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 language | English |
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| Title of host publication | Proceedings of SPIE - The International Society for Optical Engineering |
| Pages | 570-581 |
| Number of pages | 12 |
| Volume | 2005 |
| Publication status | Published - 1993 |
| Event | Optical Diagnostics in Fluid and Thermal Flow - San Diego, CA, USA Duration: 14 Jul 1993 → 16 Jul 1993 |
Conference
| Conference | Optical Diagnostics in Fluid and Thermal Flow |
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| City | San Diego, CA, USA |
| Period | 14/07/93 → 16/07/93 |