Identification of cylindrical shells with sets of reinforcing ribs by their acoustic Bragg diffraction (grating) patterns

Donald Brill; Guillermo C. Gaunaurd

doi:10.1117/12.181016

29 July 1994 Identification of cylindrical shells with sets of reinforcing ribs by their acoustic Bragg diffraction (grating) patterns

Donald Brill, Guillermo C. Gaunaurd

Author Affiliations +

Proceedings Volume 2234, Automatic Object Recognition IV; (1994) https://doi.org/10.1117/12.181016
Event: SPIE's International Symposium on Optical Engineering and Photonics in Aerospace Sensing, 1994, Orlando, FL, United States

Abstract

We present a basic study of the acoustic Bragg diffraction patterns produced by gratings with various types of slits, which are insonified by (monochromatic) acoustic waves of various frequencies. Given the spacing in-between the slits, the (Bragg) angular diffraction pattern generated by the grating can be predicted by the method of physical optics (acoustics), and can be numerically evaluated for gratings with either uniformly or irregularly spaced slits. It has been already established that the diffraction patterns of planar gratings can be used to model the far-field scattering patterns produced by thin, cylindrical, elastic shells in water that have many reinforcing ribs. Varying the size and slit spacing (i.e., the ribs), the diffraction pattern becomes distorted, and for very irregularly spaced cases, the distortion is substantially asymmetric and noticeable. A number of graphs are shown to illustrate these points.

Citation Download Citation

Donald Brill and Guillermo C. Gaunaurd "Identification of cylindrical shells with sets of reinforcing ribs by their acoustic Bragg diffraction (grating) patterns", Proc. SPIE 2234, Automatic Object Recognition IV, (29 July 1994); https://doi.org/10.1117/12.181016

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