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研究分布式反馈激光器的温度电流调谐特性及氟化氢气体在近红外波段的吸收线分布特征.利用归一化洛伦兹函数实现Voigt线型快速近似计算,并分析气体吸光度曲线的Voigt线型拟合以及波长扫描气体浓度反演算法.选择1.28μm附近氟化氢气体单根吸收线作为目标吸收线设计可调谐二极管激光吸收光谱系统,对已知标准浓度氟化氢气体配置的不同浓度气体进行测量.系统的检测限达到1.12ppm-m,且具有较高的测量准确度和长期稳定性,满足氟化氢气体实时在线监测的需要.
The temperature and current tuning characteristics of distributed feedback laser and absorption line distribution of hydrogen fluoride gas in the near infrared band were studied.The Voigt linear fast approximation was calculated by normalized Lorentz function and Voigt linear fitting of gas absorbance curve And the wavelength scanning gas concentration inversion algorithm.Selecting the single absorption line of hydrogen fluoride gas near 1.28μm as the target absorption line, a tunable diode laser absorption spectroscopy system was designed to measure the different concentrations of gas with known standard concentrations of hydrogen fluoride gas.Detection of the system Limits to 1.12ppm-m, and has high measurement accuracy and long-term stability, to meet the real-time on-line monitoring of hydrogen fluoride gas needs.