Comparative study of multimode CYTOP graded index and single-mode silica fibre Bragg grating array for the mode shape capturing of a free-free metal beam
| Autor: | Michael Polis, Antreas Theodosiou, Amedee Lacraz, Kyriacos Kalli, Michael Komodromos, Andreas Stassis |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Multi-mode optical fiber business.industry Single-mode optical fiber Physics::Optics 02 engineering and technology Laser law.invention Wavelength 020210 optoelectronics & photonics Optics Fiber Bragg grating Normal mode law Femtosecond 0202 electrical engineering electronic engineering information engineering business Beam (structure) |
| Zdroj: | SPIE Proceedings. |
| ISSN: | 0277-786X |
| DOI: | 10.1117/12.2230792 |
| Popis: | The work described in this paper involved two different material fibre Bragg grating (FBG) arrays, investigating their performance as quasi-distributed sensors by capturing the vibrating response of a free-free metal beam close to its resonance frequencies. A six meter length of low-loss, gradient-index, multimode CYTOP fibre and of SMF-28 were used for the inscription of multiple FBG sensors using a femtosecond laser inscription method. The FBG arrays were multiplexed in the wavelength domain using a high-speed commercial demodulator, from which we recovered wavelengthand time-dependent displacement information. We compared the vibration response of the two arrays and using a novel computation algorithm we extract the first mode shape of the free-free metal beam that was exited at its first resonance frequency using a vibrating force. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|