A waveguide-based acoustic microscope

M. L. Peterson, S. Srinath, J. Murphy

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


A new instrument is presented which is capable of high resolution acoustic imaging at relatively low frequencies. This approach results in increased complexity of the signal processing required and reduced throughput of the instrument. However, these disadvantages are amply compensated by the ability to create velocity scan images of materials with either high attenuation or low material velocities. These measurements are not possible using traditional acoustic microscopes. The initial performance of the new instrument is demonstrated using thin samples of shim materials to show that acceptable spatial resolution and highly accurate time delay measurements are possible. An application is then shown using the instrument to evaluate subchondral sclerosis in horse bones. It has been hypothesized that changes in the elastic modulus may be associated with fatigue-induced microdamage. The modulus change may further represent bone damage which precedes the development of microcracking. Thin samples are used to allow complementary microradiography to be performed on the bone slices. Because of the low material velocity, surface wave interference methods (so called V(z) curves) are not well suited for use in some bone samples. The thickness of the samples eliminates the potential for the samples to be evaluated using pulse-echo time delay measurements. The new instrument is thus unique in its ability to create velocity scans of these samples.

Original languageEnglish
Pages (from-to)855-863
Number of pages9
Issue number8
StatePublished - Jul 1998

Bibliographical note

Funding Information:
This work was carried out with partial support from the National Science Foundation (Grant #BES- 9512236) with additional support from Colorado State University. Bone samples were prepared and pro vided by Dr. R.W. Norrdin, Professor of Pathology, Colt xado State University.


  • Acoustic microscopy
  • Bone properties
  • Cross-correlation

ASJC Scopus subject areas

  • Acoustics and Ultrasonics


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