Surface Crack Monitoring by Rayleigh Waves with a Piezoelectric-Polymer-Film Ultrasonic Transducer Array. - Xiaotian Li; Voon-Kean Wong; Yasmin Mohamed Yousry; David Boon Kiang Lim; Percis Teena Christopher Subhodayam; Kui Yao; Liuyang Feng; Xudong Qian; Zheng Fan (Sensors, 2023)