Abstract
Scanning Laser Acoustic Microscopy (SLAM) is a high resolution imaging real-time technique, useful for nondestructive evaluation of solid materials and biological tissues. In SLAM operation, the sample surface may be parallel to the detecting plane (coverslip) or at an angle. Owing to the diffraction and the shadowgraphic nature of SLAM, when a defect inside the sample is a great distance from the detecting plane, it may be difficult to determine the size and characteristics of the flaw. Furthermore, when the sample surface and detecting plane are not parallel, the scattered wave needs to transmit through a nonuniformly thick water couplant-layer. A method of adjusting the complex wavefield at the detection plane and at the sample surface prior to conventional backpropagation is presented here with experimental results. The reconstructed image demonstrates that this method overcomes the restrictions of SLAM due to diffraction and the shadowgraphic nature of the images.
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References
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© 1988 Plenum Press, New York
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Yu, B.Y., Oravecz, M.G., Kessler, L.W., Roberts, R.A. (1988). Multimedia Holographic Image Reconstruction in a Scanning Laser Acoustic Microscope. In: Kessler, L.W. (eds) Acoustical Imaging. Acoustical Imaging, vol 16. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-0725-9_49
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DOI: https://doi.org/10.1007/978-1-4613-0725-9_49
Publisher Name: Springer, Boston, MA
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