光透射-光反射方法获取光程放大校正因子的关键技术研究

A study on a path-length amplification correction factor by a transmittance-reflectance method

光透射-光反射测量方法（T-R方法）是测量悬浮颗粒物吸收系数的主要方法之一,其中GF/F滤纸水合程度以及光程放大校正因子模型是其关键问题。GF/F滤纸水合程度对光学性质的影响实验分析结果表明,浸泡60-80 min的滤纸,其透射比、反射比和反射率误差最小,其值分别为3.0%,0.5%和0.5%。在此基础上,以小球藻为研究对象,对T-R方法的光程放大校正因子模型进行了研究,结果表明多项式回归模型优于线性和乘幂回归模型;选择二次多项式模型作为T-R方法的光程放大校正因子模型,其回归区间为[0.05,0.4],平均相对误差为9.19%。

A transmittance-reflectance（T-R）method is one of the most important methods to measure the absorption coefficient of suspended particulate matter.The GF/F filter paper＇s hydration degree and the path-length amplification correction factor model play the key roles in the T-R method.The effect of the hydration degree of the GF/F filter paper on the optical properties was experimentally analyzed.The results show that the error of transmittance ratio,reflectances ratio and reflectance of the filter paper which is soaked 60~80 min,is the minimum,and their values are 3.0%,0.5% and 0.5%.On this basis chlorella were used as a research object,the path-length amplification correction factor model of the T-R method was studied.The results show that a polynomial regression model is superior to a linear regression model and a power regression model;and a quadratic polynomial model is selected as the path-length amplification correction factor model of the T-R method.The regression interval is [0.05,0.4],and the average relative error is 9.19%.