Abstract
This paper presents the results of experiments that were performed to investigate the resolution capabilities of a Bragg imaging system using a cylindrically convergent light beam. The usual images formed with such a system show up as silhouetts of the objects being imaged. These silhouettes are superimposed on a light background, which constitutes the visual representation of the incident sound field. The Rayleigh criterion governs the resolution for thin cylindrical objects oriented parallel to the direction of the convergence line of the light beam. For orientation at right angles to this direction, the resolution is of quite a different character. The experimental resolution capabilities for both directions are presented in this paper and are compared with theoretical predictions. Resolution data is also presented for the case of dark-field imaging, i.e., where the objects appear as bright images on a dark background. In addition, experiments were performed to determine the loss of resolution resulting from the introduction of optically opaque plates between the scattering object and the light-sound interaction region.
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