Analysis of algebraic reconstruction technique for accurate imaging of gas temperature and concentration based on tunable diode laser absorption spectroscopy

分类： 物理学 >> 普通物理:统计和量子力学,量子信息等 提交时间： 2017-11-02

夏晖晖

摘要： An improved algebraic reconstruction technique(ART) with tunable diode laser absorption spectroscopy(TDLAS) is presented in this paper for determining two-dimensional distribution of H2O concentration and temperature in a simulated combustion flame. This work aims to simulate the reconstruction of spectroscopic measurements by a multi-view parallel-beam scanning geometry and analyze the effects of projection rays on reconstruction accuracy. It finally proved that reconstruction quality dramatically increases with increasing number of projection rays until they are more than 180 for 20×20 grid, and after that point, the number of projection rays has little impact on reconstruction accuracy. It is clear that the temperature reconstruction results are more accurate than the water vapor concentration by traditional concentration calculation method, the study in this article also proposed an innovative way to reduce the error of concentration reconstruction and improve the reconstruction quality greatly, the capability of this new method is evaluated by appropriate assessment parameters. By using this new approach, the concentration reconstruction accuracy is not only badly improved, but also a suitable parallel-beam arrangement is put forward for sake of high reconstruction accuracy and simplicity of experimental validation. At last, a bimodal structure of combustion region is assumed to demonstrate the robustness and universality of the proposed method. Numerical investigation indicates that the proposed TDLAS tomographic algorithm is capable for accurate temperature and concentration profiles detection, this feasible formula for reconstruction research is expected to resolve several key issues in practical combustion devices.

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