A new method for the demodulation of ultrasonic signals for cross-correlation flowmeters |
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| Authors: | S.A. Jacobson P.N. Denbigh D.E.H. Naudé |
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| Affiliation: | Ultrasonic Process Control Division, Panametrics Inc, 221 Crescent Street, Waltham, MA 02254, USA;Central Acoustics Laboratory, University of Cape Town, Rondebosch, Republic of South Africa;Institute for Maritime Technology, PO Box 181, Simonstown 7995, Republic of South Africa |
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| Abstract: | Cross-correlation flowmeters using clamp-on ultrasonic transducers are particularly attractive for use in hostile or abrasive fluids. However, a phase difference is frequently found to exist between the envelopes of the received ultrasonic signals, which causes the correlation peak to become degraded, distorted, or even inverted. In this paper, an explanation for the phase errors is offered, and a new demodulation method, which eliminates these errors, is described. |
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| Keywords: | ultrasonics flow measurement signal processing |
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