Measuring Chemical Air Emissions Using Environmental CAT Scanning

0001385 Todd这项研究的目标是开发和现场测试一种创新的实时方法，用于测量，可视化和量化化学空气排放和排放率。利用所提出的方法，利用环境CAT（计算机辅助断层扫描）扫描系统生成大面积的二维污染物浓度图，该系统将开放路径傅里叶变换红外（OP-FTIR）光谱的化学检测技术与计算机辅助断层扫描的制图能力相结合。在提出的系统中，几个OP-FTIR光谱仪沿着开放的光束路径（大约一公里）发射红外光光束，同时测量和识别大气中直接存在的多种污染物，通常是十亿分之一或百万分之一的检测水平。层析成像系统使用数学图像重建算法将多个数据处理成二维化学图。如果成功，该方法将允许在大范围内实时地进行浓度空间分辨，而与传统点采样器相比，需要更少的测量来获得相同水平的细节。* * *

0001385 Todd The goals of this research are the development and field-testing of an innovative real-time method for measuring, visualizing and quantifying chemical air emissions and emission rates. With the proposed method, two-dimensional pollutant concentration maps of large areas are generated using an environmental CAT (computer assisted tomography) scanning system that couples the chemical detection technology of open-path Fourier transform infrared (OP-FTIR) spectroscopy with the mapping capabilities of computer assisted tomography. In the proposed system, several OP-FTIR spectrometers transmit beams of infrared light along open beam paths (up to one kilometer, approximately) to simultaneously measure and identify a wide range of multiple contaminants directly in the atmosphere, typically at part per billion or part per million detection levels. The tomographic system uses a mathematical image reconstruction algorithm to process the multiple data into two-dimensional chemical maps. If successful, this method will allow concentrations to be spatially resolved in real-time over large areas with fewer measurements than would be required with conventional point samplers to obtain the same level of detail. ***