Optical fibre sensors offer the prospect of miniature aerodynamic probes for highly localised flow measurements in aerospace wind tunnels and turbomachines. We discuss the design and construction of optical fibre sensors for temperature and pressure. The temperature sensors consist of multilayer coatings deposited on the fibre end face from which the reflected intensity is temperature-dependent. Two sensors were incorporated in a dual heated probe to measure total temperature. The pressure sensors are miniature diaphragms in which pressure-induced deflection is measured interferometrically in reflection. We present results from initial trials made in unsteady flow in a single stage research turbine, in which total temperature data with harmonic components up to 30 kHz and total pressure signals up to 230 kHz were recorded.

Volume Subject Area:
Controls, Diagnostics and Instrumentation
Topics:
Optical fiber, Pressure, Probes, Temperature measurement, Turbomachinery, Temperature, Fiber optic sensors, Aerospace industry, Coatings, Construction, Deflection, Design, Diaphragms (Mechanical devices), Diaphragms (Structural), Fibers, Flow measurement, Pressure sensors, Reflection, Sensors, Signals, Temperature sensors, Turbines, Unsteady flow, Wind tunnels
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