Abstract

The correlation technique presented offers a good possibility for measuring the average rate of flow of fluids between the pipes. The physical parameter required for the measurement principle is the well known distance among the sensors. The new system described here consists of ultrasonic sensors, changing the natural pressure ,stochastic fluctuations of velocity and density into two signals with a real-time correlator and a delay time T and obtaining the delay time from the signals and calculating the average rate of flow of the fluid. In dissimilarityto established flow methods for measuring, no deceive bodies are essential and electrical conductivity of the fluid is not required. In this paper a detailed theoretical signal model describing the interaction of sound waves in random continuum and turbulent media will be presented. Measurements have been carried out with 27 mm pipe diameters for clamp-on transducers.

References

• Carlos Wilson Fernandes, Maria Dias Bellar, Marcelo Martins Werneck, "Cross-Correlation-Based Optical Flowmeter", IEEE Transactions On Instrumentation And Measurement, Vol. 59, April 2010.
• Coulthard J and Yan Y 1993 "Ultrasonic cross-correlation flowmeters" Meas. Control 26 164–7.
• M. Niemann and V. Hans, "Velocity dependent characteristics of modulated ultrasonic signal in gas flow," in Proc. IEEE Instrum. Meas. Technol. Conf. , Budapest, Hungary, May 21–23, 2001, pp. 554–559.
• L. Svilainis, P. Kabisius, S. Kitov, "Ultrasonic transit time flow meter for diesel: initial analysis", Issn 1392-2114 Ultragarsas, Vol. 65, 2010.
• E. Tahkola And M. Karras, "The Flowmeter For Water Using The Phase Modulation Of Ultrasonic Beams Analyzed By Cross-Correlation", in Proc. IEEE Ultrason. , 1984, pp. 488–492.
• A Worch," A clamp-on ultrasonic cross correlation flow meter for one-phase flow ", in Meas. Sci. Technol. 1998.
• Wael H. Ahmed and Based, "Innovative Techniques For Two-Phase Flow Measurements" Recent Patents on Electrical Engineering 2008, 1, pp. 1-13.