Measurement of oxygen concentration using tunable diode laser absorption spectroscopy

被引：0

作者：

Gao Y. ^{[1
]}

Zhang Y. ^{[1
]}

Chen D. ^{[2
]}

He Y. ^{[1
]}

You K. ^{[1
]}

Chen C. ^{[1
]}

Liu W. ^{[1
]}

机构：

[1] Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, 230031, Anhui

[2] School of Instrument Science and Opto-Electronics Engineering, Hefei University of Technology, Hefei, 230009, Anhui

来源：

Guangxue Xuebao/Acta Optica Sinica | 2016年 / 36卷 / 03期

关键词：

Automatic gain control; Levenberg-Marquardt nonlinear fitting; Oxygen concentration measurement; Spectroscopy; Tunable diode laser absorption spectroscopy;

D O I：

10.3788/AOS201636.0330001

中图分类号：

学科分类号：

摘要：

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. © 2016, Chinese Laser Press. All right reserved.

引用

页数：7

共 14 条

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