Pressure sensitive luminophores for micro- and nano-systems

Experimental analyses of thermo-fluid phenomena of micro- and nano-flows with high Knudsen number need the measurement techniques based on atoms or molecules, such as emission and absorption of photons. The pressure sensitive paint (PSP) technique has the capability to be applied to high Knudsen number flows, such as micro-flows and low density gas flows. In this study, to inspect the feasibility of PSP for measurement of pressure on a solid surface in high Knudsen number flows, fundamental properties of three types of PSP [PdTFPP, PdOEP and PtTFPP bound by poly(TMSP)] are examined especially in the range of pressure below 1 Torr. The pressure sensitivity against nitrogen monoxide is also examined for the above PSPs, to develop a technique for the composite measurement of flow field structure and surface pressure, using NO-LIF and PSP, respectively. As an application of PSP to measurement in high Knudsen number conditions, we measure the pressure distribution on a jet-impinging small solid surface using PdOEP/poly(TMSP) with very high sensitivity.