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利用碳纳米管拉曼特征峰位对其变形的灵敏特性,基于拉曼光谱的碳纳米管应变传感方法,已经实现了针对非拉曼活性固体材料表面微尺度范围内的平面应变分量非接触传感测量。本文侧重该方法在微尺度实验力学研究中的推广应用,从传感介质和制备工艺的选择出发,采用改进后的三种不同工艺,制备了碳纳米管/环氧树脂复合薄膜作为传感介质;综合零载标定实验和步进单轴拉伸标定实验的实测结果,对比分析了不同工艺获得传感介质的应变传感灵敏度、量程、稳定性和时间分辨率四个关键性能指标;最后对传感性能的影响因素进行了探讨。
Based on the sensitivity characteristics of the Raman peak position of carbon nanotubes to its deformation, a strain sensing method based on Raman spectroscopy of carbon nanotubes has been implemented for non-contact with the plane strain component in the micro-scale range of non-Raman active solid surface Sensing measurement. In this paper, we focus on the application of this method in the microscale experimental mechanics research. Starting from the selection of sensing media and preparation process, three modified carbon nanotubes / epoxy composite films were prepared as sensing media The four key performance indexes of strain sensing sensitivity, range, stability and time resolution obtained by different processes were compared and analyzed based on the actual zero-scale calibration experiment and the step-by-step uniaxial tension calibration experiment. Finally, Influencing factors of sensing performance are discussed.