激光法与消光沉降法测试泥沙粒径误差分析

M S2000激光粒度分析仪,是目前黄河水文行业中引进的新一代测试泥沙粒径的分析仪器。它以体积为测量基准、用等效球体来表现测量成果,传统的消光沉降法是以重量为测量基准、使用沉降原理来测量泥沙颗粒的大小。由于两种方法分析原理的不同,导致分析成果产生较大差异。通过用激光法与传统消光沉降法对不同沙型的泥沙样品分别对比测试,建立了本测区两种分析成果之间的相关关系,以解决新旧泥沙颗粒级配资料的衔接问题。

Errors analysis of testing sediment grain size by the methods of laser way and extinction sedimentation way

Mastersizer 2000 was a new analyzer that has been imported in hydrometric trade of Yellow River to test sediment grain size.Its measuring basic standard is volume,and use equivalent ball to show the measuring result.Measuring basic standard of traditional extinction sedimentation way is weight,and use sedimentation principle to measure sediment grain size.The different between two methods may lead to different outcome.We used laser way and extinction sedimentation way to compare and test sediment grain sample of the different sand type,and established the relationship of two outcome in the measuring area to solve the connect problem between new distribution data of sediment grain and the old one.