Abstract
In this paper, the deployment of a newly developed, multipoint, fiber-optic temperature-sensor system for temperature distribution measurements in a 6 MW gas turbine is demonstrated. The optical sensor fiber was integrated in a stainless steel protection cable with a 1.6 mm outside diameter. It included six measurement points, distributed over a length of 110 mm. The sensor cable was mounted in a temperature probe and was positioned radially in the exhaust-gas diffusor of the turbine. With this temperature probe, the radial temperature profiles in the exhaust-gas diffusor were measured with high spatial and temporal resolution. During a test run of the turbine, characteristic temperature gradients were observed when the machine operated at different loads.
Highlights
Due to its improved maturity and reliability, fiber-optic temperature sensing based on fiber Bragg gratings (FBGs) is becoming more and more interesting for real-world applications
For the measurements presented here, we used regenerated FBGs (RFBGs), which emerge from type I FBGs in H2-loaded fibers when subjected to a special annealing process
The sensor cable consisted of an optical turbine were observed with high spatial and temporal resolutions
Summary
Due to its improved maturity and reliability, fiber-optic temperature sensing based on fiber Bragg gratings (FBGs) is becoming more and more interesting for real-world applications. The most important feature for industrial applications relates to their multiplexing capability. This enables the realization of several tens of temperature measurement points consecutively located in a single fiber and brings down the cabling efforts and the associated obstructions of the air-gas streams due to sensor wiring. In some of the industrial applications that would benefit from using multipoint FBG sensors, temperatures exceed 400 ◦ C. Applications of multipoint sensing based on high-temperature FBGs have been reported for combustor systems [8], nuclear reactors [9], chemical reactors [10,11], and gas turbines [10,12,13]
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