Abstract
In terms of image degradation, one of the most serious problems encountered in low-frequency Bragg-diffraction imaging is caused by multiple acoustic reflections within the Bragg cell. The effect of these reflections can be reduced by frequency sweeping or by using properly-located acoustic absorbers. This paper discusses experiments in this regard and describes several different types of absorbers for a 3.58 MHz system.
Another source of substantial difficulty at the low frequencies is spherical aberration in the cylindrical converging lens used to form the laser beam. The design of such a lens and its effect on the system resolution are discussed.
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References
John Landry, Hormozdyar Keyani, and Glen Wade, “Bragg-Diffraction Imaging: A Potential Technique for Medical Diagnosis and Material Inspection,” Acoustical Holography, Vol. IV, ED. Glen Wade, Plenum Press, 1972.
Soo-Chang Pei, “Elimination of Bragg Image Speckle by Frequency Modulation,” August 1972, unpublished.
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© 1974 Springer Science+Business Media New York
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Keyani, H., Landry, J., Wade, G. (1974). Bragg-Diffraction Imaging: A Potential Technique for Medical Diagnosis and Material Inspection, Part II. In: Green, P.S. (eds) Acoustical Holography. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-0827-1_3
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DOI: https://doi.org/10.1007/978-1-4757-0827-1_3
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4757-0829-5
Online ISBN: 978-1-4757-0827-1
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