Non-destructive analysis of tablet coatings with optical coherence tomography

Koller, Daniel; Hannesschläger, Günther; Leitner, Michael; Khinast, Johannes G.

doi:10.1016/j.ejps.2011.06.017

Cited by 78 publications

(62 citation statements)

References 34 publications

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“…However, it can be very effective in measurements of technical samples as well. Till now OCT OCT has been used: as a three-dimesional imaging technique for roll-to-roll coated polymer solar cells 7 , where it was used to identify coating defects in the functional layers; in observations of biofilm formation and growth on a water purification membrane 8 ; to anayse a tablet coating layers 9 . OCT has been also applied in measurements of liquid crystal displays (LCD) 10 .…”

Section: Optical Coherence Tomographymentioning

confidence: 99%

Detection of subsurface defects and measurement of thickness of screen layers made of graphene and carbon nanotubes with application of full-field optical coherence tomography in Linnik configuration

Mlynarska

Tomczewski²,

Pakuła

et al. 2015

SPIE Proceedings

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Optical coherence tomography (OCT) is noncontact and nondestructive interferometric method which allows visualization of internal structure of an investigated sample. Till now it has found many applications in measurements of biological tissues, technical materials and conservation of art. Optical coherence tomography in full-field configuration is a great technique for visualization of subsurface structures of measured sample with high resolution. In this technique, en-face data acquisition is applied, which allows application of microscope objectives with high numerical aperture while the depth of field is not a problem. These objectives allow obtaining ultra high transverse resolution like in traditional microscopy. Additionally, light sources with broad spectrum, like low cost incandescent lamps (i.e. halogen lamp), allow measurements with micrometer scaleaxial resolution.In this paper the authors present application of full-field optical coherence tomography with a Linnik microscope for the thickness measurement of layers in flexible display with electrodes made of graphene and carbone nanotubes. Thicknesses of layer have a huge impact on the display parameters. There is a correlation between the thickness of the graphene layer and its electrical resistance. Graphene is a new and very promising material which is durable, flexible and has a good adhesion to diverse substrates. It gives a theoretical possibility to create flexible electronics, such as graphene bendable screens. Using OCT we can evaluate the quality of printed layers and detect subsurface defects.

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Section: Optical Coherence Tomographymentioning

confidence: 99%

Detection of subsurface defects and measurement of thickness of screen layers made of graphene and carbon nanotubes with application of full-field optical coherence tomography in Linnik configuration

Mlynarska

Tomczewski²,

Pakuła

et al. 2015

SPIE Proceedings

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show abstract

“…Wiesner et al used ultra-high-resolution OCT system for in situ subsurface nondestructive examination of laser micro-machined surfaces [8]. Ultra-high-resolution OCT has also been used for non-destructive analysis of tablet coatings [9], sub-surface inspection of silicon integrated chips [10] and strain mapping [11]. In all these applications, OCT has been used for noninvasive characterization of dielectric and nonmetallic surfaces.…”

Section: Introductionmentioning

confidence: 98%

Optical coherence tomography for shape and radius of curvature measurements of deeply curved machined metallic surfaces: a comparison with two-beam laser interferometry

Rao

Udupa

Prathap

et al. 2015

Optics and Lasers in Engineering

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“…In order to be able to do so, the tablets had to be split before the measurement. Koller et al [9] as well as Zhong et al [10] applied optical coherence tomography as a further non-destructive method to determine coating thickness. Zhong et al [10] and Russe et al [11] used Terahertz pulsed imaging (TPI) for measurement of layer thickness.…”

Section: Introductionmentioning

confidence: 99%