数字全息粒子图像测速技术(DHPIV)研究进展

RESEARCH ADVANCES IN DIGITAL HOLOGRAPHY PARTICLE IMAGE VELOCIMETRY

全息粒子图像测速技术(DHPIV)是当前非常具有发展潜力的非定常三维流场测量技术,是一种具有点空间分辨力的三维空间三维速度场和时间历程的实验观测方法和技术.本文介绍了该项技术(数字全息DH和粒子图像测速PIV)的发展背景和近20年来的研究进展,并介绍了已测得的非定常复杂流动的初步结果.详细论述了DHPIV技术所面临的关键性问题和应用基础问题以及相应的进展:粒子空间场的重建与再现的空间分辨率问题、粒子定位或位移精度问题、信噪比和数字再现的光学与快速算法以及测量空间的扩展等问题.同时讨论了数字离轴全息等有关技术的潜力,介绍了进一步的研究发展方向.

Digital Holography Particle Image Velocimetry is a very promising measurement technique for unsteady three-dimensional complex flow. This paper reviews the background and the research advances of this technology in the past two decades. Some key problems and application related problems （such as the reconstruction of the particle field, the resolution of reconstruction, the accuracy of the particle position and the displacement, the signal-noise ratio of the digital hologram, the optical method and fast mathematical algorithms for reconstruction, and the extension of measurement volume, etc.） are discussed. At the same time, we also discuss the potentiality of off-axis digital holography and point out the development direction in future. It is predicted that, with the rapid development of digital camera technique, DHPIV will become a new generation of the observation and measurement technology for unsteady three dimensional complex flows in the coming future, and will be used for difficult problems of fluid mechanics.