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Cerkno, Slovenia

Rejc J.,University of Ljubljana | Kovacic F.,ETA Cerkno | Trpin A.,ETA Cerkno | Rejc D.,ETA Cerkno | And 3 more authors.
Expert Systems with Applications | Year: 2013

The article describes the development and testing of a measurement and control system in industrial environment. This system enables fast and accurate membrane expansion measurements. The membrane is part of the sensor system called diastat, which is filled with a special oil. The diastat is part of mechanical capillary thermostat. To demonstrate the right selection of the measurement equipment and data processing methods, several tests and analysis were performed: the dynamic response of the diastat membrane during filling, measuring accuracy, nonlinearity and temperature stability of the measurement system with integrated distance sensor and the most important verification measurements with reference control procedures in manufacturing process. It was demonstrated that a number of novel approaches need to be introduced enabling installation of the measurement and control system in the production of the thermostat diastats. © 2012 Elsevier Ltd. All rights reserved. Source

Rejc J.,University of Ljubljana | Kovacic F.,ETA Cerkno | Trpin A.,ETA Cerkno | Turk I.,ETA Cerkno | And 4 more authors.
Expert Systems with Applications | Year: 2011

This article describes the automated visual inspection system for dimensional measurements of a mechanical assembly, called the protector, where an USB video camera with regular lens is used. A special user software was written. It uses a linear and a polynomial approximation for defining edges of selected protector structures. A higher order polynomial approximation is also used for pixel to metric units transformation. The accuracy, the repeatability and especially the usability of automated visual inspection system was verified with protectors, previously measured with the reference measurement method. The verification procedure showed that the measurement accuracy is in the range of ±0.02 mm. The time necessary for frame capturing, image processing and displaying the measurement results is less than a second. The comparison measurements showed that this system can not be used as a replacement for the current measurement system of monitoring switch-off temperatures in a oven. However, the presented visual inspection system can be used as a dimensional measurement and control system in the company testing laboratory. © 2011 Published by Elsevier Ltd. Source

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