optics 02 engineering and technology law.invention 020210 optoelectronics & photonics Optics Fiber Bragg grating Sensor array law 0202 electrical engineering electronic engineering information engineering Bragg grating sensors Electrical and Electronic Engineering Surface displacement sampling business.industry Mechanical Engineering Optical fiber sensors Electrical Engineering - Electronic Engineering - Information Engineering Laser Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Femtosecond laser Core (optical fiber) Fiber optic sensor Femtosecond Engineering and Technology business Shape sensing |
| Zdroj: | IEEE Photonics Technology Letters. 28:1509-1512 |
| ISSN: | 1941-0174 1041-1135 |
| DOI: | 10.1109/lpt.2016.2555852 |
| Popis: | We report on the development of a multiplexed sensor array of fiber Bragg gratings (FBGs), inscribed using a femtosecond laser, and its demonstration as a quasi-distributed sensor to capture the mode shapes, through surface displacement sampling, of a free-free vibrating beam. Our method is based on a plane-by-plane inscription approach, whereby a 2-D index change is written across the fiber core, controlling the width and depth of the modified region. This allows for the fast inscription of multiple wavelength FBGs in coated optical fibers, with the advantage of less stringent alignment requirements. The FBGs are multiplexed in the wavelength domain using a high-speed demodulator, using a fast, custom-made computational algorithm. We recover rapid and single-step wavelength- and time-dependent displacement information, extracting the first two mode shapes of a vibrating beam and their respective degrees of freedom resonance frequencies in $ s. |
| Databáze: | OpenAIRE |
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