Research On Improvement And Application Of Carbon Nanotube Strain Sensor

The rapid development of micro/nano science and technology puts forward higherrequirement on experimental mechanics. Carbon nanotubes with its superior force-spectrum properties can be excellent microscale strain sensing medium or sensors.Previous work has been put forward of the carbon nanotubes in-plane strain sensingtheory model based on the Raman spectrum and its application technology, whichimplemented for the non-contact sensing and measurement of microscale plane straincomponent towards any non Raman active solid materials surface. However,follow-up work still needs to be carried out. Such as the optimization of polarizationcontrol system, evaluation method and the calibration method of sensing performance,standardization and diversification of sensing medium preparation and so on.This paper focused on the application of carbon nanotube strain sensor and microRaman spectroscopy on experimental mechanics measurement, carried out a series ofoptimization work. First, in this paper, the polarization control method of the Ramanspectroscopy system has been improved, the dual partial collaborative control methodhas been successfully realized and the specialized polarization control device has beendesigned. Secondly, this paper analyzed the performance parameters of the carbonnanotube strain sensor and itemized proposed the improved, optimized, raised in thefeasible technical route. On this basis, this paper optimized and improved the sensingmedium materials and preparation technology, set up three standard preparationmethods of sensing medium film. Then, this paper carried out a series of calibrationexperiments, obtained the key indicators of the three sensor sensing performance, andfurther analysed and discussed the mechanics mechanism which leads to differentsensing performance, established the preparation process with different sensingcharacteristics and advantages. Finally, the optimized carbon nanotube sensor wasapplied to the strain field measurement at the tip of the mode I crack and theexperimental strain field is consistent with the theoretical solution on the trend.