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HIGH-RESOLUTION THREE-COLOR PIV TECHNIQUE USING A DIGITAL SLR CAMERA

机译:数码单反相机的高分辨率三色PIV技术

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Particle image velocimetry (PIV) is used for measuring velocity distributions in planar cross sections of a fluid flow. The PIV technique is nonintrusive and not affected by variations in the fluid temperature. However, the velocity range and the accuracy of measurement are dependent on the spatial resolution of the camera. To overcome this limitation, a color digital single-lens reflex (SLR) camera and three illumination colors were used to simultaneously obtain two pairs of time delays. The three illumination colors, namely, red, green, and blue, were generated by diode lasers and had wavelengths of 650, 532, and 445 nm, respectively. Visualization images were obtained by a color digital SLR camera with color (red, green, and blue) pixel image grids. The uncertainty of the three-color PIV technique was evaluated using standard PTV images, and the technique was used to investigate the heat transfer and fluid flow characteristics of the natural convection produced by a vertical grooved panel heated on one side. The new color PTV technique was also used to measure a 3D velocity field by deforming the shape of the light sheet. The results confirmed the feasibility of using multiple cameras to develop a high-resolution 3D PTV system.
机译:粒子图像测速(PIV)用于测量流体平面横截面上的速度分布。 PIV技术是非侵入性的,不受流体温度变化的影响。但是,速度范围和测量精度取决于相机的空间分辨率。为克服此限制,使用了彩色数字单镜反光(SLR)相机和三种照明颜色来同时获得两对时间延迟。红色,绿色和蓝色这三种照明颜色是由二极管激光器产生的,分别具有650、532和445 nm的波长。可视化图像是通过具有彩色(红色,绿色和蓝色)像素图像网格的彩色数字SLR相机获得的。使用标准PTV图像评估了三色PIV技术的不确定性,该技术用于研究由一侧加热的垂直开槽面板产生的自然对流的传热和流体流动特性。新的彩色PTV技术还用于通过使光片的形状变形来测量3D速度场。结果证实了使用多台摄像机开发高分辨率3D PTV系统的可行性。

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