International Society for Industrial Process Tomography

TDLAS and ECT Fused Tomography System for Flame Monitoring

Die Hu^*, Lijun Xu, Heng Xie, Shijie Sun, Jiangtao Sun and Zhang Cao

School of Instrument Science and Opto-Electronic Engineering, Beihang University,

37 Xueyuan Rd., Haidian Dist., Beijing, China

^*Email: hd@buaa.edu.cn

ABSTRACT

Flame monitoring is highly desired in combustion-related industries, where the temperature is one of the most important index in measurement. Multiple sources of data can provide comprehensive information for flame monitoring and are valuable for combustion study. In this paper, electrical capacitance tomography (ECT) was fused with tunable diode laser absorption spectroscopy (TDLAS) tomography to image the cross-section of the flame. A fused TDLAS and ECT sensor was designed for the first time to align the imaging plane. Optical accesses are reserved by dividing the ECT sensor to two parts. Data acquisition systems with parallel measuring modules, along with advanced reconstruction algorithms, were applied in the experiment. In the experiment, an alcohol lamp was monitored by the proposed fused tomography system at different positions. ECT had good real-time performance, obtaining about 10 frames per second, while TDLAS tomography requires a long time for absorbance curve fitting before image reconstruction. Dual-modality images by both ECT and TDLAS tomography correspond well with the experimental setup, validating the feasibility of the fused system in flame monitoring. The system has better real-time performance than TDLAS and better temperature quantitative performance than ECT. Moreover, in future studies, ECT images could fuse with TDLAS tomography images to measure the temperature of the flame, and the spatial resolution could be improved.

Keywords dual-modality, electrical capacitance tomography, flame monitoring, TDLAS tomography

Industrial Application General