AE Sensor Calibration for Out-of-Plane and In-Plane Displacement Sensitivity |
| Journal |
Advanced Materials Research (Volumes 13 - 14) |
| Volume |
Acoustic Emission Testing |
| Edited by |
R. Pullin, K.M. Holford, S.L. Evans and J.M. Dulieu-Barton |
| Pages |
91-98 |
| DOI |
10.4028/www.scientific.net/AMR.13-14.91 |
| Online since |
February, 2006 |
| Authors |
Pete T. Theobald,
F. Dar
|
| Keywords |
AE Sensor, Calibration, Sensitivity |
| Abstract |
This paper proposes a method for both the out-of-plane and in-plane displacement
sensitivity calibration of an acoustic emission (AE) sensor. In the method, a laser homodyne
interferometer is used to measure the out-of-plane and in-plane displacement of the surface of a
large test block excited by a repeatable source transducer. The out-of-plane displacement is
measured by aligning the laser beam perpendicular to the surface with time gating of the receive
waveform used to isolate only the direct arrival of the longitudinal wave produced by the piston
source transducer. For the in-plane displacement measurement, the laser beam is aligned parallel to
the surface to intersect a small optically reflective step with the time waveform being gated to
measure only the direct shear arrival produced using a normal incidence shear wave source
transducer. In each case, the interferometer measurement is followed by coupling the sensor under
test to the measurement surface, which is then exposed to the same acoustic field and the sensor
output signal measured. This substitution method allows the sensor sensitivity to be obtained in
terms of volts per unit displacement for both the out-of-plane and in-plane surface displacement.
The method allows a comprehensive description of an AE sensor response to different planes of
displacement and offers the potential for a traceable sensor calibration to units of length. |
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