Affiliation:
1. University of Duisburg-Essen
Abstract
In ultrasonic gas flow metering the ultrasonic wave is complex modulated by natural or
artificial structures in the fluid. The determination of the shifted phase angle makes problems if the
limited range of the arctan-function is exceeded. It results in phase jumps and ambiguities of the phase
angle [1]. This paper presents a new method of phase angle determination which is called differential
procedure [2]. The differential procedure has been proved good to determine undersampled ultrasonic
data in a wider range of phase shift. The expanded range of phase angle is advantageous for vortex
measurement as well as for correlation measurement. Phase and amplitude modulation are physically
mutually connected. Phase modulation corresponds to frequency modulation and results in
connection with the receiving response of the ultrasound sensor in an additional nonlinear amplitude
modulation.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Reference4 articles.
1. V. Hans: Signal Processing of Complex Modulated Ultrasonic signals, Fluid Mechanics of Flow Metering, ed. W. Merzkirch, Springer, 5 (2005), 7 -94.
2. O. Ricken: Verarbeitung komplex modulierter Ultraschallsignale bei Wirbelfrequenz- und Korrelationsverfahren zur Durchflussmessung, PhD thesis, University of Duisburg-Essen, Shaker, (2007).
3. V. Hans, and E. v. Lavante: Vortex Shedding Flow Metering Using Ultrasound, Fluid Mechanics of Flow Metering, ed. W. Merzkirch, Springer, 5 (2005), 95-110.
4. Massa, Hingham, MA/USA. Datasheet E-188, www. massa. com/datasheets/e188. html.
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献