摘要
本文提出了应用于流场光学诊断的使用光偏振相移的数字剪切散斑干涉技术。它具有如下两个显著的优点。首先,产生干涉效应的两相干光束均是物光束。它们通过几乎相同的光学元件与几何空间。这样可以降低测量过程中对环境的防震要求,便于工程中的实际应用。其二,采用光偏振相移方法来获取干涉图上的位相信息,与通常使用的压电陶瓷(PZT)相移方法相比,不需要复杂的标定,使用更为方便。本文详细介绍了该技术的实验装置、基本原理以及对于二维流场与轴对称流场的实验数据处理方法,并给出了利用该技术获得的光学显示图象。
In this paper a digital shearing speckle pattern interferometry(DSSPI) using optical polarization phase shift for optical diagnostics in flow is proposed. It has two advantages. First, the two coherent beams are both objective beams which pass through a nearly same area in space. As a result, the DSSPI can be used under the harsh engineering environments. Second, the technique of the optical polarization phase shift is used to extract quantitatively the phase information from shearing speckle interferograms. Compared with PZT phase shifter, the optical polarization phase-shifter is more convenient because it does not need a complex calibration. The experimental arrangement, basic principle of DSSPI and optical polarization phase shift are all presented in detail. The methods of experimental data processing for two dimensional and axis-symmetrical flow fields are given. Last, the digital shearing speckle interferograms with polarization phase shift are visualized.
出处
《测试技术学报》
1998年第3期54-59,共6页
Journal of Test and Measurement Technology
