Unsteady pressure-sensitive paint measurement based on the heterodyne method using low frame rate camera
Unsteady pressure-sensitive paint measurement based on the heterodyne method using low frame rate camera
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DOI：
10.1063/1.4826085
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发表时间：
2013-10-01
影响因子：
1.6
通讯作者：
Niimi, Tomohide
中科院分区：
文献类型：
--
作者：
Matsuda, Yu;Yorita, Daisuke;Niimi, Tomohide
提出了一种基于外差法的压敏涂装技术，用于非定常流场的压力精确测量。该测量通过检测由调制照明光源和压力波动之间的干涉产生的拍频信号来实现。拍频信号由具有比压力波动频率低得多的帧速率的摄像机捕获。通过仔细调整光的频率和相机的帧速率，可以检测到感兴趣频率处的信号，同时消除其他频率处的噪声信号。为了验证所提出的方法，我们测量了谐振管中基波、二次和三次谐波的压力波动。成功地获得了压力脉动分布，并与压力传感器的测量结果相一致。该方法是测量非定常现象的一种有用的技术。(C)2013 AIP出版有限责任公司。
The pressure-sensitive paint technique based on the heterodyne method was proposed for the precise pressure measurement of unsteady flow fields. This measurement is realized by detecting the beat signal that results from interference between a modulating illumination light source and a pressure fluctuation. The beat signal is captured by a camera with a considerably lower frame rate than the frequency of the pressure fluctuation. By carefully adjusting the frequency of the light and the camera frame rate, the signal at the frequency of interest is detected, while the noise signals at other frequencies are eliminated. To demonstrate the proposed method, we measured the pressure fluctuations in a resonance tube at the fundamental, second, and third harmonics. The pressure fluctuation distributions were successfully obtained and were consistent with measurements from a pressure transducer. The proposed method is a useful technique for measuring unsteady phenomena. (C) 2013 AIP Publishing LLC.