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Non-intrusive pressure measurement based on ultrasonic waves

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To carry out the troubleshooting of hydraulic systems, pressure readings are often required to be taken at a number of temporary locations where the conventional instruments usually fail to make the necessary measurements from within the sealed pipes. The novel non-intrusive technique for the measurement of hydraulic pressure based on ultrasonic concepts offers the capability of making pressure measurements for troubleshooting without intruding into the pipeline. This has the advantage of not having an effect on the condition of the sealed hydraulic system and also of assisting rapid troubleshooting to save time and cost. Acoustic velocity in oil increases with pressure and the relative change in acoustic velocity over change in pressure is approximately 0.3% per MPa. The technique of this paper uses the neural networks to build an inverse model of the non-intrusive measurement system. This provides an effective means for direct digital readings of the measurand with an accuracy of 0.98%FS for a measuring range of 0–20 MPa. The established model can be used in an embedded instrument system based on an 8-bit or 16-bit microcontroller for non-intrusive monitoring.
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Document Type: Research Article

Affiliations: School of Engineering, Napier University, 10 Colinton Road, Edinburgh, EH10 5DT, UK

Publication date: May 1, 2005

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