El Rammouz H, Benmeddour F, Assaad J, Moulin E, Smagin N, Dupont L, Chehami L, Zaatar Y, Herro Z
Univ. Polytechnique Hauts-de-France, CNRS, Univ. Lille, ISEN, Centrale Lille, UMR 8520 - IEMN - Institut d'electronique de Microelectronique et de Nanotechnologie, DOAE - Departement d'Opto-Acousto-electronique, F-59313 Valenciennes, France; Lebanese University, Faculty of Sciences II, Laboratory of Applied Physics, Fanar, Lebanon.
Univ. Polytechnique Hauts-de-France, CNRS, Univ. Lille, ISEN, Centrale Lille, UMR 8520 - IEMN - Institut d'electronique de Microelectronique et de Nanotechnologie, DOAE - Departement d'Opto-Acousto-electronique, F-59313 Valenciennes, France.
Ultrasonics. 2021 Aug;115:106430. doi: 10.1016/j.ultras.2021.106430. Epub 2021 Apr 23.
In this paper, a new approach is proposed for the detection of ultrasonic guided waves using a LiNbO single crystal-based micro-transducer matrix. This matrix was designed, manufactured, and then used to detect Lamb and Pochhammer-Chree guided waves in plate- and cylinder-like structures. This study highlights the identification of the first flexural mode F(1,1) in cylinders at low frequencies. A network analyser and a laser Doppler vibrometer (LDV) were used to characterise and study the behaviour of the micro-transducer matrix. An experimental device was designed and used to acquire electrical measurements of the micro-transducer vibrations. Then, an original experimental device was developed to generate a selected flexural guided mode in a solid aluminium cylinder. The emitter comprised two semicircular piezoelectric transducers excited with only one phased signal thanks to the inverse position of polarisation. Finally, the results prove that the flexural mode F(1,1) is selected and generated by the emitter, then detected and identified by the micro-transducer matrix.
本文提出了一种利用基于铌酸锂单晶的微换能器矩阵检测超声导波的新方法。设计并制造了该矩阵，然后用其检测板状和圆柱状结构中的兰姆波和泊松-克里波导波。本研究着重于在低频下识别圆柱中的一阶弯曲模态F(1,1)。使用网络分析仪和激光多普勒振动计（LDV）来表征和研究微换能器矩阵的行为。设计了一种实验装置，用于获取微换能器振动的电学测量值。然后，开发了一种原始实验装置，以在实心铝圆柱中产生选定的弯曲导波模态。发射器由两个半圆形压电换能器组成，由于极化的相反位置，仅用一个相位信号激励。最后，结果证明弯曲模态F(1,1)由发射器选择并产生，并由微换能器矩阵检测和识别。
