We describe a fibre Fabry-Pérot heat-transfer sensor that is capable of performing the high-spatial-resolution measurements required in turbomachinery research. The all-fibre cavity operates as a calorimeter embedded perpendicular to the test surface. The cavity incorporates a Bragg grating as the internal reflector, producing a mechanically robust sensor suitable for aerodynamic measurements. We present experimental results from an impinging flow rig, comparing the optical sensor with a thin-film resistance gauge subjected to a step increase in heat flux of 30 kW m-2.
|Number of pages||5|
|Journal||Measurement Science and Technology|
|Publication status||Published - Dec 1999|
- Bragg grating
- Fabry-Pérot interferometer
- Heat-flux sensor
- Optical fibre