Liu Bin, Sun Chang-Ku, Zhang Chi, Zhao Yu-Mei, Liu Jun-Ping
State Key Lab of Precision Measurement Technology and Instruments, Tianjin University, Tianjin 300072, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2011 Jan;31(1):197-200.
A concentration retrieving method using statistics is presented, which is applied in differential optical absorption spectroscopy (DOAS) for measuring the concentration of SO2. The method uses the standard deviation of the differential absorption to represents the gas concentration. Principle component analysis (PCA) method is used to process the differential absorption spectrum. In the method, the basis data for the concentration retrieval of SO2 is the combination of the PCA processing result, the correlation coefficient, and the standard deviation of the differential absorption. The method is applied to a continuous emission monitoring system (CEMS) with optical path length of 0.3 m. Its measuring range for SO2 concentration is 0-5 800 mg x m(-3). The nonlinear calibration and the temperature compensation for the system were executed. The full scale error of the retrieving concentration is less than 0.7% FS. And the measuring result is -4.54 mg x m(-3) when the concentration of SO2 is zero.
提出了一种利用统计数据的浓度反演方法，该方法应用于差分光学吸收光谱法（DOAS）测量SO₂浓度。该方法利用差分吸收的标准偏差来表示气体浓度。采用主成分分析（PCA）方法处理差分吸收光谱。在该方法中，用于SO₂浓度反演的基础数据是PCA处理结果、相关系数和差分吸收的标准偏差的组合。该方法应用于光程长度为0.3 m的连续排放监测系统（CEMS）。其SO₂浓度测量范围为0 - 5800 mg·m⁻³。对系统进行了非线性校准和温度补偿。反演浓度的满量程误差小于0.7%FS。当SO₂浓度为零时，测量结果为-4.54 mg·m⁻³。
