Simultaneous Measurement of Separately Pressure and Temperature Distribution Using Pyrromethene 546

Abstract

Recently, Temperature/Pressure Sensitive Paint (T/PSP) has been promising as a 2-dimentional quantitative optical measurement, because T/PSP is a very simple system with high spatial resolution. However, PSP depends generally on temperature as well as pressure. It is, therefore, necessary to eliminate temperature sensitivity in spite of having still pressure sensitivity. In this study, a mixed dye system ; Pyrromethene 546 and Ru (dpp) ₃Cl₂, is proposed as a temperature-independent PSP. Temperature variation of this system was experimentally found to be reduced to 95% in comparison with that of single PSP dye ; i.e. Ru (dpp) ₃Cl₂, because these dyes have opposite temperature dependencies in the same spectral band. Furthermore, the spectrum of the mixed dye system can be separated in respective spectral bands, which can be employed as temperature-independent and pressure-independent band. We constructed a dual emission imaging system ; i.e. 2-camera system, which was able to simultaneously capture images under both spectral bands. Consequently, it was verified that, using this system with proposed mixed P/TSP dye, temperature and pressure distribution can be independently measure at the same time.