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Tailoring Thin‐Film Piezoelectrics for Crash Sensing
Small ( IF 13.0 ) Pub Date : 2018-06-25 , DOI: 10.1002/smll.201800608 Sudeep Joshi 1, 2 , M M Nayak 3 , K Rajanna 1
Small ( IF 13.0 ) Pub Date : 2018-06-25 , DOI: 10.1002/smll.201800608 Sudeep Joshi 1, 2 , M M Nayak 3 , K Rajanna 1
Affiliation
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Crash sensing and its assessment play a pivotal role in autonomous vehicles for preventing fatal casualties. Existing crash sensors are severely bottlenecked by sluggish response time, rigid mechanical components, and space constraints. Miniaturized sensors embedded with custom‐tailored nanomaterials upholds potential to overcome these limitations. In this article, piezoelectric Zinc‐Oxide thin film as a crash sensing layer is integrated onto a flexible metal‐alloy cantilever. Material characterization studies are conducted to confirm piezoelectric property of sputtered ZnO film. The piezoelectric d
31 coefficient value of ZnO film was 7.2 pm V–1. The ZnO sensing element is firmly mounted on a scaled car model and used in a crash sensing experimental set‐up. A comprehensive theoretical analysis for two different real scenarios (nearly elastic and nearly inelastic collision) of crash events followed by experimental study is discussed. The crash sensor's output exhibits a linear relationship with magnitude of impact forces experienced at crash events. The response time of ZnO crash sensor is 18.2 ms, and it exhibits a sensitivity of 28.7 mV N–1. The developed crash sensor has potential to replace bulk material sensors owing to its faster response time, high sensitivity, and compactness as the demand for crash sensors in next‐generation automobile industries is progressively growing.
中文翻译：
定制用于碰撞传感的薄膜压电器件
碰撞传感及其评估在自动驾驶汽车中发挥着关键作用，可防止致命伤亡。现有的碰撞传感器因响应时间缓慢、机械部件刚性和空间限制而受到严重瓶颈。嵌入定制纳米材料的微型传感器具有克服这些限制的潜力。在本文中，压电氧化锌薄膜作为碰撞传感层被集成到柔性金属合金悬臂上。进行材料表征研究以确认溅射 ZnO 薄膜的压电特性。 ZnO薄膜的压电d 31系数值为7.2 pm V –1 。 ZnO 传感元件牢固地安装在按比例缩小的汽车模型上，并用于碰撞传感实验装置。讨论了碰撞事件的两种不同真实场景（近弹性碰撞和近非弹性碰撞）的综合理论分析以及随后的实验研究。碰撞传感器的输出与碰撞事件中受到的冲击力的大小呈线性关系。 ZnO碰撞传感器的响应时间为18.2 ms，灵敏度为28.7 mV N –1 。随着下一代汽车行业对碰撞传感器的需求不断增长，所开发的碰撞传感器由于其更快的响应时间、高灵敏度和紧凑性而有可能取代散装材料传感器。
更新日期：2018-06-25
中文翻译：
定制用于碰撞传感的薄膜压电器件
碰撞传感及其评估在自动驾驶汽车中发挥着关键作用，可防止致命伤亡。现有的碰撞传感器因响应时间缓慢、机械部件刚性和空间限制而受到严重瓶颈。嵌入定制纳米材料的微型传感器具有克服这些限制的潜力。在本文中，压电氧化锌薄膜作为碰撞传感层被集成到柔性金属合金悬臂上。进行材料表征研究以确认溅射 ZnO 薄膜的压电特性。 ZnO薄膜的压电d 31系数值为7.2 pm V –1 。 ZnO 传感元件牢固地安装在按比例缩小的汽车模型上，并用于碰撞传感实验装置。讨论了碰撞事件的两种不同真实场景（近弹性碰撞和近非弹性碰撞）的综合理论分析以及随后的实验研究。碰撞传感器的输出与碰撞事件中受到的冲击力的大小呈线性关系。 ZnO碰撞传感器的响应时间为18.2 ms，灵敏度为28.7 mV N –1 。随着下一代汽车行业对碰撞传感器的需求不断增长，所开发的碰撞传感器由于其更快的响应时间、高灵敏度和紧凑性而有可能取代散装材料传感器。
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