沥青混合料含水量集成检测系统设计与研究

摘要

为提高路面沥青混合料含水量测量装置精度,简化结构,提出一种1.5 GHz微带环结构的含水量传感器检测系统.因含水量不同,不饱和混合料介电常数变化,导致微带环有效介电常数发生改变,谐振频率偏移.通过谐振频率反演混合料介电常数,建立含水量与有效介电常数的线性关系求得沥青混合料含水量.研究工作包括算法分析、微带环结构设计仿真、系统软硬件集成设计.混合料样本(含水量0 ～ 30％)测试显示测量分辨率≤0.1％,误差≤1％,系统响应时间≤100 ns.这种新型传感器体积小、功耗低、精度高,适合路面测量.%To improve the accuracy of the sensor measuring pavement asphalt mixture moisture,and simplify its structure,A 1.5 GHz micro-ring resonator is presented in the paper.With different water content,the dielectric constant of unsaturated asphalt mixture changes within a range,which causes effective dielectric constant of microring changed and micro-ring resonant frequency shifted.To invert the mixture dielectric through the resonant frequency,and build the linear-proportion between water content and effective dielectric constant,water content in asphalt mixture can be got.The research work includes algorithm analysis,micro-ring structure design and simulation,and sensor integration design.Mixture sample (water content in 0 ～ 30％) tests show that the measurement resolution≤0.1％,the measurement error≤ 1％,the system response time ≤ 100 ns.This new sensor is small volume,low power consumption,high precision,suitable for pavement detection.