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Gas Absorption Center-Based Wavelength Calibration Technique in QEPAS System for SNR Improvement

  • Zongliang Wang
  • Jun Chang
  • Qi Liu
  • Cunwei Tian
  • Qinduan Zhang
Open Access
Regular
  • 15 Downloads

Abstract

A simple and effective wavelength calibration scheme is proposed in a quartz enhanced photoacoustic spectroscopy (QEPAS) system for trace gas detection. A reference gas cell is connected an InGaAs photodetector for detecting the absorption intensity peak caused by the gas to calibrate the gas absorption center using distributed feedback laser diode (DFB-LD) with sawtooth wave driver current. The gas absorption wavelength calibration and gas sensing operations are conducted at a special internal to eliminate the wavelength shift of DFB-LD caused by the ambient fluctuations. Compared with the conventional wavelength modulation spectroscopy (WMS), this method uses a lower lock-in amplifier bandwidth and averaging algorithm to improve signal noise ratio (SNR). Water vapor is chosen as a sample gas to evaluate its performance. In the experiments, the impact of sawtooth wave frequency and lock-in amplifier bandwidth on the harmonic signal is analyzed, and the wavelength-calibration technique-based system achieves a minimum detection limit (MDL) of 790 ppbv and SNR with 13.4 improvement factor compared with the conventional WMS system.

Keywords

QEPAS DFB-LD wavelength calibration fiber gas sensor 

Notes

Acknowledgment

This work was supported by Research Fund for the Doctoral Program of Liaocheng University (Grant No. 318051543) and the National Natural Science Foundation of China (Grant No. 61475085).

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Copyright information

© The Author(s) 2018

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Authors and Affiliations

  • Zongliang Wang
    • 1
  • Jun Chang
    • 2
  • Qi Liu
    • 1
  • Cunwei Tian
    • 1
  • Qinduan Zhang
    • 2
  1. 1.School of Physics Science and Information Technology and Shandong Key Laboratory of Optical Communication Science and TechnologyLiaocheng UniversityLiaochengChina
  2. 2.School of Information Science and Engineering and Shandong Provincial Key Laboratory of Laser Technology and ApplicationShandong UniversityJinanChina

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