Physical Properties of Paints

This chapter describes typical PSPs that use platinum porphyrins, ruthenium polypyridyls, and pyrene derivatives as pressure-sensing molecules in different polymer binders. The absorption and emission spectra of these PSPs are described and the Stern–Volmer relations of these PSPs are given. Then, fast PSPs (highly porous PSPs) for time-resolved measurements in unsteady flows are discussed, which are based on anodized aluminum (AA), polymer/ceramic (PC) mixture, and poly(TMSP). Furthermore, AA-PSP and poly(TMSP)-PSP can work at cryogenic temperatures. Multiple-luminophore PSP is used to relax the requirement of a wind-off reference image and reduce the temperature effect on PSP measurement. The condition for designing an “ideal PSP” is discussed. Similarly, typical TSPs are described for steady, transient, and time-resolved measurements along with cryogenic TSPs. The desirable properties of PSP (or TSP) for wind tunnel testing are discussed. This chapter is supplemented by Appendix A on chemistry, Appendix B on paint calibration and formulations, and Appendix C on paint recipes.