Characterization of Response Frequency for the Pressure-Sensitive Paint Based on Fluorine-Containing Polymer Matrixes Using Oscillating Sound Wave Technique.

Yun Shao,Qi Liao,Limin Gao,Heng Jiang,Liusheng Chen,Xigao Jin,Zhitian Liu

doi:10.3390/s20216310

Abstract

Five kinds of new homo-polymer and copolymers of methacrylate containing a fluorine ester group were synthesized and used for the binder of pressure-sensitive paint (PSP)to ensure the good compatibility between luminophore (Pt(II) meso-tetra (pentafluorophenyl) porphine (PtTFPP)) and polymer binder. In the work, we were concerned with how the structure of thesepolymers containing fluorine, especially the various ester group structure, affects the response frequency of PSP using oscillating sound wave technique. The results showed that the pressure sensitivities (Sp) of these PSP samples containing different polymers, exhibit some difference. The length of ester chain on the methacrylatepolymer affects the response frequency of PSP sensor layer composed of the polymer. The longer the chain length of the ester group, the higher the response frequency of the PSP sensor layer quenching by oxygen.

Highlights

The luminescence imaging combined with pressure-sensitive paint (PSP) is a novel method for measuring surface air pressure distribution on aerodynamic models in wind tunnel and other environments [1,2,3,4,5,6,7,8,9,10]
The response behaviors of the PSP based on fluorine-containing polymer matrixes were investigated in this article
We focused the effect of polymer binder structure on the response frequency of PSP

Summary

Introduction

The luminescence imaging combined with pressure-sensitive paint (PSP) is a novel method for measuring surface air pressure distribution on aerodynamic models in wind tunnel and other environments [1,2,3,4,5,6,7,8,9,10]. The PSP is comprised of the luminescent dye molecules dissolved or dispersed in polymer matrix. The working principle of this technique is when the PSP sensor film is illuminated at a wavelength which could be absorbed by the dye, it becomes electronically excited and fluorescence or phosphorescence emits at a longer wavelength. Oxygen is a powerful quencher for this emission, as oxygen diffuses into or out of the sensor layer, the extent of quenching changes and could be detected by the change in luminescence intensity or luminescence decay rate of the dye in the matrix. The oxygen quenching process depends directly on the concentration of oxygen presented in the test gas. The higher the concentration of oxygen in the test gas, the more energy will be dissipated through the oxygen quenching process

Methods

Results

Conclusion