Miniaturized total temperature probe based on fibre Bragg gratings

Leonhard Polz; Tasja Berghaus; Markus Klose; Andreas Zeisberger; Hartmut Bartelt; Johannes Roths

doi:10.1117/12.2059473

2 June 2014 Miniaturized total temperature probe based on fibre Bragg gratings

Leonhard Polz, Tasja Berghaus, Markus Klose, Andreas Zeisberger, Hartmut Bartelt, Johannes Roths

Proceedings Volume 9157, 23rd International Conference on Optical Fibre Sensors; 91579F (2014) https://doi.org/10.1117/12.2059473
Event: OFS2014 23rd International Conference on Optical Fiber Sensors, 2014, Santander, Spain

Abstract

A miniaturized design of a fibre-optic based total temperature probe is presented which is intended to be used for aircraft engine testing. The FBG-based probes were experimentally characterized in the harsh environment of an open jet test bench at air stream velocities up to Mach numbers of 0.8 and they showed similar performance as conventional sensing techniques. The reduction of the size of the transducer was possible by using small sized FBG-based temperature sensors. Due to the smaller probe design and thinner signal transmission cables, less distortion of the air stream is expected with the fibre-optic sensor, when compared to conventional instrumentation. This allows a higher density of instrumented sensors and thus a higher spatial resolution of the measurement. This is, to our knowledge, the first demonstration of total temperature measurements at high air stream velocities with FBG-based transducers.

Citation Download Citation

Leonhard Polz, Tasja Berghaus, Markus Klose, Andreas Zeisberger, Hartmut Bartelt, and Johannes Roths "Miniaturized total temperature probe based on fibre Bragg gratings", Proc. SPIE 9157, 23rd International Conference on Optical Fibre Sensors, 91579F (2 June 2014); https://doi.org/10.1117/12.2059473

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