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A Portable Digital Ultrasonic Holography System for Imaging Flaws in Heavy Section Materials

Invited Paper ‘ Abstruct-Ultrasonic holography has been shown to be avaluable technique for characterizing flaws in heavy section steels as used in pressure vessels and piping. It has not achieved popular success because of the cumbersome nature of the optical image reconstruction process used in the past. In this paper we describe a portable system that can be used in a field situation. Image reconstruction is accomplished mathematically in near real-time, and the image displayedin a variety of formats. The system utilizes a special purpose microcomputer designed around the 16-bit Intel 8086 and 8087 microprocessor chips. The system fits into three suitcase containers that can be shipped as excess baggage on most airlines. The system has been tested on pressure vessel and piping samples containing machined and natural flaws, and has also been used in the field to inspect a weld in the steam generator shell of a nuclear power plant. The theory, implementation, and experimental results will be presented.