An empirical study assessing the suitability of laser speckle patterns for use in experimental mechanics research conducted at hypersonic conditions is presented. Speckle patterns generated via coherent optical scattering from a gold-coated graphite surface inserted into a Mach 10 air stream were collected and analyzed using Computer-Aided Speckle Interferometry using two methodologies: a typical spanwise approach involving increasing temporal span between image pairs, and a sequential approach that utilizes a combination of temporal re-referencing and spatial resampling. Results were characterized for spatial-temporal stability and variance. Our observations demonstrate that optical methods relying on stable and properly formed speckle patterns can be used in a hypersonic regime at various Reynolds numbers and common camera frame rates, but the technique is sensitive to the conditions of the airflow and the processing methodology chosen.

提出了一项评估激光散斑图案在高超音速条件下进行的实验力学研究中的适用性的实证研究。通过从插入马赫 10 气流中的镀金石墨表面的相干光学散射产生的散斑图案，使用计算机辅助散斑干涉测量法收集和分析，使用两种方法：一种典型的跨度方向方法，涉及增加图像对之间的时间跨度，以及连续利用时间重新参考和空间重采样相结合的方法。结果的特征在于时空稳定性和方差。我们的观察表明，依赖于稳定和正确形成的散斑图案的光学方法可以用于各种雷诺数和常见相机帧速率的高超声速状态，