Journal of South China University of Technology (Natural Science Edition) ›› 2021, Vol. 49 ›› Issue (6): 141-148.doi: 10.12141/j.issn.1000-565X.190940

Special Issue: 2021年电子、通信与自动控制

• Electronics, Communication & Automation Technology • Previous Articles    

On Multi-Parameter Influence of TDLAS Detection System Based on LabVIEW

YE Weilin1 TU Zihan1 XIAO Xupeng1 ZHOU Bo1 PAN Yiyu1 ZHENG Zhidan1 WU Tao1 WU Fupei1 XU Yanping2 ZHENG Chuantao3#br#   

  1. 1. Key Laboratory of Intelligent Manufacturing Technology of Ministry of Education∥College of Engineering, Shantou University, Shantou 515063, Guangdong, China; 2. Analysis and Testing Center, Shantou University, Shantou 515063, Guangdong, China; 3. State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, Jilin,China
  • Received:2020-01-02 Revised:2020-07-10 Online:2021-06-25 Published:2021-06-01
  • Contact: 叶玮琳（1984-）,女,博士,副教授,主要从事红外气体传感技术研究。 E-mail:wlye@stu.edu.cn
  • About author:叶玮琳（1984-）,女,博士,副教授,主要从事红外气体传感技术研究。
  • Supported by:
    Supported by the Science and Technology Planning Project of Guangdong Province(2017A020216011,180914204960289)

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Abstract: In the infrared gas detection system based on tunable diode laser absorption spectroscopy (TDLAS), the second harmonic signal is used to calculate the gas percentage by volume. However, this signal is easily influenced by many parameters of the hardware. Based on Lambert Beers law and HITRAN database, this paper used LabVIEW to study the influence of parameters on the amplitude, symmetry and peak width of the second harmonic, and carried out the harmonic optimization simulation experiment. The results show that, for the general TDLAS detection system, the appropriate scanning amplitude and filter order should be chosen firstly, so that the harmonic line would be complete and undistorted. Furthermore, the amplitude and peak width of the harmonic should be increased as much as possible to get the optimal modulation depth. Finally, the suitable modulation and scan frequency should be determined choose according to the system requirements and the hardware conditions.

Key words: second harmonic, infrared detection technology, tunable diode laser absorption spectroscopy technology, harmonic amplitude, harmonic symmetry, harmonic peak width

CLC Number: