A Conceptual Modeling Of Optical Properties Of Ruby Stone Using Charge-Coupled Device (CCD) Tomography Approach
Malaysia is one of the countries that imports rubies from Myanmar for various uses in the manufacturing industries, precious stone industries, dentistry, and medical applications. Previous tools for determining the gradation of ruby stones are based on the assessment by human eyes and require a l...
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| Summary: | Malaysia is one of the countries that imports rubies from Myanmar for various uses in
the manufacturing industries, precious stone industries, dentistry, and medical
applications. Previous tools for determining the gradation of ruby stones are based on
the assessment by human eyes and require a lot of experience. In this study, the research
presented a conceptual model of optical properties of ruby stones using the CCD
Tomography technique. The transparency and clarity of the ruby stones are some of the
important attributes that are evaluated in the study. The first objective of this present
study was to examine the optical properties of ruby stones using charge-coupled device
(CCD) tomography. The second objective was to investigate and identify the light
intensities of various grades of ruby stones using CCD tomography and Laboratory
Virtual Instrument Engineering Workbench (LabVIEW) programming software as
classified commercially by the Gemmological Institute of America (GIA) database. The
third objective was to validate the optical properties of the ruby stones by comparing
the simulation output images to that of the experimental output images. Here, the
research presented a standardized conceptual model for the optical properties of the
ruby stones using the CCD Tomography technique. A Linear Back Projection (LBP)
algorithm was used for reconstructing the 3D images of the ruby stones based on the
Refractive Index (RI) values of 1.762 and 1.770. The algorithm was programmed using
the LabVIEW programming software tools. These image reconstructions assisted in
analysing the transparency of the ruby stones after the 2-sample t-test, which were
necessary for evaluating and grading the stone quality. Apart from that, two types of
CCD tomography image reconstruction systems, with and without the use of a laser as
the light source, were analysed to investigate the best conceptual modeling with which
to evaluate the optical properties of ruby stones. The study suggested that the image
reconstruction system with laser as the light source or transmitter was efficient in
differentiating between the 2 different RI values of the ruby stones. The result also
concluded that the relative error value between the theoretical and experimental value
of this system is 10.15% which has successfully proved the capability of CCD
tomography system in evaluating the optical properties of ruby stone based on its
clarity. |
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