Solid-state interferometric interrogator and multiplexer for high-speed dynamic and absolute FBG wavelength measurement

Orr, Philip and Perry, Marcus and Fusiek, Grzegorz and Niewczas, Pawel (2013) Solid-state interferometric interrogator and multiplexer for high-speed dynamic and absolute FBG wavelength measurement. In: Proceedings of SPIE Volume 8794. SPIE--The International Society for Optical Engineering.. ISBN 9780819496348

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Abstract

We present a solid-state FBG array interrogator and multiplexer capable of determining absolute FBG wavelengths and of providing high-speed, high-resolution static and dynamic measurements. Using a described procedure, deployable on multiplexing passive-interferometric schemes, the system is able to determine initial sensor wavelengths and thereafter track wavelength changes with interferometric resolution. The scheme allows high-resolution interrogation of FBG sensor arrays to be applied to many industrial applications, where previously the lack of combined absolute and quasi-static wavelength measurement precluded the use of interferometric techniques. Using a preliminary laboratory embodiment, we demonstrate a wavelength determination accuracy of <0.3 nm and a measurement resolution of 10 fm/√Hz, and propose pathways to improved performance and miniaturisation.