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中子测水技术在农田土壤水分监测、水文地质和土壤水分运动研究中逐步得到应用,而中子水分仪的标定则直接影响到测量结果的精度,所以在使用中子水分仪时首先必须进行严格的标定。目前国内使用的中子水分仪,有国产的和从英、美等国进口的,其性能和结构稍育差异,但标定原理相同。本文就美国坎贝尔太平洋核子仪器公司生产的503DR 型中子水分仪的标定进行讨论。中子水分仪的标定,是指事先测出土壤含水量与中子仪计数比之间的关系,并将其概化成直线方程(标定方程)。在使用过程中,测得计数比后即可借助于标定方程得出所测土壤的含水量。503DR 中子仪是一种带电脑的中子仪,只须将标定曲线的斜率和截距存储于仪器之中(1986年的新版本可存16系标定曲线),测量土壤水分时,仪器即可直接显示出上壤含
Neutron water measurement technology is gradually applied in the field of soil moisture monitoring, hydrogeology and soil moisture movement research, and the calibration of neutron moisture meter has a direct impact on the accuracy of measurement results, so when using the neutron moisture meter must first be carried out Strict calibration. Currently used neutron moisture meter, made in China and imported from Britain, the United States and other countries, its performance and structure of a slight difference between the education, but the same principle of calibration. This article discusses the calibration of 503DR neutron moisture meter manufactured by Pacific Nuclear Instruments Corporation of Campbell. The calibration of the neutron moisture meter means that the relationship between the soil water content and the neutron meter count ratio is measured in advance and generalized to a straight line equation (calibration equation). In use, the measured ratio can be obtained by means of calibration equations to determine the measured soil moisture content. The 503DR neutron meter is a neutron meter with a computer. It only needs to store the slope and intercept of the calibration curve in the instrument (the new version of 1986 can store 16-series calibration curve). When measuring soil moisture, the instrument Can be directly displayed on the soil