近红外光谱法快速测定石英砂含水率

Water Content Measurement of Inorganic Stabilized Macadam Based on Microwave Method

为了快速精确检测石英砂试样含水率,主要采用近红外(NIR)漫反射红外光谱仪对60个红外石英砂试样进行红外扫描,采用连续微波流动检测手段测试石英砂试样含水率,并结合多个红外参数计算方法对红外消除图谱数据进行二次处理;通过选择红外消除反射常数演算法对本次采集的红外光谱数据进行二次预处理,最后利用偏最小二次相乘法对预测数据模型进行二次组合,最终成功建立了近红外预测模型,并对其数据进行外部分析验证.结果表明:单个石英砂试样含水率指标实测值与光谱预测试验模型之间的预测误差可以控制在0.5%以内,精密度RSD误差小于0.5%.该试验模型预测可以直接用来快速预测石英砂试样含水率,实现了石英砂试样含水率的快速精确检测.

In order to detect the moisture content of quartz sand quickly and accurately,this paper mainly uses near infrared(NIR)microwave diffuse reflectance infrared spectrometer to conduct infrared scanning on 60 infrared quartz sand samples,uses continuous microwave flow detection method to test the moisture content of quartz sand samples at first.and combines multiple infrared parameter calculation methods to process the infrared elimination spectrum data twice,finally By selecting the algorithm of infrared elimination reflection constant to preprocess the infrared spectrum data collected in this time,and finally using the maximum partial minimum quadratic phase multiplication to make the quadratic fitting combination of the prediction data model,the near-infrared prediction model is successfully established,and the data is verified by external analysis.The results show that the measured value of water content index of single quartz sand sample and the spectral prediction the prediction error between the experimental models can be controlled within 0.5%and the precision RSD error is less than 0.5%.The prediction of the experimental model can be directly used to quickly predict the water content of quartz sand samples,thus realizing the rapid and accurate detection of the water content of quartz sand samples.