An overview of different possibilities to master the challenge of coupling an ae-sensor to an object of interest partly using examples of previous investigations
An overview of different possibilities to master the challenge of coupling an ae-sensor to an object of interest partly using examples of previous investigations
Acoustic emission analysis is defined as a passive, non-destructive investigation method, which only listens for AEwaves (AEW), generated actively by an object of interest. Therefore, the AEW must have the possibility to propagate
from their source to an acoustic emission sensor (AES). By virtue of the piezoelectric effect, the AEW transmitted into
electrical signals inside of the AES. During the analysation of these electrical signals we earn –online– information
about the object of interest, e.g. the operating characteristic of a machine or the strength of the friction of a tribolocical
system. To enable the AEW to propagate into the AES, the sensor has to be fixed suitable onto the object of interest.
Hereby has to be strictly respected, that the sensor is fixed in a reproducible mechanical way as well as to ensure that
the through-transmission has a weak attenuation (couplant). Standard AES have the shape of a circular cylinder
(diameter and height depend on the operation purpose), the AEW pass through one of the frontends into the sensor. The
objects of interest can have different geometry of the surface (e.g. plane, cylindrical, unspecific) or temperatures which
usually conflicting the operating range of the sensor. Depending on the operational purpose, there are many different
couplants to use. This article offers help to master the different connecting challenges within the range of acoustic
emission analysis.
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