SYSTEMATIC ERROR OF ACOUSTIC PARTICLE IMAGE VELOCIMETRY AND ITS CORRECTION
SYSTEMATIC ERROR OF ACOUSTIC PARTICLE IMAGE VELOCIMETRY AND ITS CORRECTION
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DOI：
10.2478/mms-2014-0038
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发表时间：
2014-09-01
影响因子：
1
通讯作者：
Mickiewicz, Witold
中科院分区：
文献类型：
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作者：
Mickiewicz, Witold
粒子图像测速技术不仅在流体力学中用于湍流质量流的可视化，而且在线性和非线性声学中用于声学粒子速度的非侵入式可视化，越来越多地成为首选方法。低采样率（约15Hz）的粒子图像测速技术可以应用于使用与激励信号同步的采集来可视化声场。这种锁相PIV技术的描述和使用的实验中提出的文件。研究的主要目标是提出一个模型的PIV系统误差，由于非零的时间间隔之间的收购的两个图像的检查声场播种示踪剂粒子，什么影响复杂的声学信号的测量。所提出的模型的正确性，实验证实。校正程序，所提出的模型的基础上，应用于测量数据，增加了声学粒子速度场可视化的准确性，并创造了新的可能性，在观察多音调或带限噪声信号激发的声场。
Particle Image Velocimetry is getting more and more often the method of choice not only for visualization of turbulent mass flows in fluid mechanics, but also in linear and non-linear acoustics for non-intrusive visualization of acoustic particle velocity. Particle Image Velocimetry with low sampling rate (about 15Hz) can be applied to visualize the acoustic field using the acquisition synchronized to the excitation signal. Such phase-locked PIV technique is described and used in experiments presented in the paper. The main goal of research was to propose a model of PIV systematic error due to non-zero time interval between acquisitions of two images of the examined sound field seeded with tracer particles, what affects the measurement of complex acoustic signals. Usefulness of the presented model is confirmed experimentally. The correction procedure, based on the proposed model, applied to measurement data increases the accuracy of acoustic particle velocity field visualization and creates new possibilities in observation of sound fields excited with multi-tonal or band-limited noise signals.