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Proceedings Paper

Digital processing of complex modulated ultrasonic signals in flow measurement
Author(s): Hans Volker
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Paper Abstract

Many practical applications require special solutions for the digital demodulation of complex modulated signals. A typical example is the ultrasonic signal which is complex modulated by turbulent structures or vortices in the flow. The information about the modulation is in the sidebands of the signal which can be separated by undersampling. The most interesting phase angle can be detected by a 90 degree shifted sampling. This sampling can be extended to a shift of (n • 360 + 90) degrees. The zero point adjustment of the phase angle can be determined by the analysis of the density distribution function of the phase angle. In the case of very high modulation degrees extended Kalman filters have been proved good.

Paper Details

Date Published: 2 September 2003
PDF: 5 pages
Proc. SPIE 5253, Fifth International Symposium on Instrumentation and Control Technology, (2 September 2003); doi: 10.1117/12.521888
Show Author Affiliations
Hans Volker, Univ. of Duisburg-Essen (Germany)

Published in SPIE Proceedings Vol. 5253:
Fifth International Symposium on Instrumentation and Control Technology
Guangjun Zhang; Huijie Zhao; Zhongyu Wang, Editor(s)

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