From Event: SPIE Optical Engineering + Applications, 2016
High temperature solid-oxide fuel cells (SOFCs) present a challenging harsh environment for sensor systems with temperatures above 800C and ambient hydrogen concentration potentially ranging from 0-100% across the cell’s anode. A strong gradient exists in both gas concentration and temperature from the fuel-inlet to outlet as fuel is consumed across the cell. We report a technique for measuring the spatial distribution of temperature along a solid-oxide fuel-cell interconnect channel using a distributed interrogation system coupled with a single-mode fiber optic thin-film evanescent wave absorption sensor. These sensors are to be operated inside an operating fuel-cell stack yielding spatially distributed measurements with sub-millimeter accuracy. Details are presented pertinent to the stable operation of silica optical fibers in the presence of high hydrogen concentration which can induce optical fiber losses. The stability of Rayleigh scattering centers is discussed with regard to the operational environment. The potential for extension of the approach to chemical (i.e. hydrogen) sensing as well as dual hydrogen/temperature sensor fabrication and stabilization are also briefly discussed.
M. Buric, P. Ohodnicki, A. Yan, S. Huang, and K. P. Chen, "Distributed fiber-optic sensing in a high-temperature solid-oxide fuel cell," Proc. SPIE 9977, Remote Sensing System Engineering VI, 997708 (Presented at SPIE Optical Engineering + Applications: September 01, 2016; Published: 19 September 2016); https://doi.org/10.1117/12.2238534.
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