NDLI: Hockey stick developments extend range, improve accuracy of clamp-on flow measurements

Content Provider	IEEE Xplore Digital Library
Author	Dean, B.J. Lynnworth, L.C.
Copyright Year	1999
Description	Author affiliation: Panametrics Inc., Waltham, MA, USA (Dean, B.J.; Lynnworth, L.C.)
Abstract	The hockey stick (OKS) buffer waveguide for high-temperature clamp-on flow velocity measurements of hot water, 260°C, first reported in these Proceedings in 1996 and 1997, has evolved in response to the demands of new applications. Accuracy in some cases is needed not just at the temperature extremes but from room temperature to the extreme, requiring dynamic compensation for changes in sound propagation in the buffers. The operation of the OKS can be monitored by sensing overheating, sound speed distribution and coupling efficiency. Couplants for the -150° <;T<;360°C range must satisfy acoustic requirements and safety concerns. Metal foil couplants have been acceptable in most applications. Measurements of secondary flow have been made with clamp-on transducers, even at a location greater than 30 diameters from the nearest flow disturbance.
Sponsorship	Ultrasonics, Ferroelectr., & Frequency Control Soc
Starting Page	761
Ending Page	765
File Size	289767
Page Count	5
File Format	PDF
ISBN	0780357221
ISSN	10510117
DOI	10.1109/ULTSYM.1999.849511
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1999-10-17
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Fluid flow measurement Temperature distribution Ultrasonic transducers Temperature sensors Acoustic measurements Acoustic transducers Acoustic reflection Acoustic pulses Delay effects Velocity measurement
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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