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| Abstract |
Recently, the application field of pressure measurement technique using pressure sensitive paint (PSP) has been expanding. However, temperature dependence of PSP is one of a serious obstacle to accura...te pressure measurement in low gauge pressure condition because PSP is absolute pressure sensor. Therefore, temperature information of PSP is indispensably required for accurate pressure measurement, especially in low gauge pressure condition. As a result, both temperature information and pressure information w ith a function of temperature are required simultaneously to use the PSP in low gauge pressure condition. Dual layer PSP/TSP (DL PTSP) is one solution, but simultaneous measurement of pressure and temperature requires two optical filters to separate lumine scence of PSP and TSP, resulting in complex equipment and additional error caused by parallax. To solve the problem, we introduce lifetime based method for DL PTSP that allows simultaneous measurement of pressure and temperature. It is a method to separate each component of luminescence with different lifetimes. At first, The DL PTSP developed in this study was optimized by reducing the luminescence intensity of the PSP with longer lifetime while maintaining the luminescence intensity of the TSP with shorter lifetime, considering the lifetime measurement method. Secondly, we have clarified the optimum time conditions the monolayer TSP and the monolayer PSP by the analysis of their luminescence decay process, by controlling the irradiation delay of light sour ce relative to camera shutter. Thirdly, sensitivity of the DL PTSP using the conditions optimized for mono layer TSP and PSP was examined. The luminescence decay of the TSP component shows sufficient temperature dependence, while pressure dependence is ver y small. On the other hand, the dependence of the luminescence decay of the PSP component on temperature and pressure is almost equal to that of the mono layer PSP. The results confirm the feasibility of simultaneous measurement of pressure and temperature using DL PTSP.show more
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