Title :
Optical Inclinometer Based on a Phase-Shifted Bragg Grating in a Taper Configuration
Author :
Moura, J.P. ; Silva, S.O. ; Becker, Matthias ; Rothhardt, Manfred ; Bartelt, Hartmut ; Santos, Jose Luis ; Frazao, Orlando
Author_Institution :
INESC Porto, Porto, Portugal
Abstract :
A simple optical inclinometer based on a phase-shifted Bragg grating in a taper configuration is proposed. Two phase-shifted fiber Bragg gratings were fabricated using a DUV femtosecond laser technique in the taper region, with taper waist diameters of 30 μm and 50 μm. Both sensing heads were compared based on their response to angle and strain. Whereas the higher diameter sensor yielded a higher sensitivity to curvature (23.8±0.3 pm/degree), the lower diameter one was more sensitive to strain (8.94±0.04 pm/με).
Keywords :
Bragg gratings; fibre optic sensors; laser materials processing; optical fibre fabrication; optical phase shifters; spatial variables measurement; DUV femtosecond laser technique; angle response; higher diameter sensor; phase-shifted fiber Bragg grating fabrication; sensing heads; simple optical inclinometer; size 30 mum; size 50 mum; strain response; taper configuration; taper region; taper waist diameters; Fiber gratings; Gratings; Sensitivity; Sensors; Strain; Ultrafast optics; Bragg gratings; Optical fiber sensors; Taper;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2013.2295323
