1. Michael Leitner

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    1. Mentioned In 18 Articles

    2. Calibration-free in-line monitoring of pellet coating processes via optical coherence tomography

      Calibration-free in-line monitoring of pellet coating processes via optical coherence tomography

      The paper presents a new in-line measurement technique for determining the coating thickness and uniformity of pharmaceutical pellets during film-coating in a fluid-bed apparatus. Non-destructive and contact-free process monitoring was performed via an optical coherence tomography (OCT) sensor providing cross-section images. Through the OCT measurements, the coating thickness could be determined directly, without a chemometric calibration model required for the quantification. The direct integration of the OCT sensor head into the fluid-bed systems allowed continuous monitoring of the coating growth. Moreover, the in-line investigation of the intra- and inter-pellet coating uniformity was possible due to OCT's high acquisition rate ...

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    3. The influence of glass fibers on elongational viscosity studied by means of optical coherence tomography and X-ray computed tomography

      The influence of glass fibers on elongational viscosity studied by means of optical coherence tomography and X-ray computed tomography

      We report on the flow characteristics of glass-fiber-reinforced polymers in elongational rheometry. Unlike polymers with geometrically isotropic fillers, glass-fiber-reinforced polymers exhibit flow behavior and rheology that depend heavily on the orientation, the length distribution and the content of the fibers. One of the primary objectives of this study was to determine the effect of fiber orientation, concentration and distribution on the entrance pressure drop by means of optical coherence tomography (OCT), full-field optical coherence microscopy (FF-OCM), and X-ray computed tomography (X-CT). Both pressure drop and melt flow were analyzed using a special elongation die (Thermo Scientific X-Die [3]) for inline ...

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    4. Apparatus and method of monitoring and measurement using spectral low coherence interferometry

      Apparatus and method of monitoring and measurement using spectral low coherence interferometry

      A spectral interferometry apparatus and method are disclosed, that can be used to monitor or measure an unknown length by following a characteristic of an indicating signal. The measurement is performed by adjusting an optical path difference (OPD) in an interferometer part of an interferometer configuration until sound or light or both are obtained with the desired strength and pitch. Embodiments are presented where the unknown length is the eye length. Spectral interrogation of the interferometer optical output is achieved by reading the signal of an analogue photodetector array in a spectrometer or by tuning a swept source and processing ...

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    5. Optical Coherence Tomography as a Novel Tool for In-Line Monitoring of a Pharmaceutical Film-Coating Process

      Optical Coherence Tomography as a Novel Tool for In-Line Monitoring of a Pharmaceutical Film-Coating Process

      Optical coherence tomography (OCT) is a contact-free non-destructive high-resolution imaging technique based on low-coherence interferometry. This study investigates the application of spectral-domain OCT as an in-line quality control tool for monitoring pharmaceutical film-coated tablets. OCT images of several commercially-available film-coated tablets of different shapes, formulations and coating thicknesses were captured off-line using two OCT systems with centre wavelengths of 830 nm and 1325 nm. Based on the off-line image evaluation, another OCT system operating at a shorter wavelength was selected to study the feasibility of OCT as an in-line monitoring method. Since in spectral-domain OCT motion artefacts can occur as ...

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    6. Feature Of The Week 3/10/13: Optical Coherence Tomography for Apple Surface Structure Evaluation

      Feature Of The Week 3/10/13: Optical Coherence Tomography for Apple Surface Structure Evaluation

      Worldwide a lot of effort is invested in delivering fruit of the highest quality to the consumer. This means that the fruit should look good, taste good and preserve these properties for a sufficiently long period of time after harvest in order for the fruit to be of commercial value. Of course many aspects need to be considered, but here we will focus on the function of the peel. The first thing that meets the eye of the consumer is the peel of the fruit, and in many cases this is the only quality criterion that the consumer uses to ...

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    7. First Symposium on OCT for Non-Destructive Testing (OCT4NT) held in Linz Austria a Success

      First Symposium on OCT for Non-Destructive Testing (OCT4NT) held in Linz Austria a Success

      On the 13 th and 14 th of February 2013 the RECENDT hosted the First International Symposium on Optical Coherence Tomography for Non-Destructive Testing – OCT4NDT ( www.oct4ndt.com ) in Linz, Austria. The event was attended by around 65 researchers and company delegates from all over the world (covering 18 different countries on five different continents). During 27 talks and a poster session the different research groups had the possibility to present their work in front of an interested audience. The OCT4NDT provided a platform for the discussion of new ideas and applications and for establishing new future collaborations. Therefore the ...

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    8. Announcing The First International Symposium on Optical Coherence Tomography for Non-Destructive Testing (OCT4NDT) February 13-14, 2013 Linz Austria

      Announcing The First International Symposium on Optical Coherence Tomography for Non-Destructive Testing (OCT4NDT) February 13-14, 2013 Linz Austria

      Optical coherence tomography (OCT) applications in the field of non-destructive testing (NDT) have grown immensely over the past few years. In order to pave the ground for a new OCT for NDT community we are pleased to announce the First International Symposium on OCT4NDT! The symposium is intended as a get-together for people working in this field and aims at initiating new ideas and projects. . For more information please click Here .

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  2. About Michael Leitner

    Michael Leitner

    Michael Leitner has been active in the field of OCT for several years. From 2010 - 2013 he was head of the OCT group at RECENDT. In 2013 he organized the first international symposium on OCT applications in the area of non-destructive testing (OCT4NDT). Currently he is working at Thorlabs.