Calibration-free wavelength modulation for gas sensing in tunable diode laser absorption spectroscopy
Calibration-free wavelength modulation for gas sensing in tunable diode laser absorption spectroscopy
复制标题
可调谐二极管激光吸收光谱中气体传感的免校准波长调制
DOI：
10.1007/s00340-014-5945-4
复制
发表时间：
2014-12-01
影响因子：
2.1
通讯作者：
Liu, Y. F.
中科院分区：
文献类型：
--
作者：
Lan, L. J.;Ding, Y. J.;Liu, Y. F.
提出了一种利用谱线中心二次谐波和四次谐波之比测量高吸收谱线宽度的方法。然后将测得的线宽应用于“免校准2f/1f”公式中，以检测气体压力和浓度。为了验证该方法，选择CO2在6，982.0678 cm（-1）和H2O在6，979.2995 cm（-1）的跃迁分别测量实验室和现场环境中的线宽、气体压力和浓度。实验结果与预期非常一致。
A method is proposed that employs the ratios of the 2nd and 4th harmonics at the line center to measure line width under high absorption. The measured line width is then applied in the "calibration-free 2f/1f'' formula to detect gas pressure and concentration. To verify this method, the transitions of CO2 at 6,982.0678 cm(-1) and H2O at 6,979.2995 cm(-1) are selected to measure the line width, gas pressure, and concentration in laboratory and field environments, respectively. Experimental results are very consistent with the expectations.