模型位姿变化对荧光油膜测厚精度的影响.docx
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摘要
基于紫外诱导荧光的油膜厚度测量方法已被广泛应用于风洞油流实验,但在动态风洞实验
中,承载荧光油膜的模型的位姿变化将会影响油膜厚度测量的精度。在紫外激发光源一次照
明与油膜直接成像场景中,对模型位姿变化带来的成像荧光强度误差进行了理论及实验分
析。研究了当被测模型发生平移和倾斜时,模型表面的辐照特性、接收荧光强度及成像接收
荧光强度的变化,并利用成像荧光强度误差来表征油膜厚度测量精度。分析结果表明,当模
型平移时,油膜厚度测量误差与平移距离有关,平移距离越大,误差越大。当模型小角度(-
4°~4°)倾斜时,油膜厚度测量的相对误差小于 1%。
Abstract
The method of oil film thickness measurement based on ultraviolet-induced fluorescence
technology has been widely used in wind tunnel oil flow tests. However, pose change of
the model bearing the fluorescent oil film will affect the accuracy of oil film thickness
measurement in dynamic wind tunnel tests. In the scene of primary illumination of
ultraviolet excitation light source and direct imaging of oil film, the error in the imaging
fluorescence intensity caused by the model pose change is analyzed theoretically and
experimentally. The changes in the radiation characteristics, received fluorescence
intensity, and imaging received fluorescence intensity of the model surface are
investigated when the measured model is translated or tilted. The accuracy of oil film
thickness measurement is represented by the error of the imaging fluorescence intensity.
The analysis results show that the error in the oil film thickness measurement depends
on the translation distance, and a longer translation distance results in a larger error
when the model translates. The relative error of oil film thickness measurement is less
than 1% when the model takes on a small-angle tilt (-4°--4°).
1 引言
当紫外光或波长较短的可见光照射到某些物质时,这些物质会发射出各种颜色和不同强度的
可见光。然而,当光源停止照射时,光线会随之消失。其中,在激发光源诱导下产生的光被称
为荧光
[1]
,相关的物质被称为荧光物质。荧光物质被激发光源照射后发出荧光的现象被称为
诱导荧光。诱导荧光技术可利用荧光的激发特性进行物体表面的流动测量,其具有显示直
观、成本低的优点。
诱导荧光技术已被广泛应用于生物
[2]
、化学
[3]
、环境
[4]
、食品
[5]
等多个领域中。除此之外,诱
导荧光技术还被用于内燃机可视化研究
[6-7]
、风洞中油流法流场显示技术研究
[8-10]
、火焰场
结构特性研究
[11-13]
等。基于诱导荧光的油膜厚度测量技术在这些应用与研究中扮演着重要
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