Abstract
AN ACOUSTIC EMISSION MONITORING SYSTEM DESIGNED TO DETECT, IN REAL TIME, INITIATION AND GROWTH OF CRACKS IN A COMPLEX STRUCTURE DURIING STATIC AS WELL AS FATIGUE TESTING HAS BEEN DEVELOPED. THE SYSTEM CONSISTS OF ARRAYS OF ACOUSTIC SENSORS, LOGIC CIRCUITS AND OUTPUT DEVICES. AN EFFECTIVE SPATIAL- AND FREQUENCY-FILTER COMBINATION PERMITS THE USE OF THE SYSTEM IN THE PRESENCE OF THE HEAVY BACKGROUND NOISE ORDINARILY ENCOUNTERED IN THE TESTING OF A LARGE, COMPLEX STRUCTURE. THE SYSTEM IS BEING USED SUCCESSFULLY IN STATIC AND FATIGUE TESTING OF FULL-SCALE AS WELL AS SMALL-SCALE SPECIMENS OF AIRCRAFT COMPONENTS AND STRUCTURES. /AUTHOR/
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