Volume 46 Issue 2
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Cong Menglong, Sun Dandan, Wang Yiding. Application of logarithmic transformed-wavelength modulation spectroscopy in gas detection[J]. Infrared and Laser Engineering, 2017, 46(2): 223001-0223001(6). doi: 10.3788/IRLA201746.0223001
Citation: Cong Menglong, Sun Dandan, Wang Yiding. Application of logarithmic transformed-wavelength modulation spectroscopy in gas detection[J]. Infrared and Laser Engineering, 2017, 46(2): 223001-0223001(6). doi: 10.3788/IRLA201746.0223001
shu

Application of logarithmic transformed-wavelength modulation spectroscopy in gas detection

doi: 10.3788/IRLA201746.0223001
  • 1.

    College of Physics and Electronic Information,Inner Mongolia University,Tongliao 028000,China;

  • 2.

    State Key Laboratory on Optoelectrics,Jilin University,Changchun 130012,China

  • Received Date: 2016-06-08
  • Rev Recd Date: 2016-07-10
  • Publish Date: 2017-02-25
  • For the purpose of enhancing the stability and enlarging the dynamic range in trace gas sensing, the conventional wavelength modulation spectroscopy technology was improved by the introduction of logarithmic-transformed data processing method and differential detection circuit. Before the extraction of the gas absorption related harmonics using a lock-in amplifier, the logarithmic-transformation and the differential detection were fulfilled by a homemade receiver. Through the logarithmic-transformation, the optical intensity modulation of the laser emitting was separated from the absorption-induced power attenuation, and then the former was balanced during differential detection. Owing to this two-pronged strategy, each harmonic component of the absorption spectrum can be theoretically captured without the interferences of residual amplitude modulation and harmonic distortion. For the validation of theory, the second harmonic of P(6) absorption line for NH3 was acquired. The experimental temperature and total pressure were maintained at 296 K and 1.01105 Pa, respectively. Under the effective path length of 24.5 cm, a 0.7 ppm (part per million) detection limit was deduced on the assumption that the amplitude of signal was weakened to be equal with the noise. The above results indicate that this scheme is an ideal option for trace gas detection application.
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    [3] Casale M, Simonetti R. Review:near infrared spectroscopy for analysing olive oils[J]. Journal of Near Infrared Spectroscopy, 2014, 22(2):59-80.
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Application of logarithmic transformed-wavelength modulation spectroscopy in gas detection

doi: 10.3788/IRLA201746.0223001
  • 1. College of Physics and Electronic Information,Inner Mongolia University,Tongliao 028000,China;
  • 2. State Key Laboratory on Optoelectrics,Jilin University,Changchun 130012,China
  • Received Date: 2016-06-08
  • Rev Recd Date: 2016-07-10
  • Publish Date: 2017-02-25

Abstract: For the purpose of enhancing the stability and enlarging the dynamic range in trace gas sensing, the conventional wavelength modulation spectroscopy technology was improved by the introduction of logarithmic-transformed data processing method and differential detection circuit. Before the extraction of the gas absorption related harmonics using a lock-in amplifier, the logarithmic-transformation and the differential detection were fulfilled by a homemade receiver. Through the logarithmic-transformation, the optical intensity modulation of the laser emitting was separated from the absorption-induced power attenuation, and then the former was balanced during differential detection. Owing to this two-pronged strategy, each harmonic component of the absorption spectrum can be theoretically captured without the interferences of residual amplitude modulation and harmonic distortion. For the validation of theory, the second harmonic of P(6) absorption line for NH3 was acquired. The experimental temperature and total pressure were maintained at 296 K and 1.01105 Pa, respectively. Under the effective path length of 24.5 cm, a 0.7 ppm (part per million) detection limit was deduced on the assumption that the amplitude of signal was weakened to be equal with the noise. The above results indicate that this scheme is an ideal option for trace gas detection application.

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