Acta Optica Sinica, Volume. 36, Issue 3, 330001(2016)
Measurement of Oxygen Concentration Using Tunable Diode Laser Absorption Spectroscopy
The tunable diode laser absorption spectroscopy (TDLAS) technology and oxygen absorption lines near 760 nm are used to realize real-time on-line measurement of oxygen concentration. A detection system based on TDLAS direct absorption technique is designed. In order to solve signal amplitude fluctuation for on- site measurement, an automatic gain control module is designed using voltage controlled amplifier to achieve precise control of the spectrum signal amplitude; generalized Lorentz function is adopted to realize the approximate calculation of Voigt function combining Levenberg-Marquardt nonlinear fitting method to realize fast Voigt profile fitting of the absorbance spectrum curve, to meet the requirement of real-time on-line detection. Experimental results show that the algorithm can achieve Voigt profile fitting of absorbance curve. A fixed concentration of oxygen is continuously measured. Minimum detection limit of the system is 523 × 10-6 m, and standard deviation is 1.75%. Detection system is reliable and meets the real-time on-line oxygen concentration detection applications.
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Gao Yanwei, Zhang Yujun, Chen Dong, He Ying, You Kun, Chen Chen, Liu Wenqing. Measurement of Oxygen Concentration Using Tunable Diode Laser Absorption Spectroscopy[J]. Acta Optica Sinica, 2016, 36(3): 330001
Category: Spectroscopy
Received: Aug. 20, 2015
Accepted: --
Published Online: Mar. 3, 2016
The Author Email: Yanwei Gao (ywgao@aiofm.ac.cn)