Calibration of AE sensors using time reversal method

0438791 - ÚT 2015 RIV CZ eng A - Abstract
Kober, Jan - Převorovský, Zdeněk
Calibration of AE sensors using time reversal method.
11th European Conference on Non-Destructive Testing (ECNDT 2014). Brno: University of Technology, 2014. s. 147. ISBN 978-80-214-5018-9.
[European Conference on Non-Destructive Testing (ECNDT 2014) /11./. 06.10.2014-10.10.2014, Praha]
Institutional support: RVO:61388998
Keywords : acoustic emission (AE) * ultrasonic testing (UT) * time reversal * sensor calibration
Subject RIV: BI - Acoustics

So far, a calibration of acoustic emission sensors (and ultrasonic sensors in general) was possible either by a reciprocal calibration proposed by Hatano or by using an already calibrated reference sensor or vibrometer. These methods are however applicable only in laboratory conditions and require a special test specimen. Their results are only approximately transferable to practice, since the frequency response of sensors will change with bonding conditions and type of medium they are attached to. The paper shows a method of on-site calibration based on reciprocal calibration and using the time reversal method. The method was tested on a airplane wing flange specimen with six sensors attached to it. Initial experiments show promising results with low variability. Free boundary response of used sensors was measured by vibrometer and comparison of results shows some common features as expected.
Permanent Link: http://hdl.handle.net/11104/0242478