Based on the interferometric particle imaging (IPI) technology, we present a method for comparison of aspect ratios of ellipsoidal particles. By simulating the interference in-focus and out-of-focus images of transparent ellipsoidal particles with different aspect ratios, we find that, under the same orientation angle, the larger the particle aspect ratio is, the higher the spatial frequency of the out-of-focus image. The IPI system is established to experimentally acquire the out-of-focus images of the transparent ellipsoidal particles. Because the experimental results agree with the simulation, we propose a method to compare the aspect ratios of ellipsoidal particles using out-of-focus images. The method features potential applications in particle measurements.

中文翻译：

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通过干涉散焦图像比较椭球形颗粒的长宽比

基于干涉粒子成像（IPI）技术，我们提出了一种比较椭圆形粒子纵横比的方法。通过模拟具有不同长宽比的透明椭圆形粒子的干涉聚焦和失焦图像，我们发现，在相同的定向角下，粒子长宽比越大，则离焦的空间频率越高。聚焦图像。建立IPI系统以实验性地获取透明椭圆体颗粒的离焦图像。由于实验结果与仿真结果吻合，因此我们提出了一种使用散焦图像比较椭圆形颗粒长宽比的方法。该方法在颗粒测量中具有潜在的应用前景。