Investigation of the Application of Coherent Acoustic Imaging to Nondestructive Testing

摘要

The purpose of this research program was to analyze and perform experimental demonstrations of the application of ultrasonic holographic and ultrasonic light diffraction techniques to the detection, analysis, and examination of the interval structure of optically opaque materials. A holographic scanner, operated in several modes, was used to produce more than 130 holograms, which were illuminated with a laser to reconstruct visible acoustic images. Several configurations of a Bragg diffraction microscope were used to produce comparison images. Techniques for real time computer constructed images were demonstrated. The report includes details of the analyses and experiments and indicates design approaches for practical nondestructive testing systems. (Author)