关键词: 原位检测, 消光法, 斑图成像, 图像特征分析

Abstract: It was difficult to on-line detect the sizes of fine particles that were prepared from industrial production processes. An on-line detection method was developed based on light scattering extinction to measure particle sizes. The law of image pixel value data of different sample particle concentrations under on-line detection was analyzed and discussed using image analysis and data feature analysis methods. Under the conditions of the in-situ experiments of the ball mill, the scattered light spot images were collected, which determined sample particle mass concentration within a certain particle size range. The difference of brightness of the light spot images was analyzed, and the distribution law of the minimum value of the pixel value was statistically obtained. The standard control parameter models were established for different particle size ranges and different sample concentrations. The models were verified by the sample particle liquid with known parameters, and the similarity matching degree is more than 0.95. The models were applied to in-situ measure fine particles sizes which were prepared by ball mill showing that the method may be used for the primary detection of in-situ particle sizes.

Key words: in-situ detection, extinction method, speckle imaging, image feature analysis