基于电荷耦合元件线阵的接触线磨损测量技术与应用

接触线磨损量的测量是改善弓网关系、确保列车正常运行的关键。针对相关技术的现状及发展,对基于DSP(数字信号处理器)和CCD(电荷耦合元件)线阵的非接触测量技术进行了研究。主要设计了利用一片DSP芯片完成对CCD的驱动和数据采集,阐述了芯片时序的产生和配合问题。然后通过图像处理技术对采集到的接触线磨损图像进行处理,从而计算出接触线的磨损量。根据工程测量的实际需要,设计了一套基于线阵CCD和DSP的接触线磨损量监测装置。提出采用线阵CCD和DSP及平行光构成的测量系统,测量精度高、响应时间短,适用于恶劣的工况环境。

Resistivity measurement of conductive asphalt concrete based on two-electrode method

The objective of this work is to develop a novel methodology for determining real resistivity of conductive asphalt concrete based on two-electrode method.Due to an influence of contact resistance,the measured resistivity is always not equal to the real resistivity.To determine the real resistivity,a linear relationship of the measured resistivity,contact resistance and the real resistivity was established.Then experiments for six specimens with varying graphite contents were designed and performed to validate the formulation.Results of experiments demonstrate that the slope of the line represents contact resistance,and the intercept indicates the real resistivity.The effects of graphite content on contact resistance and real resistivity are also revealed.Finally,results show that the influence of contact resistance on accuracy of resisitvity measurement becomes more serious if graphite content is beyond 3%.Hence,it is the time to choose this novel methodology to determine the real resistivity of asphalt concrete by taking account of contact resistance.

CCD技术测算提升钢丝绳直径的研究

简述了目前国内摩擦提升钢丝绳直径检测的主要方法,并针对现状结合CCD技术,提出了一种新的提升钢丝绳直径CCD实时在线非接触式线径测量方法。