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从化学计量学角度研究了近红外光谱技术测定航空燃料冰点的原理．使用偏最小二乘法分别建立了短波近红外和长波近红外的航空燃料冰点快速测定模型．将近红外法冰点测定结果和标准方法（ＧＢ ２４３０—８１）测定结果进行了比较，两种结果吻合得很好（标准偏差为１．４７℃。），近红外光谱法具有分析精度高（标准偏差为０．５３℃），快速（单个样品分析时间为 ｌｍｉｎ）和操作方便的优点．实际分析结果表明，石油化工科学研究院研制的ＣＣＤ短波近红外光谱仪分析性能达到进口傅立叶近红外光谱仪水平。
The principle of near infrared spectroscopy for determining the freezing point of aviation fuel was studied from the standpoint of stoichiometry. The partial least square method was used to establish the rapid determination model of short-wave near-infrared and long-wave near-infrared air-fuel freezing point. The results of the near-infrared method freezing point comparison with the standard method (GB 2430-81) are in good agreement (the standard deviation is 1.47 ℃), and the NIRS method has the advantages of high precision (standard deviation 0.53 ℃), fast (single sample analysis time lmin) and easy to operate advantages. The actual analysis results show that the CCD shortwave near infrared spectrometer developed by the Institute of Petrochemical Technology has reached the level of imported Fourier transform infrared spectrometer.