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Proceedings Paper

Heat flux and unsteady temperature measurements in turbomachinery using miniature fiber optic interferometers
Author(s): Stephen R. Kidd; James S. Barton; Julian D. C. Jones; Kamaljit S. Chana
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Paper Abstract

We describe the development of fiber optic sensors to measure heat flux and unsteady temperature in wind tunnel experiments for turbomachinery applications. The sensors are intrinsic Fabry-Perot interferometers fabricated from single-mode optical fiber. The optical path length within the interferometer fiber is sensitive to temperature. We present results from three sensors embedded as calorimeter gauges in a ceramic nozzle guide vane end wall model exposed to a transient heat flux in wind tunnel experiments and validated by comparison with previous data from platinum thin film resistance gauges. The optical sensors exhibit high spatial resolution (approximately 5 micrometers ), high heat transfer resolution (approximately 1 kWm-2), and wide temperature measurement bandwidth (100 kHz) with intrinsic calibration. No electrical connections to the measurement volume are required and multiplexing is possible. Very short length (< 60 micrometers ) fiber sensors have been constructed and demonstrated as fast response thermometers suitable for measuring gas total temperature fluctuations in unsteady flow fields. We show results from a vortex shedding experiment from a heated bluff body in continuous flow generating temperature oscillations at 3 kHz.

Paper Details

Date Published: 2 December 1993
PDF: 12 pages
Proc. SPIE 2005, Optical Diagnostics in Fluid and Thermal Flow, (2 December 1993); doi: 10.1117/12.163742
Show Author Affiliations
Stephen R. Kidd, Heriot-Watt Univ. (United Kingdom)
James S. Barton, Heriot-Watt Univ. (United Kingdom)
Julian D. C. Jones, Heriot-Watt Univ. (United Kingdom)
Kamaljit S. Chana, Defence Research Agency, Pyestock (United Kingdom)


Published in SPIE Proceedings Vol. 2005:
Optical Diagnostics in Fluid and Thermal Flow
Soyoung Stephen Cha; James D. Trolinger, Editor(s)

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