Counter Gating Circuit for Acoustic Emission Monitoring of Structures Cracking under Repetitive Alternating Loads.

摘要

A circuit for gating the input to an electronic counter used in the acoustic emission monitoring of cyclically loaded propagating cracks is described. The circuit ensures that acoustic emission signals registered by the counter arise principally from propagating cracks and that the counting of extraneous signals such as those occurring as a result of rubbing and fretting of contracting surfaces are minimized. Keywords: Crack propagation; Acoustic emissions; Gating(synchronizing); Cyclic loads, Australia. (edc)