颗粒测试在工业生产和科学研究中涉及的领域非常广泛,常用的颗粒粒度及其分布的测试方法是激光粒度测试法,其具有测试精度高、测量速度快、重复性好和可测粒径范围宽等突出优点.CCD传感器有灵敏度高、分辨率高、噪声小和较大的动态范围等优点,其作为激光粒度仪的探测器提高光强分辨率的应用已经很普遍了.为提高测量精度,通过对CCD传感技术的研究,应用图像处理的方法来设计光电探测器,搭建了基于米氏散射原理的激光粒度测试系统.实验结果表明,用CCD传感器采集光散射图像,再对图像进行处理,D50与D10误差在6％之内,D90误差在1％之内,降低了测量的重复误差.%Particle testing is widely involved in scientific research and industry. The frequently used examination method for particle size and distribution is laser particle size distribution test method,which owns especial advantages such as high precision,high speed, good repeatability and wide measuring range. It's a common trend that using CCD as the sensor of laser particle analyzer can improve the intensity resolution, because CCD sensor has the merits of high sensibility, high resolution, low noise and great dynamic range. For enhancing the measuring accuracy, using image processing technique to design detector was presented based on the study of CCD sensor technology,and a laser particle size analysing system was realized based on Mie scattering theory. The experimental results indicate that using the CCD sensor to capture the light scattering spectra of image and then using image processing techniques to design photode-tector enhance the measuring precision and reduce the repetition error effectively.
展开▼
