Simultaneous Use of Multiple Human Senses to Actively Interpret NDE Signals for Improving the Precision of Process Control and Inspection

Abstract

Southwest Research Institute has developed technology for converting electronic signals generated by conventional nondestructive evaluation (NDE) equipment (i.e., ultrasonic, eddy current, and acoustic emission) into audible information so that the inspector can make use of both the conventional NDE signals (which are often confusing) and the audible information to make a flaw/nonflaw decision. The objectives of the program were to: (1) identify useful sound properties and to determine how they could be applied to NDE signal representation; (2) identify and evaluate aural data presentation methods which could be applied to typical NDE electronic signal information; (3) initially develop aural techniques for specific inspection scenarios for ultrasonic, eddy current, and acoustic emission methods; and (4) present the technical results of the research to the NDE community to encourage further development and use of aural capabilities of signal interpretation. The aural technology has been applied to composite impact damage, composite delamination detection, and corrosion detection. In addition, the aural technology was used to detect and discriminate intergranular stress corrosion cracking. Examples of application of aural NDE technology are described. An audio-visual presentation also was made during the paper presentation to demonstrate the technology to the audience.