Volume illumination for two-dimensional particle image velocimetry
Volume illumination for two-dimensional particle image velocimetry
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DOI：
10.1088/0957-0233/11/6/326
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发表时间：
2000-06-01
影响因子：
2.4
通讯作者：
Gray, MHB
中科院分区：
文献类型：
--
作者：
Meinhart, CD;Wereley, ST;Gray, MHB
在光学访问受限或微观几何形状的粒子图像测速实验中，可能需要用一定量的光（而不是二维光片）照亮整个测试部分。对于体积照明，测量平面的深度必须由记录光学器件的聚焦特性来定义。推导了二维测量平面深度的理论表达式，并且与实验观察结果吻合良好。位于测量平面之外的未聚焦的粒子图像会产生背景噪声，从而降低粒子图像场的信噪比。结果表明，必须明智地选择颗粒浓度，以平衡颗粒图像场所需的空间分辨率和信噪比。
In particle image velocimetry experiments where optical access is Limited or in microscale geometries, it may be desirable to illuminate the entire test section with a volume of light, as opposed to a two-dimensional sheet of light. With volume illumination, the depth of the measurement plane must be defined by the focusing characteristics of the recording optics. A theoretical expression for the depth of the two-dimensional measurement plane is derived and it is shown to agree well with experimental observations. Unfocused particle images, which lie outside the measurement plane, create background noise that decreases the signal-to-noise ratio of the particle-image fields. Results show that the particle concentration must be chosen judiciously in order to balance the desired spatial resolution and signal-to-noise ratio of the particle-image field.