Laser Doppler velocimetry for three-dimensional distribution measurement of the velocity component by combining two-dimensional spatial encoding and non-mechanical scanning
Laser Doppler velocimetry for three-dimensional distribution measurement of the velocity component by combining two-dimensional spatial encoding and non-mechanical scanning
复制标题
DOI：
10.1364/ao.458743
复制
发表时间：
2022-07-01
期刊：
影响因子：
1.9
通讯作者：
Maru, Koichi
中科院分区：
文献类型：
--
作者：
Abd Ghafar, Sayyidatul N. A. B.;Yamaji, Haruto;Maru, Koichi
提出了一种用于测量三维空间速度分布的差动激光多普勒测速仪(LDV)。到目前为止，我们的常规研究已经提出了一些测量二维分布测量的方法。提出的方法之一是对布置在2D平面上的测量点进行空间编码。此外，我们还提出了一种基于非机械扫描的激光多普勒断面速度分布测量方法。提出了一种2D空间编码与非机械扫描相结合的3D方法，将分布在2D平面上的测量点以不同的偏置频率进行空间编码，并通过改变波长在另一个方向上对这些点进行非机械扫描。作为所提出方法的可行性研究，使用4×4通道光学装置进行了实验，并在1537-1553 nm的5个波长下进行了实验。实验结果表明，该方法能够成功地测量出速度分量的三维分布。在测量误差为2.8%~4.8%的范围内，成功地观测到了80个测点中的68个测点的拍频信号峰值和67个测点的拍频信号谱峰。(C)2022光学出版集团
We present a differential laser Doppler velocimeter (LDV) for measuring the velocity distribution in a three-dimensional (3D) space. Our conventional research so far has proposed some methods for measuring two-dimensional (2D) distribution measurement. One of the proposed methods was spatial encoding of measurement points arranged on a 2D plane. Besides, we also have proposed laser Doppler cross-sectional velocity distribution measurement based on a non-mechanical scanning method. We propose a 3D method by combining 2D spatial encoding and non-mechanical scanning, in which the measurement points distributed on a 2D plane are spatially encoded with different bias frequencies, and these points are scanned non-mechanically in another direction by changing the wavelength. As a feasibility study of the proposed method, experiments were conducted using a 4 x 4 channel optical setup and were performed at five wavelengths over 1537-1553 nm. The experimental results indicate that the proposed method could successfully measure the 3D distribution of the velocity component. The spectral peaks of the beat signals for 68 measurement points for the rotational speed of the target of 2.0 s(-1) and those for 67 measurement points for the rotational speed of -2.0 s(-1) out of 80 measurement points were successfully observed within the measurement error of 2.8%-4.8%. (C) 2022 Optica Publishing Group