Research Center for Non Destructive Testing Gmbh

Research Center Pharmaceutical Engineering Gmbh

University of Kent at Canterbury

Michael Leitner

Adrian Podoleanu

Daniel Koller

Johannes Khinast

Daniel Markl

Guenther Hannesschlaeger

Stephan Sacher

Günther Hannesschläger

A method and a device for monitoring a property of a coating of a solid dosage form during a coating process forming the coating of the solid dosage form are provided. The device comprises a coating apparatus configured for forming the coating on the solid dosage form, and a monitoring apparatus configured for monitoring the property of the coating of the solid dosage form in process, wherein at least a part of the monitoring apparatus is located so as to have insight in an interior of the coating apparatus, the interior accommodating the solid dosage form to be coated and a precursor for forming the coating, and wherein the monitoring apparatus is configured for monitoring the property of the coating of the solid dosage form simultaneously with and during a coating process using low coherence interferometry.

Device and method for monitoring a property of a coating of a solid dosage form during a coating of the solid dosage form

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 the signal of a photodetector. Sound of different pitches are produced either directly in this process, or by using a nonlinear amplifier, or a mixer. For enhanced signal, the array may be driven by a nonlinear clock or the swept source may be driven by a distorted driving signal.

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

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Linz, Austria

Michael Leitner