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


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
Number of pages12
Publication statusPublished - 1993
EventOptical Diagnostics in Fluid and Thermal Flow - San Diego, CA, USA
Duration: 14 Jul 199316 Jul 1993


ConferenceOptical Diagnostics in Fluid and Thermal Flow
CitySan Diego, CA, USA


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