最小二乘法原理是测定值计算的基础,其原理首由高斯阐明。照相法一般是由已知含量标样先由人工画出工作曲线,分析样品则由此工作曲线直接查得含量,不必建立曲线的分析表达式。现在光电光谱仪多数都配有电子计算机来代替人工查曲线的工作。这就需要把工作曲线表示成数学形式,计算机就根据此公式进行计算。光电 The principle of least square method is the basis for the determination of the value of the calculation, the principle of the first Gaussian elucidation. Photographic method is generally known from the content of the standard sample first draw the working curve, the analysis of samples from the working curve directly check the content, do not have to establish the analytical expression curve. Now most of the optical spectrometers are equipped with electronic computer instead of manually checking the curve of the work. This requires that the working curve be represented in mathematical form, and the computer will calculate it according to this formula. photoelectric