基于吸收光谱断层诊断技术的气体参数二维重建方法研究

项目名称： 基于吸收光谱断层诊断技术的气体参数二维重建方法研究

项目编号： No.61505263

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 无线电电子学、电信技术

项目作者： 宋俊玲

作者单位： 中国人民解放军战略支援部队航天工程大学

项目金额： 21万元

中文摘要： 采用吸收光谱断层诊断技术可以实现高温、高速等恶劣环境条件下燃烧流场气体温度、浓度、压强和速度等多参数的二维测量。然而，由于燃烧实验系统的复杂性和空间可用性的限制，通过安装大规模探测设备以提高二维重建结果质量变得非常困难，迫切需要建立有效的二维重建方法，分析光线分布对测量结果的影响规律，实现投影光线数目较少条件下的气体参数二维测量。本项目从重建理论方法和光线分布影响机理两个方面入手，拟根据实际流场状态建立动态燃烧流场二维分布模型，探索基于压缩感知理论的气体参数吸收光谱断层诊断新方法，揭示非均匀流场多个参数对光谱线型的影响机理，阐述光线分布对测量结果的影响规律，建立非均匀流场二维测量系统，实现对燃烧流场气体参数的实时测量。本项目提出的重建方法和实验测量手段将提高燃烧流场诊断的效率，为吸收光谱断层诊断技术在燃烧流场诊断方面的应用提供重要的理论基础和工程参考。

中文关键词： 吸收光谱断层诊断；燃烧流场诊断；压缩感知；二维重建；气体参数

英文摘要： Using absorption spectroscopy tomography technology can measure the gas parameters of combustion flow field under the severe environment of high temperature and high speed, such as gas temperature, concentration, pressure and velocity. However, due to the complexity of the combustion experimental system and the restriction of the space availability, it is very difficult to improve the two-dimensional reconstruction performance by installing large-scale detection instrumentation, it is imperative to establish effective two-dimensional reconstruction approach and analyze the effect law of ray distribution to measurement results, to realize the gas parameter two-dimensional reconstruction under a smaller number of projection rays. This project will investigate two-dimensional reconstruction of gas parameters based on absorption spectroscopy tomography from two aspects, including reconstruction theoretical methods and impact mechanism of ray distribution. We will first establish two-dimensional distribution model of dynamic combustion flow field based on real flow field states, explore new two-dimensional reconstruction approach of gas parameters based on compressed sensing theory, reveal the impact mechanism of multiple parameters of non-uniform flow fields to spectral-line form, explain the effect law of ray distribution to the measurement results, establish two-dimensional measurement system of non-uniform flow fields, and realize real-time two-dimensional measurement of gas parameters. The proposed reconstruction approach and experimental measure method will greatly improve the diagnosis efficiency of combustion flow field, which can provide important theoretical foundation and engineering reference for the application of absorption spectroscopy tomography for the combustion flow field diagnosis.

英文关键词： absorption spectroscopy tomography;combustion flow field diagnosis;compressed sensing;two-dimensional reconstruction;gas parameters