Acoustic Microscopy of Old and New Materials

Briggs, G. A. D.; Daft, C.M.W.; Fagan, A. L.; Field, Thomas A.; Lawrence, Charles Wilson; Montoto, M.; Peck, S.D.; Rodríguez, Ana María Aparicio; Scruby, C. B.

doi:10.1007/978-1-4613-0791-4_1

Cited by 9 publications

(2 citation statements)

References 16 publications

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“…Subsequent studies showed how acoustic microscopy could reveal cracks in quartz grains in granite (Ilett et al, 1984), and also distinguish between different mineral phases (Briggs, 1985). Other studies also showed how acoustic micrographs of quartz grains in rocks relate to what can be seen in other materials (Hoppe & Bereiter-Hahn, 1985;Briggs et al, 1989). In this paper we present acoustic micrographs of two geologically common rocks whose geomechanical properties are very different, granodiorite (igneous) and limestone (sedimentary), and suggest the kind of information that can be obtained from them.…”

Section: R a Y L E I G H W A V E I M A G I N Gmentioning

confidence: 71%

Acoustic microscopy of rocks

Rodríguez-Rey

Briggs

Field

et al. 1990

Journal of Microscopy

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SUMMARY Acoustic images of two common rocks, granodiorite and limestone, are studied to explore the kind of geological information that they can provide. The contrast is primarily due to Rayleigh waves; in rock specimens they are mainly affected in their propagation by crystal anisotropy and surface discontinuities. Therefore, acoustic microscopy makes possible detailed identification of intragranular structures in the rock‐forming minerals (very fine cracks, grain and subgrain boundaries, etc.); these features may appear more sharply than in transmitted polarized light microscopy or in scanning electron microscopy. In particular the acoustic images are effective in microfractographic studies, they can show not only the finest cracks, even those much less than a wavelength wide, but also their position in relation to the grain and subgrain structure.

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Section: R a Y L E I G H W A V E I M A G I N Gmentioning

confidence: 71%

Acoustic microscopy of rocks

Rodríguez-Rey

Briggs

Field

et al. 1990

Journal of Microscopy

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“…To our knowledge, this work represents the first attempt to characterize fracture callus with a scanning acoustic microscope. Previously, the acoustic properties of various types of calcified tissue were investigated with scanning acoustic microscopy and, to date, most studies have used acoustic microscopy for the qualitative examination of bone (8,19,22,28,31,32). Hasegawa et al (15) utilized an acoustic microscope to measure the velocity of sound in biopsied human bone from normal and osteoporotic individuals and observed a significant decrease in the velocity of sound in the osteoporotic specimens.…”

Section: Discussionmentioning

confidence: 99%

Regional and temporal changes in the acoustic properties of fracture callus in secondary bone healing

Harten

Lee²,

Zimmerman³

et al. 1997

Journal Orthopaedic Research

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Controlled fractures were created in the right femora of 17 male Sprague-Dawley rats. The fractured limbs were harvested at 2, 4, 6, and 8 weeks after fracture, fixed, and embedded in polymethylmethacrylate. Midsagittal sections from each animal were evaluated with a scanning acoustic microscope, a device that generates an acoustic impedance map of the scanned material. The impedance of the fracture callus was measured in six regions on each specimen. These regions were chosen in an effort to distinguish between the impedance of the callus formed through intramembranous or endochondral ossification, and we found that the time course of increasing impedance differed for the fracture callus formed through the two pathways. Additionally, we found a significant difference in the mean impedance of the callus at each time period (p < or = 0.0013 for all comparisons), which resulted in an extremely linear relationship (r2 = 0.999) between mean callus impedance and healing time. This experimental model has become a popular choice for the investigation of fracture healing. As such, an accurate determination of the mechanical properties of the fracture callus is often sought. We propose that the implementation of scanning acoustic microscopy in the study of fracture healing may determine the changes in the material properties more accurately than conventional testing methods.

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