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Title: A multichannel correlation signal processor for flow measurement
Author: Keech, Ray P.
ISNI:       0000 0001 3596 2072
Awarding Body: Teesside Polytechnic
Current Institution: Teesside University
Date of Award: 1984
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To date, cross-correlation flowmeters have not achieved commercial importance, and this is believed to have been due primarily to oversimplified assumptions concerning the statistical nature of flow-derived signals. A detailed analysis of signals from flow modulated ultrasonic beams has led to a set of parameters and requirements that a correlation signal processor must satisfy for reliable measurement of flow velocity. This thesis describes these requirements and their implementation in a correlation signal processor. A new concept of 'multichannel' correlation is utilised, whereby further statistically independent data inherently present in the flow are correlated simultaneously to yield a multichannel correlation function. Theoretical analysis, supported by results, show that this technique gives a reduction in response time to changes of flow velocity. It also allows greater flexibility in transducer types and configurations to give improved flow interrogation. The design and theory of operation of the multichannel correlation signal processor is described, with particular emphasis on the analysis of practical correlation functions and the system response to nonstationary data processed under changing flow conditions. A new ultrasonic transducer configuration is described which significantly improves the accuracy, repeatability and reliability of an ultrasonic cross-correlation flowmeter by rendering insignificant the corrupting influence of ultrasonic reflections. A multichannel ultrasonic flow sensing head which incorporates this new configuration is described together with its associated signal processing electronics. Flow measurement results obtained from various single, two and multi-phase fluid flows are given.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Flowmeter signal processor ; Electric measurements ; Electronic measurements ; Fluid mechanics