For several decades the field of engineering geology, has had several difficulties to characterize properties of
sedimentary particles. These particles are characterized by a multitude of sizes and shapes. For measuring the sizes
there are a number of instruments based on different principles. However, the use of these instruments is not very
widespread. The size of sediment particles covers several orders of magnitude therefore, the instruments have been
developed do not meet all requirements. Several authors have demonstrated the feasibility to perform these tests by
means of digital image processing. In this paper we propose to obtain optical particle size, morphological analysis and
density, in a range of 30 microns to 50 mm. To this end we propose two assemblies that cover the range of sizes. In the
proposed assembly is used as transport fluid particles. The fluid and allow a mechanism to disperse the sample, this
solves the problem of segmentation in digital image processing. It uses a back-illuminated light for accurate
measurement of particles due to the complexity of its component phases. By digital image processing can be 41
measurements on each particle. Furthermore allows morphological analysis using the Fourier method. A tracking
algorithm to determine the density of the particles according to Stokes' law. Experiments demonstrate the accuracy and
repeatability of this method compared with other methods of measurement.
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