The improvement and validation of laser induced fluorescence technology on temperature and concentration measurement

Abstract

Laser induced fluorescence (LIF) is characterized as a non-insertion and whole-field measuring technology, which is commonly used in the thermal–hydraulic experiments. The conventional method for LIF technology is performed on the basis of the theoretical correlations for the fluorescence. A new method for the LIF base on the calibration tests and empirical fitted polynomial was proposed. The mock refueling water tank and mock reactor pressure vessel (RPV) were employed to verify the new method. The precise comparison between the conventional method and new method was carried out. The results indicated that the deviation in temperature measurement was within 0.5 °C for the improved method, and it was within 1.0 °C for the conventional method. The concentration measurement error was within 5.67 % for the improved method, and it was about 7.10 % for the conventional method. The improvement in measurement accuracy brought by new methods of great importance for the thermal–hydraulic experiments.