Digital processing of complex modulated ultrasonic signals in flow measurement

Hans Volker

doi:10.1117/12.521888

2 September 2003 Digital processing of complex modulated ultrasonic signals in flow measurement

Hans Volker

Proceedings Volume 5253, Fifth International Symposium on Instrumentation and Control Technology; (2003) https://doi.org/10.1117/12.521888
Event: Fifth International Symposium on Instrumentation and Control Technology, 2003, Beijing, China

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.

Citation Download Citation

Hans Volker "Digital processing of complex modulated ultrasonic signals in flow measurement", Proc. SPIE 5253, Fifth International Symposium on Instrumentation and Control Technology, (2 September 2003); https://doi.org/10.1117/12.521888

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