2017 Volume 37 Issue 147 Pages 23-27
Pressure-/temperature-sensitive paints (PSP/TSP) and molecular tagging measurement techniques based on fluorescence/phosphorescence lifetime are reviewed in this paper. The measurement principles of PSP/TSP and molecular tagging measurements are briefly introduced. In comparison with the intensity-based PSP/TSP measurements, the relation between the fluorescence/phosphorescence lifetime and pressure/temperature independent on illumination intensity; thus, the measurement error induced by variation of illumination intensity will be reduced in the lifetime-based PSP/TSP measurements. Capturing a luminescence image of seeded dye molecules with a certain delay after a laser pulse, the flow velocity can be deduced in the molecular tagging method. The required apparatus for the measurement are discussed. Some examples of measurements are reviewed.