NDLI: Transducer-to-Transducer Communication in Guided Wave Based Structural Health Monitoring

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Transducer-to-Transducer Communication in Guided Wave Based Structural Health Monitoring

Content Provider	Semantic Scholar
Author	Moll, Jochen Marchi, Luca De Marzani, Alessandro
Copyright Year	2016
Abstract	Systems for guided wave (GW) based structural health monitoring are limited in the frequency bandwidth of the excitation signal due to the underlying wave's dispersion that causes a broadening of the waveform along the waveguide. Hence, bandlimited waveforms such as toneburst or chirp signals are widely employed. Recently, the authors have investigated the potential of phase-modulated signals, known from CDMA-communication systems, as a possible way to overcome such limitation. It was found that this class of excitation enables a parallel transmission and reception of all piezoelectric transducers which may lead to a significant reduction in the overall system complexity, because channel switching is not required anymore. In addition, the signal-to-noise ratio of the measured signal can be improved by considering phase modulation signals of longer code length. In this paper, we investigate phase-modulated signals in terms of their capability to transmit digital information on the health status of the structure through the structure itself. This may lead to autonomous GW-based SHM systems where the sensor nodes do not communicate with each other using radio frequency (RF) communication, but where the information are being delivered through the mechanical waveguide. A proof-of-concept will be demonstrated here on an isotropic plate using a Monte Carlo simulation. The implementation of the concept requires to compensate the guided wave signals from dispersion. Therefore, a suitable phase compensation designed on the group velocity of the GW-modes, is applied. Such transformation has two beneficial effects: 1) it compensates for the detrimental effect of dispersion, 2) it preserves the pseudo-orthogonality of the encoded pulses, because it is computed with a unitary operator.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://www.ndt.net/article/wcndt2016/papers/fr1h2.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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