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碳纳米管作为一种拉曼力学传感介质具有优异的力学性质及共振、偏振拉曼特性。将碳纳米管散布在基体材料中,即可实现局部应力/应变的测量。受到光学衍射极限的限制,常规的远场拉曼光谱得到的是一定区域内众多碳管的平均散射信息。本文综合考虑了采样点内各方向碳管的影响,并对碳管散射的共振状态、碳管的分布状态、拉曼系统的偏振构型及偏振方向等实验因素对碳纳米管应变传感器性能的影响进行了深入分析,采用分峰和重构的方法定量地给出了不同实验模式下采样点内的拉曼信息组成以及各种实验模式的测量精度。分析和对比表明,采用双偏振构型且偏振方向沿荷载施加方向时的测量精度最高,即最优的实验模式。
As a Raman mechanical sensing medium, carbon nanotubes have excellent mechanical properties and resonance and polarization Raman properties. The carbon nanotubes dispersed in the matrix material, you can achieve local stress / strain measurements. Limited by the optical diffraction limit, conventional far-field Raman spectroscopy gives the average scattering information of numerous carbon nanotubes in a given area. In this paper, we consider the influence of carbon nanotubes in all directions in the sampling points, and analyze the influence of carbon nanotubes on the performance of carbon nanotube strain sensors such as the resonance state of carbon nanotubes, the distribution of carbon nanotubes, the polarization configuration of Raman system, The influence of the Raman signal is analyzed in detail, and the composition of Raman information and the measurement accuracy of various experimental modes are quantitatively given by the method of sub-peak and reconstruction. Analyzes and comparisons show that the measurement accuracy is the highest when the polarization direction is applied along the direction of load, that is, the optimal experimental mode.