Three-dimensional particle size and shape characterisation using structural light

Abstract

Great advance has been witnessed in image-based particle size and shape characterisation methods for reproducing traditional sieve-based size and caliper-based shape measurements. However, discrepancies still existed due to the limitations of image-based methods, which include the difficulty of obtaining the third dimensions from two-dimensional images, the errors caused by the internal textures of particles, and the particle shadows due to non-uniform illumination. This paper presents a simple, effective and inexpensive structural light technique for eliminating these limitations. This technique can determine three principal dimensions of many sand to gravel particles simultaneously and is less affected by particle internal textures and shadows. Eight hundred randomly selected soil particles with a range of sizes, colours, shapes and angularities were investigated using the structural light system to obtain their size and shape distributions. A remarkable agreement was found between the structural light results when compared with sieving analysis and manual measurement of shapes using calipers.

Evaluation of a Simple and Affordable Image-Based Procedure to Measure Particle Size Distribution

“…Several ways have been described previously to do that in imaging. Some of them use stereography (Zheng and Hryciw 2017), structured light (Sun et al 2019), or even tomography (Druckrey, Alshibli, and Al-Raoush 2016) to measure the third dimension. However, all of these methods involve more complex procedures than those included in the error evaluation that is done in this work.…”

The effect of the size and shape of wood particles on the tensile strength perpendicular to the plane of the particleboard: Experiments and modeling

“…Geometrically, an ellipsoid was chosen to model each particle. A more detailed discussion of the classification of particles can be found, for example, in articles [13,14].…”

An assessment of contact and laser-based scanning of rock particles for railway ballast

“…At a smaller scale, Barbieri and Silva [2] aims to establish lower cost photogrammetry with electron microscope of very small rock particles and compares it with well-established tomography and x-ray tomography [22]. Other authors [14] have employed 2D imaging to study shape evolution of railway ballast particles and propose new indices, structured light technologies [28] are also viable and deliver convincing results.…”