Nesser Hussein, Lubineau Gilles
Mechanics of Composites for Energy and Mobility Lab, Mechanical Engineering Program, Physical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia.
Sci Rep. 2022 Aug 17;12(1):13950. doi: 10.1038/s41598-022-18265-x.
Strain mapping over a large area usually requires an array of sensors, necessitating extensive and complex wiring. Our solution is based on creating multiple sensing regions within the area of a single capacitive sensor body by considering the sensor as an analogical transmission line, reducing the connections to only two wires and simplifying the electronic interface. We demonstrate the technology by using piezoresistive electrodes in a parallel plate capacitor that create varying proportions of electromagnetic wave dissipation through the sensor length according to the interrogation frequency. We demonstrate, by a sensor divided into four virtual zones, that our cracked capacitive sensor can simultaneously record strain in each separated zone by measuring the sensor capacitance at a high frequency. Moreover, we confirm that by changing the frequency from high to low, our sensor is able to measure the local strain amplitudes. This sensor is unique in its ability to monitor strain continuously over a large area with promoted spatial resolution. This sensing technology with a reduced number of wires and a simple electronic interface will increase the reliability of sensing while reducing its cost and complexity.
大面积的应变映射通常需要一系列传感器，这就需要大量且复杂的布线。我们的解决方案是，将单个电容式传感器主体区域内创建多个传感区域，把传感器视为模拟传输线，从而将连接减少到仅两根线，并简化电子接口。我们通过在平行板电容器中使用压阻电极来演示该技术，这些电极会根据询问频率在传感器长度上产生不同比例的电磁波耗散。我们通过一个分为四个虚拟区域的传感器证明，我们的裂纹电容式传感器可以通过高频测量传感器电容来同时记录每个分离区域的应变。此外，我们证实，通过将频率从高到低变化，我们的传感器能够测量局部应变幅度。这种传感器的独特之处在于，它能够以提高的空间分辨率在大面积上连续监测应变。这种具有减少布线数量和简单电子接口的传感技术将提高传感的可靠性，同时降低其成本和复杂性。
