School of Aeronautics and Astronautics, Institute of Applied Mechanics, Zhejiang University, Hangzhou 310027, China.
Sensors (Basel). 2012 Dec 4;12(12):16641-59. doi: 10.3390/s121216641.
Due to advantages such as light weight, flexibility, and low cost, polyvinylidene fluoride (PVDF) films have been widely used in engineering applications as sensors for detecting strain, pressure, or micro-force. However, it is known that PVDF strain sensors have strain cross-sensitivity in mutually orthogonal directions. Furthermore, the size of the PVDF film sensor would also affect the dynamic strain sensing performance. In this paper, to investigate the cross-sensitivity and size effects experimentally, we employ PVDF film sensors to perform dynamic measurements on a cantilever beam. Since the vibrations of the cantilever beam are excited by impacts of a steel ball, the induced highly repeatable transient responses contain a wide range of resonant frequencies and thus can be used to investigate both the size and cross-sensitivity effects of the PVDF film sensors in a dynamic sensing environment. Based on the experimental results of the identified resonant frequencies compared with results obtained from a strain gauge, finite element calculations, and theoretical predictions, suggestions for the use of the PVDF strain sensor in modal testing are given in this paper.
由于重量轻、柔韧性好、成本低等优点，聚偏二氟乙烯（PVDF）薄膜已广泛应用于工程领域，作为应变、压力或微力传感器。然而，众所周知，PVDF 应变传感器在相互正交的方向上具有应变交叉敏感性。此外，PVDF 薄膜传感器的尺寸也会影响动态应变传感性能。在本文中，为了实验研究交叉敏感性和尺寸效应，我们使用 PVDF 薄膜传感器对悬臂梁进行动态测量。由于悬臂梁的振动是由钢球的冲击激发的，因此产生的高度可重复的瞬态响应包含广泛的共振频率，因此可用于研究 PVDF 薄膜传感器在动态传感环境中的尺寸和交叉敏感性效应。基于与应变计、有限元计算和理论预测结果相比的识别出的共振频率的实验结果，本文给出了在模态测试中使用 PVDF 应变传感器的建议。
