Improvement of Background Oriented Schlieren Method Focused on Amplitude of Wavelet Transform

Improvement of Background Oriented Schlieren Method Focused on Amplitude of Wavelet Transform
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以小波变换幅度为中心的背景导向纹影法的改进

DOI:
10.1088/1757-899x/886/1/012037
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发表时间:
2020
期刊:
IOP Conference Series: Materials Science and Engineering
影响因子:
--
通讯作者:
Hiro Kazuki
Hiro Kazuki
中科院分区:
--
文献类型:
--
作者:
Miyaoku Koki;Fukuoka Hiroshi;Nakamura Shigeto;Yao Masanori;Hiro Kazuki

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BOS方法是一种流场中密度变化的可视化方法。这种方法比纹影法更简单,可视化成本更低。本研究的主要目的是提出WA-BOS(一种更简单的聚焦于小波变换幅度的BOS方法)。将WA-BOS和WP-BOS(聚焦于小波变换相位的BOS方法)输出的图像与纹影图像进行比较,以验证输出图像的有效性。同时,对采集到的图像丢失周期信息的输出图像进行了部分验证,以验证图像处理对偏离相位域的有效性。可视化的对象是超音速射流和激波管喷出的激波。测量系统由LED、正弦图案背景图像和高速摄像机组成。结果表明,在WA-BOS和WP-BOS得到的可视化图像中,可以看到超音速射流和激波从激波管中喷出。此外,研究还发现,WA-BOS可以在不包含误差的情况下可视化超音速现象。
The BOS method is a visualization method of density variation in the flow field. This method is simpler and cheaper to visualize than the Schlieren method. The primary purpose of this study is to propose WA-BOS (a simpler BOS method focusing on the amplitude of the Wavelet transform). Output images by WA-BOS and WP-BOS (BOS method focused on the phase of the Wavelet transform) and the Schlieren image were compared to verify the validity of the output images. Also, output images by the captured image lost periodic information partially were verified, in order to confirm the validity of the image processing for the deviation out of the domain of phase. The targets of visualization are the supersonic jet and the shock wave ejected from the shock tube. The measurement system consists of an LED, a sine pattern background image and a high-speed camera. As a result, the supersonic jet and the shock wave ejected from the shock tube are visible in the visualized image that was obtained by WA-BOS and WP-BOS. Moreover, it is found that WA-BOS can visualize a supersonic phenomenon without containing an error.
使用太阳能钙 K 线背景导向纹影实现地对空气流可视化
DOI: --
发表时间: 2016
影响因子: 2.4
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