Abstract
To analyze micro/nano scale flows, we need to adopt a measurement technique in the molecular level. The pressure sensitive molecular film (PSMF) technique employs interaction between luminophores and oxygen molecules; hence it is suitable for pressure measurement in the flows. Previously, we researched the pressure sensitivity and the temperature dependence of PSMF. Typically, luminophores of PSMF are easily degraded by light and oxygen molecules, and it is very important to consider the photo-degradation in the measurement. In this study, we studied the photo-degradation of PSMF under two different pressure conditions to reveal the effect of oxygen molecules. Additionally, the time profile of the photo-degradation was measured. From the asymptotical behavior, it was clarified that the pre-illumination reduced the photo-degradation. We successfully obtained the pressure distribution of a micro-nozzle by pre-illuminated PSMF.
