Title :
Signal processing of ultrasound modulated by gas flow
Author :
Hans, Volker ; Skwarek, Volker
Author_Institution :
Inst. of Meas. & Control, Essen Univ., Germany
Abstract :
Measurement of gas flow velocity with ultrasound by cross correlation functions were causing intensive investigations of complex modulated signals. The ultrasound signal is modulated in amplitude and in phase as well by various physical effects explained. The demodulation of the signal by undersampling and the separation of amplitude and phase modulated parts by Hilbert-transform are described. Cross correlation functions applied to these separated signals result in well defined measurements of flow velocity
Keywords :
Hilbert transforms; acoustic correlation; demodulation; flow measurement; flowmeters; ultrasonic applications; ultrasonic measurement; Hilbert-transform; amplitude modulation; complex modulated signals; correlation flowmeters; cross correlation functions; demodulation; gas flow velocity measurement; phase modulation; signal processing; ultrasound signal modulation; undersampling; Amplitude modulation; Demodulation; Fluid flow; Fluid flow measurement; Intensity modulation; Phase modulation; Signal processing; Ultrasonic imaging; Ultrasonic variables measurement; Velocity measurement;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 2001. IMTC 2001. Proceedings of the 18th IEEE
Conference_Location :
Budapest
Print_ISBN :
0-7803-6646-8
DOI :
10.1109/IMTC.2001.928879
