Potential low-cost optical fiber Bragg grating sensor systems for structural health monitoring and examples of their application

Abstract

Potential low-cost strain, vibration and temperature sensor systems based on draw-tower fabricated fiber Bragg grating arrays and spectral high-resolution polychromator interrogation have been developed. Performance has been demonstrated in field tests of electric power generators, aircrafts and spacecraft structures, railway tracks, and in rock-bolts for mining and geotechnical engineering.

The Turning Error Effect of Reflectors in the Talbot Interferometer used for Writing Fiber Bragg Grating

“…Another problem of the proximityprinting mode is that the period of FBG is half of that of phase mask; that is, the period of FBG is only dependent on the period of the phase mask, and thus, we need to change the phase mask when we want to write an FBG with a different Bragg wavelength. The problems can be resolved through the use of the Talbot interferometer [2][3][4] or its variants [5].…”