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该文介绍利用由2台相机构成的三维PIV成像系统记录流场的流动。实验首先通过标识框确定透视像距,实现两相机的标定,在暗室中将两相机快门常开,调节闪光灯以一定的频率曝光2次,使每一相机底片上同时记录下2个时刻的粒子图像。基于实验应用此三维PIV成像系统,对用透明有机玻璃制成的振荡流反应装置进行拍摄,获得一组记录粒子图像的图片,应用VC图片识别程序及MATLAB程序成功获得了反应器内某一瞬时的速度矢量图,证明此测速方法是可行的。
This article describes the flow of a flow field using a three-dimensional PIV imaging system consisting of two cameras. The experiment first through the identification box to determine the perspective from the perspective to achieve the calibration of the two cameras in the darkroom two cameras shutter normally open, adjust the flash exposure to a certain frequency 2 times, so that each camera film at the same time record the two time particles image. Based on the experimental application of the three-dimensional PIV imaging system, an oscillating flow reaction device made of transparent plexiglass was photographed to obtain a set of images for recording particle images. The VC image recognition program and the MATLAB program were used to obtain an instant Speed vector diagram to prove that this method is feasible.