压力敏感涂料特性及其校准技术实验研究

Experimental Research of Pressure Sensitive Paint Performance and Calibration Technique

精细化的校准技术和涂料特性研究是影响压力敏感涂料(PSP)测量技术测量精度及其工程应用的重要因素。为此以PSP地面实验测量系统为主要平台,进行了国产PSP的静态校准和光降解实验,基于自主编制的PSP静态校准图像后处理程序研究了PSP压力、温度灵敏度之外所展现出的重要特性。研究结果表明:一定压力范围内,PSP的Stern-Volmer响应曲线呈现出较为明显的非线性,在校准中应采取高阶Stern-Volmer关系式进行拟合;在均匀压力和温度下,不同样片区域的校准结果呈现出空间不均匀性,这种不均匀性会影响PSP的校准精度;PSP存在光降解效应,其降解曲线在一定时间内近似为线性。同时,本文还简要分析了其产生机理以及对PSP测量精度的影响,初步提出了相应的评估指标及改进措施。

Calibration technique and paint performance research are critical for improving the measurement accuracy and engineering application of pressure sensitive paint（PSP）.In this paper,static calibration and photo-degradation experiments are performed based on a PSP static calibration setup and image post-processing software which is programmed independently to study paint performances other than its pressure and temperature sensitivity.The results of this study reveal that the Stern-Volmer curve of PSP exhibits a nonlinear characteristic rather than following the conventional linear pattern,which is approximated with an polynomial function using curve-fitting analysis.Moreover,calibration results of the painted coupon vary in space although the experiment is performed under uniform pressure and temperature,and it tends to decrease calibration accuracy.Finally,PSP demonstrates a photo-degradation characteristic and the degradation curve is approximately linear within a range of time.Evaluation indices of pressure response nonlinearity,calibration spatial non-uniformity and photo-degradation are proposed while their mechanims of production,influences on PSP measurement accuracy and correction methods are also presented.