Abstract
This paper reports a new technique for the visualization of ultrasonic interference in solids. The technique utilizes small (≈ 1 μm) polystyrene spheres suspended in a very thin liquid film formed on the surface of the solid. The nonlinear response of this film to acoustic waves is such that the spheres reveal the interference pattern present at the surface. There are two important advantages to this technique. The first is the simplicity of the technique, no elaborate equipment is required. The second is the easing of restrictions on ultimate resolution by our ability to visualize ultrasonic interference in solids.
We demonstrate the capability of obtaining a linear hologram resolution of 16 urn at a sensitivity on the order of 10-4 watts/cm2 to 10-3 watts/cm2. We also present the optical reconstruction of a mesh from an acoustic hologram. The resolution shown in the reconstructed image is approximately 380 μm with a magnification approaching 50 X.
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References
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© 1972 Plenum Press, New York
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Cunningham, J.A., Quate, C.F. (1972). Acoustic Interference in Solids and Holographic Imaging. In: Wade, G. (eds) Acoustical Holography. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-8213-7_36
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DOI: https://doi.org/10.1007/978-1-4615-8213-7_36
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4615-8215-1
Online ISBN: 978-1-4615-8213-7
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