High-stability gas detection based on modulated laser spectral absorption
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摘要: 为了精确测定待测气体的体积分数，提高可调谐二极管激光吸收光谱(TDLAS)的稳定性，优化了TDLAS气体检测系统的扫描信号。基于HITRAN数据库，选定了甲烷气体在1654 nm附近吸收峰，计算出含甲烷、水蒸气和二氧化碳混合气体的吸收系数；使用可视化仿真工具对气体检测系统进行理论仿真，同时通过搭建的气体检测系统验证仿真结果。结果表明，通过优化扫描信号，提高了检测系统的稳定性，偏差值从0.3%降至0.07%；建立了2次谐波信号均值与气体体积分数的反演模型，线性拟合的相关系数R2=99.99%。此研究为提升TDLAS系统的稳定性和准确性，及实现高稳定气体检测具有一定的参考价值。
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关键词:
- 光谱学 /
- 波长调制光谱-可调谐二极管激光吸收光谱 /
- 呼出气检测 /
- 建模仿真
Abstract: In order to accurately determine the volume fraction of the gas to be measured and to improve the stability of tunable diode laser absorption spectroscopy (TDLAS), the scan signal of the TDLAS gas detection system was optimized. Based on the HITRAN database, the absorption peak of methane gas near 1654 nm was selected, and the absorption coefficients of the gas mixture containing methane, water vapor and carbon dioxide were calculated; a visual simulation tool was used to simulate the gas detection system theoretically, and the simulation results were verified by the gas detection system. The results show that the stability of the detection system is improved by optimizing the scanning signal, and the deviation value is reduced from 0.3% to 0.07%; the inverse model of the mean value of the second harmonic signal and the volume fraction of the gas is established, and the correlation coefficient of the linear fit R2=99.99%. This study has a certain reference value for improving the stability and accuracy of the TDLAS system and achieving high stability gas detection. -
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图 1 甲烷、二氧化碳和水蒸气的吸收线强度
Figure 1. Absorption line intensity of methane, carbon dioxide and water vapor
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图 2 常温常压下甲烷、水蒸气、二氧化碳混合气体的吸收系数
Figure 2. Absorption coefficient of a mixture of methane, water vapor and carbon dioxide at atmospheric temperature and pressure
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图 10 不同调制频率下2次谐波的线型和强度
Figure 10. Line shape and intensity of the second harmonic at different modulation frequencies
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