涂层厚度对温度敏感涂料特性的影响实验研究

Considering the problem that the coating thickness and its uniformity are uncontrollable when the TSP (temperature sensitive paint) is sprayed on the model surface， the influence of coating thickness on the TSP characteristics was studied. Based on a type of TSP， four samples with different coating thicknesses were prepared. The pressure sensitivity and temperature sensitivity of TSP samples were measured by intensity method in the self-built TSP characteristic measurement system. Based on the thick edge phenomenon，the influence of coating thickness on the uncertainty of temperature measurement was quantitatively analyzed. The results showed that the coating thickness exerted a significant impact on both the temperature sensitivity and pressure sensitivity of TSP. The maximum relative changes in temperature sensitivity and pressure sensitivity caused by coating thickness were 7.7% and 53.0%，respectively. The measurement uncertainty caused by the coating thickness can be significantly reduced when the coating thickness was greater than 20 μm. During the experiment， special attention should be paid to the coating thickness and its consistency with the calibration experiment. The optimal spraying range should be clarified to guarantee measurement accuracy.