高速粒子场同轴Fraunhofer全息数据处理系统研究

介绍了用同轴Fraunhofer全息测量强动载下材料表面微喷射粒子场的数据处理方法.在全息像重建过程中，将再现的三维粒子场由计算机控制分成许多小薄层采集.在数据处理过程中根据图像中粒子边缘，决定在整幅图或局部采用边缘检测的方法提取大粒子，根据图像的灰度分布将图像分成很多小区域，在每个小区域采用不同的阈值分割图像.在处理结果的校正中根据粒子场的特点，去除过大、过小和重复统计粒子.采用该方法得到了粒子的空间分布图像及粒子大小的统计结果.

The Data Extracting System of High-Speed Particle Field Measurement Using In-line Fraunhofer Holography

In this paper, the data extracting method of high speed particle field ejected from material surface under explosion using in-line Fraunhofer holography was introduced. During the reconstruction, the image of the 3D particle field reconstructed from hologram was divided into many small slices and then these slices was acquired by a CCD camera. During the data processing, first of all whether in the whole or in some parts of the image extracting larger particles using edge detection based on the edge of particles in the image was determined, then the image was divided into several small areas and these small areas was segmented using a threshold. On the last process of correcting the result, the particles that was larger or smaller than a standard was confirmed as noise and that was repeatedly disposed were got rid of. Using this method, the space-distributing and the statistic of the particles were achieved.