痕量气体探测的散射增强吸收光谱技术研究

项目名称： 痕量气体探测的散射增强吸收光谱技术研究

项目编号： No.61308065

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 无线电电子学、电信技术

项目作者： 张云刚

作者单位： 燕山大学

项目金额： 24万元

中文摘要： 基于高反射腔内的散射介质对痕量气体吸收光谱影响的研究，一种新的以散射介质为媒介并以高反射腔代替传统气体池的痕量气体探测散射增强吸收光谱（SEAS）技术被提出。本项目将通过研究不同反射率和粒径的散射介质与气体吸收光谱之间的关系，以及散射介质与高反射腔结合对气体吸收光谱规律的影响，建立散射介质和高反射腔参量与气体吸收光谱之间关系的理论描述，并通过时间分辨光谱验证理论关系；开展基于SEAS技术的痕量氧气测量研究，通过与直接氧气测量结果比较，实现对SEAS技术指标定量评价；探索气体浓度对SEAS技术的影响规律，建立包含关键影响因素的理论公式，为该技术的应用奠定充分的理论基础。该技术的开发目标是实现对工业无氧焊接中痕量氧气和其他工业设备中痕量气体的监测，该技术的发展对当前痕量气体环境的评估具有重要意义。

中文关键词： 可调谐二极管激光吸收光谱技术；漫反射立方腔；气体检测；等效光程；散射增强吸收光谱技术

英文摘要： A novel Scatter Enhanced Absorption Spectroscopy (SEAS) technique for trace gas monitoring was developed using scattering material and high reflection cavity in place of traditional gas cell. This technique is based on the study of influence rules of scattering material in high reflection gas cavity to the absorption spectrum of the target trace gas. In this project, the theoretical relations of the scattering material and high reflection cavity parameters to gas absorption spectrum will be established by sdutying the influence rules of gas absorption spectrum on sacttering materials with different reflectivity and size and that on the combination of high reflection cavities with the scattering material. The theoretical results will be tested by time resolved spectrocopy. A novel trace oxygen monitoring technique will be studied based on the SEAS technique. The quantitative evaluation of this SEAS technique will be estimated by the comparing with traditional direct absorption technique for oxygen detection. By analyzing the affect rules of various concentrations and absorption wavelenths of the sample gas to SEAS technique, a theoretical fomula will be established which will be the theoretical foundation for further application. This novel technique is aimed at continuous monitoring of trace oxygen in anaerobic

英文关键词： Tuneable Diode Laser Absorption Spectroscopy；High Diffuse Cubic Cavity；Gas Sensing；Effective Optical Path Length；Scatter Enhanced Absorption Spectroscopy