Lamb Wave Wireless Communication in Healthy Plates Using Coherent Demodulation

Guided ultrasonic waves are used in Non-Destructive Testing and Structural Health Monitoring for inspection and damage detection. Recently, wireless data transmission using ultrasonic waves in solid metallic channels has gained popularity in some industrial applications such as nuclear, aerospace and smart vehicles. The idea is to find a good substitute for electromagnetic waves since they are highly attenuated near metallic components due to Faraday shielding. The proposed solution is to use ultrasonic guided waves such as Lamb waves as an information carrier due to their capability of propagation for long distances. In addition to this, valuable information about the health of the structure could be extracted simultaneously. In this work, the reliable frequency bandwidth for communication is extracted experimentally from dispersion curves at first. Then, an experimental platform for wireless communication using Lamb waves is described and built. After this, coherent demodulation algorithm used in telecommunications is tested for Amplitude Shift Keying, On-Off Keying and Binary Phase Shift Keying modulation techniques. Signal processing parameters such as threshold choice, number of cycles per bit and Bit Rate are optimized. Experimental results are compared based on the average bit error percentage. Results has shown high sensitivity to threshold selection for Amplitude Shift Keying and On-Off Keying techniques resulting a Bit Rate decrease. Binary Phase Shift Keying technique shows the highest stability and data rate between all tested modulation techniques.

• Rudy Bahouth
• Farouk Benmeddour
• Emmanuel Moulin
• Jamal Assaad

• Lamb Wave Communication
• wireless communication
• coherent demodulation
• bit error percentage.

[1] S. J. Chapman, D. P. Hewett, and L. N. Trefethen, “Mathematics of the
faraday cage,” Siam Review, vol. 57, no. 3, pp. 398–417, 2015.
[2] Y. Jin, D. Zhao, and Y. Ying, “Time reversal data communications on
pipes using guided elastic waves: Part i. basic principles,” in Health
Monitoring of Structural and Biological Systems 2011, vol. 7984.
International Society for Optics and Photonics, 2011, p. 79840B.
[3] Y. Jin, Y. Ying, and D. Zhao, “Time reversal data communications
on pipes using guided elastic waves: Part II. Experimental studies,”
in Health Monitoring of Structural and Biological Systems 2011,
T. Kundu, Ed., vol. 7984, International Society for Optics and
Photonics. SPIE, 2011, pp. 104 – 114. (Online). Available:
https://doi.org/10.1117/12.880273
[4] S. Chakraborty, K. R. Wilt, G. J. Saulnier, H. A. Scarton, and P. K.
Das, “Estimating channel capacity and power transfer efficiency of a
multi-layer acoustic-electric channel,” in Wireless Sensing, Localization,
and Processing VIII, vol. 8753. International Society for Optics and
Photonics, 2013, p. 87530F.
[5] C. Kexel, M. M¨alzer, and J. Moll, “Guided wave based acoustic
communications in structural health monitoring systems in the presence
of structural defects,” in 2018 IEEE International Symposium on Circuits
and Systems (ISCAS). IEEE, 2018, pp. 1–4.
[6] C. Kexel, T. Maetz, M. Maelzer, and J. Moll, “Digital communication
across orthotropic composite components using guided waves,”
Composite Structures, vol. 209, pp. 481–489, 2019. [7] J. Moll, C. Kexel, and M. M¨alzer, “Complex intelligent structures with
data communication capabilities,” in Proceedings of the 9th European
Workshop on Structural Health Monitoring, Manchester, UK, 2018, pp.
10–13.
[8] J. Moll, L. De Marchi, and A. Marzani, “Transducer-to-transducer
communication in guided wave based structural health monitoring,” in
Non-Destructive Testing, 19th World Conf., 2016, pp. 1–8.
[9] L. De Marchi, A. Marzani, and J. Moll, “Ultrasonic guided waves
communications in smart materials: the case of tapered waveguides,”
in Structural Health Monitoring, 8th European Workshop, 2016, pp.
1–8.
[10] R. Bahouth, F. Benmeddour, E. Moulin, and J. Assaad, “Transmission of
digital data using guided ultrasonic waves in solid plates,” Proceedings
of Meetings on Acoustics, vol. 38, no. 1, p. 055008, 2019. (Online).
Available: https://asa.scitation.org/doi/abs/10.1121/2.0001142