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Cortical Bone Assessment Using Ultrasonic Guided Waves: A Reproducibility Study in a Healthy Population
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Continuous-wave ultrasound reflectometry for surface roughness imaging applications.

F G Mitri1, R R Kinnick, J F Greenleaf

  • 1Department of Physiology and Biomedical Engineering, Mayo Clinic, College of Medicine, Ultrasound Research Laboratory, Rochester, MN 55905, United States. mitri@ieee.org

Ultrasonics
|July 31, 2008
PubMed
Summary

Continuous-wave ultrasound reflectometry (CWUR) offers a new, non-contact method for measuring surface roughness. This technique accurately images micron-level irregularities with minimal error, outperforming traditional methods.

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Area of Science:

  • Materials Science
  • Non-Destructive Testing
  • Ultrasound Technology

Background:

  • Surface roughness is a critical quality indicator in manufacturing, but current measurement methods are often qualitative, time-consuming, and require direct contact.
  • There is a need for efficient, quantitative, and non-contact techniques for assessing surface irregularities caused by manufacturing, damage, or corrosion.

Purpose of the Study:

  • To introduce continuous-wave ultrasound reflectometry (CWUR) as a novel, non-contact method for imaging and measuring surface roughness.
  • To demonstrate the capability of CWUR for quantitative surface roughness assessment.

Main Methods:

  • Utilized continuous-wave ultrasound reflectometry (CWUR) to record and process voltage variations from reflected ultrasound waves.
  • Employed an ultrasound transducer (45 mm diameter, 70 mm focal distance, 3 MHz central frequency) to scan an acrylic test block.
  • Measured surface irregularities using a coordinate measuring machine (CMM) for comparison.

Main Results:

  • CWUR successfully generated images of surface roughness based on phase shifts in reflected ultrasound waves.
  • The CWUR technique demonstrated strong agreement with CMM measurements, with a maximum average percent error of approximately 11.5%.
  • The tested acrylic block exhibited surface irregularities ranging from 4.22 to 19.05 micrometers.

Conclusions:

  • Continuous-wave ultrasound reflectometry (CWUR) is a powerful non-contact tool for quantitative surface inspection.
  • CWUR enables effective imaging and measurement of micron-level surface irregularities with an average error below 11.5%.
  • This novel modality holds significant potential for nondestructive testing applications requiring precise surface characterization.