一个单激光TDLAS传感器与双气体调制和基于BiLSTM的光谱解用于CH4/C2H6检测
Ru Jia Wang1, Haifeng Qiu1, Bairan Song1
1National Key Laboratory of Semiconductor Laser, Changchun University of Science and Technology, Changchun 130022, P. R. China.
Analytical chemistry
|March 4, 2026
概括
这项研究引入了一种新的可调节二极管激光吸收光谱 (TDLAS) 系统,使用双气调制策略和双向长短期记忆 (BiLSTM) 网络,同时准确检测甲 (CH4) 和乙 (C2H6),克服光谱干扰.
科学领域:
- 分析化学 分析化学
- 频谱学是一种光谱学.
- 环境科学 环境科学
背景情况:
- 可调节二极管激光吸收光谱 (TDLAS) 为微量气体检测提供了高灵敏度.
- 使用TDLAS进行多种类型的分析面临诸如光谱交叉干扰和波失衡等挑战,特别是对于 (CH4) 和乙 (C2H6) 等共存的气体.
- 在1680nm附近的CH4和C2H6的重叠吸收特征使同时检测变得复杂.
研究的目的:
- 开发一个单激光TDLAS系统,用于准确同时检测CH4和C2H6.
- 解决双气体传感中的光谱交叉干扰和波失衡问题.
- 为了提高对共存气体的度估计的精度和可靠性.
主要方法:
- 整合双气调制策略与基于双向长短期记忆 (BiLSTM) 的光谱解方法.
- 协调响应的动态交替,以匹配CH4和C2H6.6的半最大 (FWHM) 的全宽度.
- 应用BiLSTM模型来弥补光谱重叠并提高度估计的准确性.
主要成果:
- 拟议的TDLAS-BiLSTM系统有效地消除了波不匹配,并补偿了光谱交叉干扰.
- 稳定性测试显示了较低的标准偏差:CH4为3.66ppm,C2H6为0.56ppm.
- 在预测和参考两种气体度之间实现了高相关系数 (R2 > 0.99).
结论:
- 结合的TDLAS-BiLSTM系统显著提高了双气体传感的测量精度和可靠性.
- 这种方法为在光谱交叉敏感性存在时准确的度检索提供了实用和强大的解决方案.
- 该研究提出了多元组件气体分析的有效策略,特别是用于CH4和C2H6检测.
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