Evaluation on the Accuracy of an Inline Image-Based Method for Regular and Irregular Particles

Although the image-based method is considered to be the most direct and accurate measurement method compared to some other methods, there are some factors that add uncertainties to the measurements. In this study, a newly developed inline image-based method consisting of a telecentric vision probe and automatic particle identification software is evaluated by comparing with other recognized measuring technologies for regular and irregular particles. The subject technique provides pretty good repeatability for both regular (sigma D-50 = 0.65%) and irregular particles (sigma(D50) = 1.26%). From an engineering perspective, the measurement results of average diameters reveal the reliability of this image-based method. The maximum relative deviations are respectively 6.56% and 3.90% compared to the laser diffraction. Future work should be devoted to further improvement of the accuracy of this image-based method including contour identification, the particle shape-based reconstruction models, and the 3D image techniques based on binocular or multiple vision probes.