Heat flux and unsteady temperature measurements in turbomachinery using miniature fiber optic interferometers

Steve Kidd, James S. Barton, Julian D. Jones, Kamaljit S. Chana

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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 µm), 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 µm) 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.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Pages570-581
Number of pages12
Volume2005
Publication statusPublished - 1993
EventOptical Diagnostics in Fluid and Thermal Flow - San Diego, CA, USA
Duration: 14 Jul 199316 Jul 1993

Conference

ConferenceOptical Diagnostics in Fluid and Thermal Flow
CitySan Diego, CA, USA
Period14/07/9316/07/93

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