降低粒子成像测速中的像素锁定偏差

2017/07/18   下载量： 2 次

方案摘要

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应用领域 其他
检测样本 其他
检测项目
参考标准 暂无

采用LaVision公司独特研发的抑制像素锁定偏差滤光片可以有效降低粒子成像测速实验中的本底偏差。同时还发展了一种降低像素锁定偏差的后处理滤波器。

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A parametric study of the factors contributing to peak-locking, a known bias error source
in particle image velocimetry (PIV), is conducted using synthetic data that are processed
with a state-of-the-art PIV algorithm. The investigated parameters include: particle image
diameter, image interpolation techniques, the effect of asymmetric versus symmetric window
deformation, number of passes and the interrogation window size. Some of these parameters
are found to have a profound effect on the magnitude of the peak-locking error. The effects for
specific PIV cameras are also studied experimentally using a precision turntable to generate a
known rotating velocity field. Image time series recorded using this experiment show a linear
range of pixel and sub-pixel shifts ranging from 0 to ±4 pixels. Deviations in the constant
vorticity field (ωz) reveal how peak-locking can be affected systematically both by varying
parameters of the detection system such as the focal distance and f-number, and also by
varying the settings of the PIV analysis.
A new a priori technique for reducing the bias errors associated with peak-locking in
PIV is introduced using an optical diffuser to avoid undersampled particle images during the
recording of the raw images. This technique is evaluated against other a priori approaches
using experimental data and is shown to perform favorably. Finally, a new a posteriori anti
peak-locking filter (APLF) is developed and investigated, which shows promising results for
both synthetic data and real measurements for very small particle image sizes.

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北京欧兰科技发展有限公司
金牌会员 丨 第17年
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