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

J. Lim, Q.P. Yang, B.E. Jones, P.R. Jackson
IMTC 2001. Proceedings of the 18th IEEE Instrumentation and Measurement Technology Conference. Rediscovering Measurement in the Age of Informatics (Cat. No.01CH 37188)  
Multimode fiber optic Bragg grating sensors for strain and temperature measurements using correlation signal processing methods have been developed. Two multimode Bragg grating sensors were fabricated in 62/125 m graded-index silica multimode fiber; the first sensor was produced by the holographic method and the second sensor by the phase mask technique. The sensors have signal reflectivity of approximately 35% at peak wavelengths of 835 nm and 859 nm, respectively. Strain testing of both
more » ... sting of both sensors has been done from 0 to 1000 and the temperature testing from 40 to 80 C. Strain and temperature sensitivity values are 0.55 pm and 6 pm C, respectively. The sensors are being applied in a power-by-light hydraulic valve monitoring system.
doi:10.1109/imtc.2001.929449 fatcat:oyrh2dgwx5bydb5gpklfpkycve