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7 May 2012Multi-point sensing in gas turbines using fiber-based intrinsic Fabry-Perot interferometers
It is well known that using a single-mode lead-in fiber, a multi-mode fiber section as a Fabry-Perot cavity, and an
additional single-mode fiber as the tail results in a structure that generates strong interference fringes while remaining
robust. Due to their compact size, sensitivity, and ability to be multiplexed, intrinsic Fabry-Perot interferometers (IFPIs)
are excellent candidates for almost any multi-point temperature or strain application. Four of these sensors were to be
installed on a 2"x2" coupon for installation in a simulated gas turbine environment. Though the basic principles behind
these sensors are well known, serious issues associated with geometric constraints resulting from the size of the test
coupon, sensor placement, and mechanical reinforcement of the fiber arose; fabricating a sensor chain with appropriate
sensor spacing and excellent temperature response characteristics proved a significant challenge. Issues addressed
include inter-sensor interference, high-temperature mechanical reinforcement for bare fiber sections, and high bending
losses. After overcoming these problems, a final sensor chain was fabricated and characterized. This chain was then
subjected to a battery of tests at the National Energy Technology Laboratory (NETL). Final results are presented and
analyzed.
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Tyler Shillig, Cheng Ma, Di Hu, Zhipeng Tian, Anbo Wang, "Multi-point sensing in gas turbines using fiber-based intrinsic Fabry-Perot interferometers," Proc. SPIE 8370, Fiber Optic Sensors and Applications IX, 83700I (7 May 2012); https://doi.org/10.1117/12.920960