共轴两焦面探测信号的激光粒度测试  

Laser particle size measurement by detecting signals on two coaxial focal planes

作　　者：葛宝臻[1] 魏永杰[1] 吕且妮[1] 

机构地区：[1]天津大学精密仪器与光电子工程学院光电信息技术科学教育部重点实验室,天津300072

出　　处：《光电工程》2007年第7期35-38,共4页Opto-Electronic Engineering

基　　金：国家自然科学基金资助项目(60527002)

摘　　要：为了提高激光粒度仪测量宽分布范围粒径的能力，根据衍射原理，提出扩大测试动态范围的方法。该方法使用共轴的双透镜，在两个焦平面同时探测信号，将这些信号合成后经数据处理得到粒子尺寸分布。模拟计算表明，使用两个100mm焦距的透镜和两个32环的多元探测器可测量粒径为1-2000μm的颗粒，动态范围为2000：1。这种方法在不需更换镜头、不改变探测器轴向位置的情况下可以测量较大量程内的粒径分布。In laser particle size measurement, it is preferable to enhance the performance of measuring widely distributed particle size. Based on diffraction theory, a laser particle size measurement scheme is proposed to extend the measurable size range at one time, In this project, two lenses are set coaxially and signals are detected on the back focal plane of the first lens and the combined back focal plane of the two lenses at the same time. Particle size distribution is obtained when signals are integrated and inverted with an independent model algorithm. Simulation result shows that particles in the range of 1-2000 μm can be measured simultaneously, and the measuring dynamic range is 2000：1 when the focal lengths of the two lenses are both 100 mm and the two sets of detectors have both 32 rings, The presented method can be applied to measure particle size distribution with large range, Meanwhile, it is unnecessary to change lens or move detectors.

关 键 词：激光粒度测试 动态范围 两焦平面探测 信号合成 

分 类 号：TM930.126[电气工程—电力电子与电力传动]