激光法粒度筛析校正研究

激光法和筛析法分析作为两种最常见的用于沉积地质粒度分析的方法，其间的数据转换校正是在数据对比、数据对接时经常遇到且无法回避的问题。为此设计了两个实验，实验一对比了窄粒度范围样品两种分析方法的分析结果，统计分析了筛析法比激光法偏大的幅度，并提出一个校正方法；实验二对不同磨圆程度的样品进行分析，研究了磨圆度与两种分析方法差异程度之间的相关关系，认为实验一提出的校正方法适合一般条件下的天然沉积物粒度分析校正。文章又以实例展示了所提出的校正方法的校正效果并讨论了激光粒度法存在的问题。激光粒度分析法用于天然沉积物粒度分析时，结果常见明显的光滑化、正态化、双峰合并现象，扭曲了真实的粒度分布。文章认为实际样品具体情况远远复杂于米氏理论的设定条件，样品条件参数并未全部带入计算过程，所以激光法粒度求解是不精确的。更好的数据校正方法有待于激光粒度仪的软件、硬件改进。激光法合理的用于天然沉积物粒度分析还有一些问题需要讨论。

Rectification Study of Particle Analysing Result Between Laser Instrument and Sieving Method

Laser method analysis and sieving method analysis,as two of the most common methods used in granularity analysis of sedimentary geology,data conversion and rectification among them is a constantly encountered and inevitable question when doing data comparison and connection.This paper designed two experiments for this.The first experiment contrasted analysis results of the two analysis method of narrow granularity range samples,made statistics on the larger amplitude of sieving to laser method,and puts forward a correction method.The second experiment analysed samples of different psephicity,studied correlativity of psephicity and the diffenrence degree between the two analysis methods,regard the rectify method proposed by the first experiment is suitable for granularity analysis and rectify of natural sediments in general conditions.The article illustrated the rectify result of the proposed calibration method and discussed the problems exsiting in the method of laser granularity.When the laser granularity method used in natural sediment granularity analysis,resultly obvious graduation,normalize,petronas merger phenomenon,distorted real granularity distribution are commonnly seen.The paper argued that the specific conditions of actual samples are far more complex than the set conditions of Mie theory,sample parameters with condition not brining into the calculation process,so granularity solution of laser method is not accurate.Better data rectification method need the software and hardware improvements of laser particle analyzer.There are still some questions need to be discussed of the laser method used in granularity analysis of natural sediments.