Near Stochiometric LiNbO3 Crystal: the Piezoelectric Features and the Shear Horizontal Guided Wave Transducer for Structural Health Monitoring Up to 650 °C.

Guoliang Wang,Fulei Wang,Linfang Xie,Dongzhou Wang,Wei Song,Yuanhua Sang,Hong Liu,Xian Zhao,Fapeng Yu

ACS APPLIED MATERIALS & INTERFACES（2024）

Shandong Univ | Jinan Inst Quantum Technol | CETC Deqing Huaying Elect Co Ltd

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Abstract

The application of shear horizontal (SH) guided wave transducers in high-temperature structural health monitoring (SHM) is a topic of significant interest across various industrial engineering sectors. In this study, we utilized the novelty piezoelectric crystal of near stoichiometric lithium niobate (NSLN), which exhibited a robust piezoelectric response (d 15 = 77.6 pC/N@room temperature). Next, the pure thickness shear vibration mode d 15 ' through size optimization was designed. It was demonstrated that the NSLN-based ultrasonic guided wave transducers utilizing the optimum d 15 ' mode were proficient in transmitting and receiving pure fundamental SH wave (SH0 wave) along two orthogonal main directions (0 degrees and 90 degrees) over a wide frequency range (100-350 kHz), exhibiting strong response to the SH0 wave. Under the driving voltage of 100 V, the signal voltages of the NSLN-based transducer were found to be on the order of 200.3 and 11.8 mV at room temperature and high temperature of 650 degrees C, respectively. Moreover, the NSLN-based SH0 transducer showcased its better defect localization ability, and the signal-to-noise ratio (SNR) sensitivity of NSLN-based transducer was evaluated to be 16.1 dB at high temperature of 650 degrees C. To sum up, the ultrasonic wave transducer based on NSLN crystal demonstrated higher potential applications for in situ SHM under elevated temperatures.

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Key words

NSLN crystal,high piezoelectric performance,SH0 ultrasonic guided wave transducer,defectlocalization,structural health monitoring

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【要点】：本研究开发了一种近化学计量比的铌酸锂（NSLN）压电晶体，用于高温结构健康监测的剪切横向（SH）导波传感器，其压电特性显著，特别是在高温下的性能提升是创新之处。

【方法】：研究采用了通过尺寸优化设计的纯厚度剪切振动模式d15'的NSLN基超声导波传感器。

【实验】：实验使用NSLN导波传感器沿两个正交主方向（0°和90°）在宽频率范围（100-350 kHz）内传播和接收纯基础剪切波（SH0波），并在100V驱动电压下于室温和650°C的高温条件下测试了其信号电压。结果表明，NSLN导波传感器在650°C的高温环境下仍保持了良好的缺陷定位能力和信噪比敏感性（16.1 dB）。