Oxygen quenching of luminescence of pressure sensitive paint for wind tunnel research
Oxygen quenching of luminescence of pressure sensitive paint for wind tunnel research
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DOI：
10.1021/ed074p697
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发表时间：
1997-06-01
影响因子：
3
通讯作者：
Gouterman, M
中科院分区：
文献类型：
--
作者：
Gouterman, M
提出了一种基于氧猝灭发光的风洞翼型升力测量方法。将被氧淬灭的发光二极管溶解在含有可透氧聚合物和挥发性溶剂的涂料中。油漆被喷涂以形成机翼表面的涂层。光激发发射的强度取决于表面的有效氧压。在气流过程中，这种情况会减少，辐射会变得更亮。在静止空气中采取的发射强度的CCD相机图像的比率，以采取气流期间提供了在翼型表面的压力图。这是由Stern-Volmer方程给出的：Io(x,y)/I(x,y) = A + B（pxy/po）其中Io（x,y）是在压力为po的静止空气中在x，y点测量的强度，I（x,y）是气流中同一点的强度，pxy是气流中该点的压力，A和B是校准常数。所选择的发光物质是一种铂卟啉，它在近紫外线下被激发并在650纳米处发出磷光。该方法最严重的问题是，发射强度也依赖于温度。
A technique for measuring the lift on airfoils in wind tunnels has been developed based on oxygen quenching of luminescence. A luminophor that is quenched by oxygen is dissolved in a paint containing polymer that is oxygen permeable and a volatile solvent. The paint is sprayed to form a coating on the airfoil surface. The intensity of photo excited emission depends on the effective oxygen pressure over the surface. During airflow this is reduced and the emission gets brighter. The ratio of a CCD camera image of the emission intensity taken in still air to that taken during airflow provides a map of the pressure on the airfoil surface. This is given by the Stern-Volmer equation: Io(x,y)/I(x,y) = A + B(pxy/po) where Io(x,y) is the intensity measured at point x,y in still air at pressure po, I(x,y) is the intensity at the same point during airflow, pxy is the pressure at that point during airflow, and A and B are calibration constants. The luminophor of choice was a platinum porphyrin that is excited in the near uv and emits a phosphorescence at 650 nm. The most serious problem with the method is that the emission intensity is also temperature dependent.