共查询到18条相似文献,搜索用时 176 毫秒
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针对目前聚偏二氟乙烯(PVDF)压电薄膜在船舶与海洋工程结构表面应变传感应用方面存在的一些缺陷,提出了一种将压电薄膜保护在结构的油漆涂层下面,并采用非接触式静电电压表检测薄膜表面感应电荷的结构表面应变测量方法。首先,根据压电方程推导了在非接触测量方式下,电压表测量电压和结构表面应变分量间的关系式;然后,从静电电压表探头的测量原理分析了探头和被测表面间的零电场技术,从理论上预测可以对埋藏在油漆涂层下的PVDF压电薄膜进行感应电荷检测;最后在一块平滑钢板试件上粘贴10片压电薄膜,并进行表面油漆喷涂处理,通过试件单向加载实验,对电压-应变关系式中的参数进行标定和测量油漆涂层下的薄膜表面感应电荷。实验结果表明,该法在应用上具有可行性和明显的工程意义。 相似文献
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基于PVDF的表面计测传感特性分析与应用 总被引:2,自引:1,他引:1
探讨了聚偏氯乙烯(PVDF)压电薄膜的传感特性,建立了一套包括电荷放大器、数据采集器的计算机信号处理系统,为PVDF传感器用于应变测试提供了理论基础。该文根据PVDF压电薄膜压电特性设计的表面计测传感器,具有压电系数高,柔韧性好,质量轻,易粘贴和价格低廉等优点。将该传感器用于粗糙度测试,实验表明该表面计测传感器能敏感地识别纸张粗糙度的变化。 相似文献
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近年来,压电薄膜振动传感器发展十分迅速,已被广泛应用于结构健康监测、医疗电子、加速度、器件振动等测量。该文针对压电薄膜振动传感器的性能检测,设计了一套以可调频激振台作为核心的压电传感器灵敏度与频响特性标定装置。振动信号由可调频激振台提供,标准压电传感器与自制传感器同步进行振动测试。测试结果表明,该装置可方便地实现对被测传感器灵敏度和频率响应特性的标定。标定系统整体设计简单,操作方便。同时系统体积小,稳定性高,测量误差小,便于对各种类型的压电振动传感器进行检测,具有很强的实用性和广阔的发展空间。基于该系统对自制压电薄膜传感器性能的标定,研究了压电薄膜传感器灵敏度的影响因素。 相似文献
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氧化锌压电薄膜传感器设计理论研究 总被引:1,自引:0,他引:1
利用压电薄膜和表面微机械技术可实现新型的氧化锌簿膜器件。本文分析了氧化锌薄膜表面微机械器件中氧化锌的压电效应,微机械结构的应力分布,以及压电感应电荷与器件尺寸的关系。这些结果可为器件的设计提供理论依据。 相似文献
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Originated from aerospace area, smart material structures have been a research hotspot in the application of engineering. For structural health monitoring within the context of civil engineering, the research about high-performance sensing units are very important. As one of the piezoelectric materials belonging to smart ones, Polyvinylidene Fluoride (PVDF) is widely regarded for its property advantages of low cost, good mechanical abilities, high sensibility, and corrosion resistance. In this paper, for the validation of PVDF sensors as sensing units for bridge structural local monitoring, wireless experimental systems of PVDF sensor for structural local monitoring on a bridge model and beam were built. Firstly, based on the operating mechanism, the measurement circuit and the characteristics of PVDF are introduced. Secondly, system framework of PVDF sensor for local monitoring is proposed, a bridge model is built, wireless sensor kits are then developed. Finally, Bridge damage monitoring experiments have been done for structural local health monitoring using PVDF sensors. The experimental results show that PVDF sensor can handle structural impact response monitoring and damage detection of civil engineering, and the developed wireless sensor experimental system can be easily implemented for use in practical monitoring engineering. 相似文献
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为了提高触觉传感器的灵敏度,依据聚偏氟乙烯(PVDF)压电薄膜压电效应的基本原理,结合人体皮肤生理结构层仿生学,设计双凸点拱形结构传感器,优化集成信号调理电路,设计上位机LabVIEW数据分析处理程序,提出一种基于PVDF压电薄膜的仿生触觉检测系统。针对不同结构传感器测试分析,使用Origin软件对采集数据进行处理,验证了双凸点拱形结构传感器滑觉信号检测灵敏度最佳,是无凸点拱形传感器的1.36倍、上凸点拱形传感器的1.19倍。实验表明,该系统可检测判断触滑热觉信号,实现触觉传感器的仿生皮肤功能。 相似文献
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Yang Ju 《Journal of Infrared, Millimeter and Terahertz Waves》2001,22(12):1853-1861
As the basis of the evaluation of nature cracks, a millimeter wave method to evaluate the shape of a thin 3D slit on the metal surface is demonstrated. An open-ended coaxial line sensor was proposed to improve the spatial resolution of the measurement. The amplitude of the reflection coefficient that is associated with the dimensions of the slit is measured by scanning the specimen in the direction perpendicular to the detected slit. A characteristic signal corresponding to the detected slit was obtained and, was used to evaluate the depth of the slit. 相似文献
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PVDF传感器在液体压力激波测试中的应用 总被引:1,自引:0,他引:1
针对液体压力激波具有高温、高压和高应变的特点,研制了一种基于聚偏氟乙烯(PVDF)压电薄膜的液体压力激波传感器,并通过霍普金斯(Hopkinson)压杆对压电传感器的压电系数进行了精确标定,在此基础上构建了液体压力激波测试系统.在小压力幅值下,与水听器进行了对比测试试验,测试结果具有很高的吻合性,在满量程(0.1~1.0 MPa)内,与水听器偏差在5%范围内;大压力幅值下,通过对单元和多阵元液体压力激波发生器系统的测试,掌握了激励电压、脉冲频率、阵元个数等对激波的影响规律,为液体压力激波加工系统的改进和工程应用提供了试验依据. 相似文献
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《Mechatronics》2007,17(8):462-467
This paper reports on the design and modeling of an endoscopic tooth-like tactile sensor which is capable of measuring compliance of a contact tissue/sensed object. Present day endoscopic graspers are designed to be tooth-like in order to grasp slippery tissues. They are not, however, able to measure tissue tactile properties such as force and softness. In this work, proof of a conceptual and innovative design of an endoscopic piezoelectric tactile sensor is presented. The main objective of this study is to design and model a piezoelectric sensor capable of measuring the total applied force on the sensed object, as well as the compliance of the tissue/sensed object. Detecting the sensed objects compliance is based on the relative deformation of contact object/tissue on the rigid and compliant elements. One polyvinylidene fluoride (PVDF) film is placed between the rigid cylinder and the plate and is responsible for the measurement of the force applied on the rigid element. Another PVDF film is sandwiched between the two base plates to measure the total force applied on the sensor. The compliance of the sensed object is measured by recording the PVDF films response under different load sets. The data obtained for the force variation are plotted against the modulus of elasticity of the sensed object. We used finite element modeling results as a basis of comparison for the experimental data. The agreement between the theoretical predictions and the experimental data is reasonable and within the acceptable range. 相似文献