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中文摘要：
颗粒存在于诸多领域中,对它们表征的测量和监测有着重要意义。数字影像测量技术是一种直观、非接触的测量方法,随着技术的发展得到了广泛的应用。然而在光学成像系统中,景深是有限的,如能对离焦模糊影像进行处理,就可以获得更大的测量区域。分别从仿真和实验两方面研究了球形颗粒离焦模糊影像的性质,证明了在一定离焦量范围,可以从模糊影像过渡区域中直径方向上两个最大梯度值得到颗粒的粒径。
英文摘要：
Particles exist in many areas,their characterization measurement and monitoring are of great importance.With the development of technology,digital image processing technique as a direct-viewing and non-contact measurement method has been widely used.However,in the optical imaging system,the depth of field is limited.In order to increase the measurement range,the defocus images should be processed.Defocus image of spherical particles were studied from simulation and experiment.It was proven that the gradient of image transition area and the defocus distance were related,and the difference of two maximum gradients along the radial direction was the particle diameter in image.
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HHT analysis of electrostatic fluctuation signals in dense-phase pneumatic conveying of pulverized c
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