提出了一种基于非色散紫外(NDUV)算法, 利用光电二极管阵列(PDA)探测器和光谱仪检测一氧化氮气体的分析方法。 通过对比分析不同积分次数下一氧化氮吸收谱和无吸收谱内不同波长宽度的总光强, 引入光源影响因子F和吸收谱因子B, 得到吸光度与浓度的拟合方程及相关系数。 结果表明, 采用合适的拟合阶数、 拟合波长宽度和分析方法, 吸光度与浓度的二阶拟合相关系数可达0.999 9以上, 通过拟合方程所获得的待测气体浓度与标准值浓度的误差在3%以内。

Using photodiode array (PDA) detector and spectrometer, a method on the basis of algorithm of nondispersive ultraviolet (NDUV) is described to measure and analyze nitric oxide (NO) gas. With the introduction of light source impact factor and absorption spectrum impact factor, fitting equation and correlation coefficient between absorbance and concentration was acquired through comparative analysis on the total intensity of nitric oxide absorption and non-absorption spectrum, which are collected in different integration times and within different wavelength width. The results show that second order fitting correlation coefficient related to absorbance and concentration is above 0.999 9 and the error of concentrations between the concentration calculated by fitting equation and the standard concentration is less than 3% through using suitable fitting order, fitting wavelength width and analysis method.