Title
Quantifying the performance of state of the art sensors to measure guided elastic waves
Author
van Groenestijn, G.J.A.
Jansen, T.H.
van Neer, P.L.M.J.
Jacobs, M.J.
Cheng, L.K.
Publication year
2018
Abstract
Elastic guided waves are carriers of information of the (change in) condition of plate-like structures like windturbine blades, airplane wings and road surfaces on bridges. To measure these guided waves we do not have to use piezos. Other sensors offer interesting benefits like contactless sensing, embedding, or measuring without electricity. However, quantitively comparing them is not trivial: the sensors all have different geometries, operating principles and are sensitive to different mode shapes of guided waves. We designed and performed an experiment to quantitatively compare the performance of five state of the art sensors (piezo, in-fiber interferometer, FBG, free-space interferometer, and ring resonator sensors) to measure S0 and A0 guided elastic waves. The measurements were performed on guided waves in an 8 mm steel plate, in the 60-150 kHz range. The dimensions of the plate and the positioning of the sources and sensors was chosen such that the S0 and A0 waves arrived in separate time windows. The in-fiber interferometer was the sensor that came closest to the piezo, that was used as reference sensor (-11 dB difference in SNR), the other optical based sensors have SNR values below -30 dB compared to the piezo. The measurements and simulations show that it is important to have two quantitative SNR measures for the performance to measure guided waves: one for the S0 and one for the A0 wave. For one sensor we found a difference of 22 dB between these two SNR measures.
Subject
High Tech Systems & Materials
Industrial Innovation
Ultrasound
Guided waves
A0 wave
S0 wave
Piezo
Fiber bragg grating
In-fiber interferometer
Ring resonator
Free-space interferometer
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http://resolver.tudelft.nl/uuid:2a148ee3-b3ad-4c4c-8f87-164751b7d5aa
TNO identifier
843861
Publisher
IEEE
Source
IEEE International Ultrasonics Symposium, IUS, 2018 IEEE International Ultrasonics Symposium, IUS 2018, 22 October 2018 through 25 October 2018
Document type
conference paper