Nonimmersion Pulse-Echo Acousto-Optical Imaging Nondestructive Testing System

摘要

The technique of Acousto-Optical Imaging (AOI) enables one to 'see', on a real-time basis, within optically opaque materials and to detect internal or surface flaws and/or other irregularities which might be present. The process uses an ultrasonic beam to probe the object under study. As it interacts with the object, the ultrasonic beam acquires an acoustical 'picture' of the object. This phase of the investigation was devoted to the design and construction of a nonimmersion pulse-echo acousto-optical imaging system. Using the nonimmersion pulse-echo acousto-optical imaging system, images of regular and irregular flaws in specimens were obtained to define the size of the smallest detectable flaw and to measure the accuracy with which depth of flaw can be determined. The report includes a description and operational characteristics of the nonimmersion pulse-echo acousto-optical imaging system. (Modified author abstract)