Articles | Volume 6, issue 1
J. Sens. Sens. Syst., 6, 9–18, 2017

Special issue: Sensors and Measurement Systems 2016

J. Sens. Sens. Syst., 6, 9–18, 2017

Regular research article 10 Jan 2017

Regular research article | 10 Jan 2017

Ultrasound tomography for inline monitoring of plastic melts

Norbert Halmen et al.

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Cited articles

Alig, I., Lellinger, D., Lamour, R., and Ramthun, J.: Inline Monitoring in the Extrusion Process Using Ultrasonics: Continuous Monitoring of Quality Parameters, Kunststoffe international, 5, 31–33, 2000.
Alig, I., Fischer, D., Lellinger, D., and Steinhoff, B.: Combination of NIR, Raman, Ultrasonic and Dielectric Spectroscopy for In-Line Monitoring of the Extrusion Process, Macromol. Sy., 230, 51–58,, 2005.
Alig, I., Lellinger, D., Steinhoff, B., and Fischer, D.: Filler Dispersion: Ultrasonic Spectroscopy for In-Line Monitoring, Kunststoffe international, 5, 60–65, 2006.
Deutsch, V., Platte, M., and Vogt, M.: Ultraschallprüfung: Grundlagen und industrielle Anwendungen (ultrasonic testing: principals and industrial applications), Springer publishing house, Berlin, Germany, 1997.
Dinger, F.: Ultraschallverfahren für Prozesskontrolle und Qualitätsüberwachung (Ultrasonic method for process control and quality monitoring), Plastverarbeiter, 11, 92–94, 2007.
Short summary
An ultrasound process tomography system has been developed, which enables the imaging of the local filler distribution in plastic melts. The objects investigated were extruded rods made of polypropylene (PP) with radial filler gradients. During extrusion, sound velocity and attenuation of the plastic melt were determined and processed via a modified reconstruction algorithm according to Radon transform into 2-D sectional images.