基于石墨片的应变和温度传感器设计与性能研究

Design and Performance Study of Strain and Temperature Sensor Based on Graphite Sheet

优异的理化性能使石墨材料在传感器领域成为了近年的研究热点。设计了一种基于矩形悬臂梁、温控箱和湿度计的探究装置,测试了基于石墨片的应变和温度传感器的性能,其中,应变测量的线性度和灵敏度系数分别为0.978和0.00196Ω/με,温度测量的线性度和灵敏度系数分别为0.945和0.05267Ω/℃。同时,还研究了湿度对于石墨片传感器性能的影响,发现湿度对石墨片导电性影响存在突变的阈值效应。施加不同应变时,导电性突变的湿度临界值在70%左右。此研究结果表明,在利用石墨片进行电阻传感测量时,需在湿度低于70%的环境中。

Due to excellent physical and chemical properties,graphite materials have become a research hotspot in the field of sensors in recent years.A probe device based on rectangular cantilever beam,temperature control box and hygrometer are designed.The performance of strain and temperature sensor based on graphite sheet is tested.The linearity and sensitivity coefficients of strain measurement are 0.978 and 0.00196Ω/με,respectively.The linearity and sensitivity coefficients of temperature measurement are 0.945 and 0.05267Ω/℃,respectively.At the same time,the influence of humidity on the performance of graphite sheet sensor is also studied and it is found that there is a sharp threshold effect of humidity on the conductivity of graphite sheet.When different strains are applied,the critical humidity value of electrical conductivity mutation is about 70%.The results of this study show that if graphite sheets was utilized for strain measurements,it is necessary to setteled in an environment with humidity below 70%.