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首页> 外文期刊>Experiments in Fluids: Experimental Methods and Their Applications to Fluid Flow >3D particle measurements by single beam two-views magnified digital in-line holography
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3D particle measurements by single beam two-views magnified digital in-line holography

机译：通过单光束两视图放大数字在线全息图进行3D粒子测量

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摘要

Holography technique can be used for 3D measurement of particle positions. However, in general in-line holography, accurate determination of the object's position in the optical axis direction is difficult. In order to overcome this defect, we proposed a two-views recording technique combined with a digital in-line holography. The two-views recording is executed by only one camera with the assistance of one mirror, capturing the real image of a particle and the mirror image of the same particle simultaneously. This method keeps simplicity of optical alignment and is free from a difficult calibration of multiple cameras. It was confirmed that the proposed technique can reduce the uncertainty in the depth direction to about 1 pixel. For application of this method to micro-PIV, magnified recording is desired. In this paper, magnified holograms were also taken through a lens. It was confirmed that the uncertainty in the optical-axis direction can be reduced to a few pixels by the proposed technique for the magnified holograms.
机译：全息技术可用于粒子位置的3D测量。然而，在一般的在线全息照相中，难以准确地确定物体在光轴方向上的位置。为了克服此缺陷，我们提出了一种结合数字在线全息术的两视图记录技术。只能由一台摄像机在一个镜子的帮助下执行两次视图记录，同时捕获粒子的真实图像和相同粒子的镜像。该方法保持了光学对准的简单性，并且免除了对多个摄像机进行困难的校准的麻烦。证实了所提出的技术可以将深度方向上的不确定性减小到大约1个像素。为了将该方法应用于微型PIV，需要放大记录。在本文中，还通过镜头拍摄了放大的全息图。已经证实，通过所提出的用于放大的全息图的技术，可以将光轴方向上的不确定性减小到几个像素。

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