遥感傅里叶变换红外光谱测定气体污染物在单光程上的浓度分布

采用开路傅里叶变换红外光谱(OP—FTIR)，对室内固定点源排放的污染物丙酮进行了实时遥感监测。给出了丙酮在同一条光路上，不同光程长的积分浓度和采用多项式拟合出的积分浓度，并且利用一种一维计算机层析算法(CT)模型，分别用高斯模型和多项式模型，重构出了丙酮在所测光路上的浓度分布曲线。两种方法重构出丙酮在所测光路上，浓度的最大值分别为0．0190mg／L和0．0213mg／L，最大值分别位于坐标3．11m和3．09m处。研究结果表明：两种方法对浓度的分布能够得到较为一致的结果。可见，OP-FTIR与一维CT模型联用，可以给出污染物的单光程浓度分布，该技术应用于工业或环境卫生监测，具有预警作用。

Path Concentration Distribution of Air Contaminants Measured by Remote Sensing Fourier Transform Infrared Spectroscopy

An open-path (OP) remote sensing Fourier tansform infrared spectroseopy (FTIR) was utilized for the real time monitoring of acetone leaking from a fixed spot indoors. The path integrated concentration (PIC) of acetone along the beam path was measured and fitted by polynomial regression method. To map the concentration distribution of acetone along the beam path, the one-dimensional computed tomography (CT) reconstruction technique was introduced which was Gaussian model and polynomial regression model, respectively. The maximum concentration of acetone along the beam path was 0.0190 mg/L at 3.11 m away from instrument and 0.0213 mg/L at 3.09 m away from the instrument by the two models, respectively. Results showed that the two models could give the accordant mapping of the acetone concentration distribution. It can be concluded that OP-FTIR coupled with one-dimensional CT reconstruction can provide the concentration distribution of air contaminant along one single beam path and monitor in environmental and industrial ~hygiene working as an ~alarm system.