The development of optical computed tomography apparatus for fault detection on transparent materials

Suparta, Gede Bayu; Prawirosusanto, Sumartono; Natalisanto, Adrianus Inu

doi:10.1117/12.500898

Cited by 1 publication

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“…The imaginary refractive index may be beneficial for determining the quality of diamonds and crystals. Through the map of the imaginary refractive index, the internal cracks that fortunately define the uniqueness and the artistic feature of the diamonds or crystals may be studied [7]. The paper will first describe TL-CT theory, TL-CT simulation setup to create TL-CT artificial sinogram, and experimental setup to take TL-CT real sinogram of a circular cross-section uniform real-refractive-index object.…”

Section: Introductionmentioning

confidence: 99%

Preliminary study on the transmitted light tomography

Natalisanto

Suparta

Harjoko³

2009

SPIE Proceedings

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A tomography image of a transparent object has been developed. Through a tomography scanning procedure, an artificial and a real sinogram of transparent materials were developed. The artificial sinogram was used to test the concept of transmitted light tomography. The effect of reflection and refraction of light to the map of refractive index of transparent object is shown. A defect or faulty in transparent-material may appear as a deviation on the real-refractiveindex distribution. The real sinogram was developed using an object phantom made of glass and a tube of water. A set of projections or photographs was taken using a digital CCD camera. The object is rotated at a certain step then subsequently the picture of the object was captured. Then in similar manner, the next picture was captured until the scan covered 360 deg. From such set of pictures, a certain sinogram representing a certain cross-sectional was developed. Then, using a summation filtered back projection scheme, formally used in x-ray tomography, the cross-sectional of the object was developed. The results showed that it is possible to develop a transmitted light tomography for faulty detection as indicated by a change of refractive index in material.

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Section: Introductionmentioning

confidence: 99%