Blades play a critical role in the wind turbine system. Therefore, their structural health monitoring is very important. Blades are damaged by sudden changes in wind load, cracks due to collision of foreign objects, and disasters, such as lightning strikes, hail, and typhoons. Moreover, blades are expensive to maintain. Defects or damages to wind turbine blades reduce the life span and power generation efficiency of the wind turbine and increase safety risks and maintenance costs. Therefore, it is very important to detect blade damage to prevent problems in the wind turbine. Ultrasonic inspection is suitable for blades made of composite materials. Piezoelectric ceramic, which is a typical piezoelectric element, has relatively high sensitivity compared to other sensors. However, it suffers from brittle fractures and thus difficult to apply to curved structures. To overcome the limitations of piezoelectric ceramics, a piezoelectric flexible line sensor that can be applied to curved surfaces was manufactured using the dice-and-fill method for a [Pb(Li_0.25Nb_0.75)]_0.06 [Pb(Mg_0.33Nb_0.67)]_0.06 [Pb(Zr_0.50Ti_0.50)]_0.88O₃ with 0.7 wt% MnO₂ (PZTNMML) ceramic disc. Instead of a typical ultrasonic inspection method with limited surface contact, a laser capable of producing ultrasonic excitation of ultrasonic waves over a large area from a long distance was used. The possibility of detecting a defect on the wind turbine blade using a piezoelectric flexible line sensor and laser ultrasound was confirmed in this study.

叶片在风力涡轮机系统中起着至关重要的作用。因此，它们的结构健康监测非常重要。风荷载的突然变化、异物碰撞引起的裂纹以及雷击、冰雹和台风等灾害都会损坏叶片。此外，刀片的维护成本很高。风力涡轮机叶片的缺陷或损坏会降低风力涡轮机的寿命和发电效率，并增加安全风险和维护成本。因此，检测叶片损坏以防止风力涡轮机出现问题非常重要。超声波检测适用于复合材料制成的叶片。压电陶瓷是一种典型的压电元件，与其他传感器相比具有相对较高的灵敏度。然而，它具有脆性断裂，因此难以应用于弯曲结构。为了克服压电陶瓷的局限性，使用骰子和填充方法制造了一种可应用于曲面的压电柔性线传感器，用于 [Pb(Li_0.25 Nb _0.75 )] _0.06 [Pb(Mg _0.33 Nb _0.67 )] _0.06 [Pb(Zr _0.50 Ti _0.50 )] _0.88 O ₃与 0.7 wt% MnO ₂ (PZTNMML) 陶瓷盘。代替了具有有限表面接触的典型超声波检测方法，使用了能够从远距离在大面积上产生超声波的超声波激发的激光器。本研究证实了使用压电柔性线传感器和激光超声检测风力涡轮机叶片缺陷的可能性。