Abstract
We develop a non-invasive measurement system based on fluorescence. The development of the system arises from the investigations of heat transfer characteristics of thermal energy storage and magnetic refrigeration. We use a light emitting diode (LED) as a light source instead of a laser. In order to evaluate the measurement feasibility and performance, an experiment was carried out using a heated test section filled with fluid. The test section was carefully designed based on the critical Rayleigh number, so that the heat transfer in the section would be dominated by conductive heat transfer only. Spatial temperature distribution was obtained by converting the fluorescence irradiance to temperature through calibration data. The initial result exhibited the expected monotonic temperature distribution in the test section and the feasibility of the temperature measurement based on the LED-induced fluorescence (LEDIF) was confirmed.
