By using second derivative, MSC ( multiple scatter correction ) and correlation analysis the spectral characteristics of caffeine in the near infrared region can be seen very clearly, thus the robust calibration model can be set up easily. 通过对样品的漫反射原始吸光度光谱进行导数、散射校正及相关分析更清晰地给出了咖啡因在近红外光谱波段的光谱特性,为建立快速稳健的定标模型创造了条件。