Zhang Yazhou, Wu Huansheng, Liu Linpeng, Yang Yang, Zhang Changchao, Duan Ji'an
State Key Laboratory of Precision Manufacturing for Extreme Service Performance, College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China.
China Railway 14 Bureau Group Co., Ltd., Jinan 250101, China.
Polymers (Basel). 2024 Sep 7;16(17):2535. doi: 10.3390/polym16172535.
Vibration sensors are widely applied in the detection of faults and analysis of operational states in engineering machinery and equipment. However, commercial vibration sensors with a feature of high hardness hinder their usage in some practical applications where the measured objects have irregular surfaces that are difficult to install. Moreover, as the operating environments of machinery become increasingly complex, there is a growing demand for sensors capable of working in wet and humid conditions. Here, we present a flexible, superhydrophobic vibration sensor with parallel microcracks. The sensor is fabricated using a femtosecond laser direct writing ablation strategy to create the parallel cracks on a PDMS film, followed by spray-coating with a conductive ink composed of MWCNTs, CB, and PDMS. The results demonstrate that the developed flexible sensor exhibits a high-frequency response of up to 2000 Hz, a high acceleration response of up to 100 m/s, a water contact angle as high as 159.61°, and a linearity of 0.9812 between the voltage signal and acceleration. The results indicate that the sensor can be employed for underwater vibration, sound recognition, and vibration monitoring in fields such as shield cutters, holding significant potential for mechanical equipment vibration monitoring and speech-based human-machine interaction.
振动传感器在工程机械和设备的故障检测及运行状态分析中有着广泛应用。然而，具有高硬度特性的商用振动传感器在一些实际应用中受到限制，这些应用场景中被测物体表面不规则，难以安装。此外，随着机械运行环境日益复杂，对能够在潮湿环境中工作的传感器需求也日益增长。在此，我们展示了一种具有平行微裂纹的柔性超疏水振动传感器。该传感器采用飞秒激光直写烧蚀策略在聚二甲基硅氧烷（PDMS）薄膜上制造平行裂纹，随后用由多壁碳纳米管（MWCNTs）、炭黑（CB）和PDMS组成的导电油墨进行喷涂。结果表明，所开发的柔性传感器具有高达2000 Hz的高频响应、高达100 m/s的高加速度响应、高达159.61°的水接触角以及电压信号与加速度之间0.9812的线性度。结果表明，该传感器可用于水下振动、声音识别以及盾构机等领域的振动监测，在机械设备振动监测和基于语音的人机交互方面具有巨大潜力。
