RGB三波段消光法测量细微颗粒粒度分布研究  

Measuring Fine Particle Size with RGB Three Wavelength Bands Light Extinction Method

作　　者：黎石竹[1] 蔡小舒[1] 高伟[1] 刘浩[1] 

机构地区：[1]上海理工大学颗粒与两相流测量研究所,上海200093

出　　处：《光学学报》2015年第7期188-195,共8页Acta Optica Sinica

基　　金：上海市科委科研计划项目(13DZ2260900)

摘　　要：提出了采用彩色相机RGB信号实现三波段消光法测量微米级颗粒粒度分布的方法。当一束平行白光入射到弥散细微颗粒时,测量不同波长的透射光强信号,用多波长消光法理论反演可以测得被测弥散细微颗粒粒度。当用彩色相机拍摄透射光,得到的图像实际是RGB三个波段的透射光信号,该信号与相机的RGB响应曲线、光源光谱特性、被测颗粒粒径及颗粒浓度有关。对RGB三波段信号用消光法理论进行分析和反演计算,可以得到细微颗粒的粒度分布。通过数值模拟与实验验证,表明用彩色相机RGB三波段消光法可以测量亚微米到3 mm大小的颗粒粒度分布。将该方法与图像法颗粒粒度测量相结合,可以将彩色相机测量颗粒粒度的范围拓展到从亚微米到数百微米。A camera based RGB three wavelength bands light extinction for fine particle size measurement is proposed. When a particle system is illuminated by a parallel white light, the transmitted light of different wavelengths can be analyzed by the light extinction theory to calculate the particle size. Using a color camera as a detector, the transmitted light is recorded in RGB three wavelength bands. The recorded signal is related to the camera＇s RGB response curve, light source spectrum characterization, particle size and concentration. Analyzing the RGB three wavelength bands signal with the light extinction theory, the particle size distribution can be determined. The simulations and experiments are carried out. And the results show the feasibility of this method. This approach combining image measurement with the light extinction method, enable the camera based particle size measurement ranged from sub micrometer to hundreds micrometers.

关 键 词：测量 彩色相机 三波段消光法 RGB 颗粒粒度 

分 类 号：O439[机械工程—光学工程]