高温射流中粒子测速的脉冲激光显微照像技术

为了获得高温射流中微粒的速度，建立了一套显微照像系统。该系统由双脉冲YAG激光光源、粒子放大成像系统、图像接收系统组成。在采用显微成像技术、补偿式滤光技术、序列成像技术后，克服了喷射粒子直径小、流场发光强、温度高等困难，实现了对同一粒子的两序列照像，根据两幅序列照片，获得了粒子的喷射速度。对该系统的组成、原理及试验结果进行了介绍。

Micrography technique of particle velocity measurement in the high temperature jet flow

In order to gain the particle velocity of high temperature jet flow, a set of micrography system was built. The system includes double pulse YAG laser, particle magnifying and imaging system, image incepting system. After using the technique of micrography, compensating filter, sequence imaging, which helped over- come the difficulties of small size of particle and flow field with violent irradiance and high temperature, the sequence photos of the same particle have been gotten. According to the photos, the particle velocity has also been obtained. In this paper, the principle, structures of the system and the experiment results were presented.