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To obtain accurate blood pressure measurements in clinical settings, especially when traditional methods are insufficient, healthcare professionals utilize the Doppler ultrasound technique. This method uses high-frequency sound waves to detect blood flow within the arteries, which is crucial for patients with conditions that complicate circulatory system assessment.
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Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
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Enhanced Flow Detection through a Steel Barrier using Doppler Ultrasound: a Numerical and Experimental Study.

Andreas Sørbrøden Talberg1, Cristiana Golfetto2, Tonni Franke Johansen2

  • 1Department of Electronic Systems, Norwegian University of Science and Technology, Trondheim, Norway.

Ultrasonics
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Summary

This study enhances hydrocarbon well integrity monitoring by improving Doppler ultrasound flow detection through steel. A novel ray tracing beamforming method significantly boosts signal detection, reducing environmental risks and operational costs.

Keywords:
Doppler ultrasound through steelNon-destructive testingRay tracing beamformingUltrasonic wave propagation

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Area of Science:

  • Geophysics
  • Materials Science
  • Acoustics

Background:

  • Hydrocarbon well leakages pose significant environmental and economic risks.
  • Effective detection of flow behind steel is crucial for oil and gas well integrity.
  • Current methods for detecting flow through steel barriers are limited.

Purpose of the Study:

  • To enhance flow detection using Doppler ultrasound through steel barriers.
  • To improve ultrasonic pulse beamforming for better signal penetration and accuracy.
  • To assess the integrity of oil and gas wells by detecting leakages.

Main Methods:

  • A ray tracing-based beamforming algorithm was developed and compared to a naive homogeneous medium approach.
  • Numerical simulations were conducted to evaluate beamforming performance.
  • Experimental setups were used to validate the techniques for flow detection behind steel.

Main Results:

  • Ray tracing beamforming increased peak amplitude by 5 dB in simulations by accounting for steel refraction.
  • The ray tracing method achieved a narrower, more focused ultrasonic beam.
  • Experimental results showed a 3-4 dB increase in flow signal power using ray tracing, enhancing detection.

Conclusions:

  • Ray tracing-based beamforming significantly improves Doppler ultrasound flow detection through steel.
  • This enhanced technique offers a more precise and sensitive method for oil and gas well integrity assessment.
  • The improved detection capabilities can mitigate environmental risks and reduce associated costs.