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Strain and temperature sensors using multimode optical fiber Bragg gratings and correlation signal processing

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4 Author(s)
Lim, J. ; Centre for Manuf. Metrol., Brunel Univ., Uxbridge, UK ; Yang, Q.P. ; Jones, B.E. ; Jackson, P.R.

A novel type multimode fiber optic Bragg grating (MM-FBG) sensor for strain and temperature sensing has been developed for a power-by-light hydraulic valve monitoring system. The Bragg grating sensor was fabricated by the holographic method in 62/125 μm graded-index silica multimode fiber. The sensor has reflectivity of approximately 35% at 835 nm of peak wavelength. The experiment of strain sensing has been tested by apply axial strains from zero to 1000 με and the temperature sensing test has been done for temperatures from -40°C and 80°C. The strain sensitivity of the MM-FBG is 0.55 pm/με and the average temperature sensitivity is approximately 6 pm/°C

Published in:

Instrumentation and Measurement Technology Conference, 2001. IMTC 2001. Proceedings of the 18th IEEE  (Volume:3 )

Date of Conference:

2001