Method and apparatus for structural monitoring with acoustic emi

Details Method and apparatus for structural monitoring with acoustic emi Method and apparatus for structural monitoring with acoustic emi

1984-03-16

1985-08-20

Kreitman, Stephen A.

Measuring and testing

Vibration

By mechanical waves

364508, G01N 2904

Patent

active

045356297

ABSTRACT:
An acoustic emission monitoring system used for monitoring fatigue crack growth in metal or other materials such as occur, for example, in highway bridges during normal traffic loading. The transducers are placed on the plates to be tested to allow detection of acoustic emission from a particular site. By applying specific recognition methods to the acoustic emission AE, detection of flaws can be detected from a random noise background. The pattern recognition technique first subjects the received AE energy to an energy window test and if the energy is within the window, it is subjected to a rate test and if the energy exceeds predetermined rates, it is passed to a location test so as to locate the position of flaws.

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