It is shown that the wavelength modulated reflective spectrum is essentially the first derivative of dielectric function with respect to the energy.

分析表明波长调制反射谱的实质，是介电函数对能量的一级微商。

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The original spectrum is processed by using first derivative, and applying Partial Least-Squares method to set up linear mathematical model.

采用一阶导数方法对光谱进行预处理；利用偏最小二乘法建立模型。

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The original spectrum is processed by using first derivative, and applying Partial Least-Squares method to set up linear mathematical model.

采用一阶导数方法对光谱进行预处理；利用偏最小二乘法建立模型。

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