红外技术, 2018, 40 (6): 603, 网络出版: 2018-08-04   

基于近红外TDLAS检测技术的甲烷浓度场重建研究

Research of Methane Concentration Field Reconstruction Based on Near Infrared TDLAS Detection Technology
作者单位
军事科学院防化研究院,国民核生化灾害防护国家重点实验室,北京 102205
摘要
为了实现对气体浓度场二维分布重建,基于可调谐半导体激光吸收光谱技术,以甲烷作为目标气体,选取1653.72 nm 的吸收峰位,采用直接吸收的测量手段,探测了浓度为2.97%的甲烷近红外光谱信息,通过断层重建算法对甲烷浓度场进行了模拟重建和实验研究。模拟重建采用了12×12 共144个方格的正方形重建区域,假定了一个方形区域内的具有多个空穴的浓度分布,模拟72 条光束从4个方向穿过重建区域,获取模拟光线下的投影值,经过实验统计代数重建算法均方根误差为5.58%,模拟退火算法均方根误差为8.38%;对模拟投影信号加入不同信噪比的高斯白噪声之后再进行重建,均方根误差在9.17%~15.30%之间。实验装置采用面源泄露扩散方法,通过在中心附近放置石英柱的方式人为制造浓度空穴,形成非均匀浓度场。通过对代数重建算法和模拟退火算法的重建结果对比,能够看到模拟退火算法在近红外吸收光谱层析重建方法中的应用可行性。
Abstract
In order to achieve the reconstruction of two-dimensional distribution of a gas concentration field, tunable diode laser absorption spectroscopy based on using methane as the target gas, selected 1653.72 nm absorption peaks, the measurement of direct absorption, the detection of the methane concentration of 2.97% near infrared spectral information, through the fault reconstruction of the methane concentration field simulation and reconstruction experimental study. Simulation reconstruction uses a 12×12 square reconstruction region with a total of 144 squares, assuming a square region having a plurality of hole concentration distribution, simulates 72 beams through the reconstruction area from 4 directions to obtain light projection simulation values, through the experimental statistical algebraic reconstruction algorithm, and the RMS error is 5.58%, simulated annealing algorithm of RMS is 8.38%; after the simulated projection signal with different SNR Gauss white noise and reconstruction, the RMS error is between 9.17%-15.30%. In the experimental device, a non-uniform concentration field is formed by the method of surface source leakage and diffusion, by placing a quartz column in the vicinity of the center. By comparing the reconstruction results of the algebraic reconstruction algorithm and simulated annealing algorithm, we can see the feasibility of the simulated annealing algorithm in the near infrared absorption tomography reconstruction method.

张旭, 郭腾霄, 杨柳, 丁学全, 曹树亚. 基于近红外TDLAS检测技术的甲烷浓度场重建研究[J]. 红外技术, 2018, 40(6): 603. ZHANG Xu, GUO Tengxiao, YANG Liu, DING Xuequan, CAO Shuya. Research of Methane Concentration Field Reconstruction Based on Near Infrared TDLAS Detection Technology[J]. Infrared Technology, 2018, 40(6): 603.

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