公开(公告)号：US3919883A

公开(公告)日：1975-11-18

申请号：US44811574

申请日：1974-03-05

Applicant: GEN DYNAMICS CORP

Inventor： NAKAMURA YOSIO ,  VEACH CHARLEY L

IPC: G01H1/00 ,  G01N29/14

CPC classification number: G01N29/14 ,  G01H1/00

Abstract: An acoustic emission monitoring technique for detecting the growth or formation of cracks or other flaws in structures is disclosed. A growing crack emits acoustic signals which can be detected by an appropriate sensor on the structure surface. It has been found that the rate of amplitude buildup decreases as distance from a sensor to the site of the acoustic event increases. Thus it is possible by selecting only acoustic signals which have at least a selected build-up rate, to eliminate most background noise and other signals originating further than selected distance from the sensor. Thus, the formation and growth of cracks in the selected area can be accurately monitored in an acoustically noisy environment.

Abstract translation: 公开了一种用于检测结构中裂纹或其他缺陷的生长或形成的声发射监测技术。 越来越多的裂纹发出可以由结构表面上的适当传感器检测到的声信号。 已经发现，随着距离传感器到声学事件的位置的距离增加，振幅积累的速率减小。 因此，可以通过仅选择至少具有所选积累速率的声信号来消除大多数背景噪声和源自距离传感器的选定距离更远的其它信号。 因此，可以在声学噪声环境中精确地监测所选区域中的裂纹的形成和生长。