一种大规模粮堆介电常数测量方法  

A method for detection of dielectric constant in huge grain pile

作　　者：廉飞宇[1,2] 李青[1] 白浩[2] 

机构地区：[1]上海大学计算机工程与科学学院,上海200072 [2]河南工业大学信息科学与工程学院,河南郑州450001

出　　处：《兰州理工大学学报》2010年第6期89-93,共5页Journal of Lanzhou University of Technology

基　　金：国家"十一五"科技支撑计划子课题(2006BAD08B01);国家自然科学基金(60940017)

摘　　要：针对大规模粮堆的水分检测问题,提出利用表层穿透雷达技术,通过大范围测定粮堆内部介电常数空间分布,再利用介电-水分模型间接推算水分含量的方法.提出基于反射和折射定律,通过逐层反演的方法推算粮堆各层介电常数的方法,通过利用测井法获取的精确测量结果,反推出逐层反演法所需的校准系数,从而极大地提高逐层反演法的精度.实验结果表明,修正系数后的逐层反演法所推算的介电常数与测井法相比误差很小,能够满足实际应用要求,从而为粮堆大规模水分含量测量奠定了基础.Aimed at the problem of detection of moisture content in a large-scale grain pile,a method for moisture capacity detection was presented,in which a surface-layer penetration radar technique was to be employed,the spatial distribution of dielectric constant within grain pile was to be measured everywhere,and the moisture capacity could be detected indirectly from a permittivity-moisture model.A method for deriving the dielectric constants between the layers in the grain pile was presented on the basis of reflective and refractive laws by means of layer-by-layer inversion algorithm.The well-logging method was used to get the precise detection result and,then,the calibration coefficient necessary to above-mentioned inversion,so that the accuracy of layer-by-layer inversion algorithm was greatly improved.The experimental result showed that,compared with the well-logging method,the error of dielectric constant derived with layer-by-layer inversion algorithm with corrected coefficient was very smaller,meeting the requirement of practical application and providing a basis for large-scale detection of moisture capacity in grain pile.

关 键 词：探地雷达 介电常数 逐层反演算法 测井 

分 类 号：TN957.51[电子电信—信号与信息处理] P631[电子电信—信息与通信工程]