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Self-calibration photoacoustic spectroscopy for trace gas detection.

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Title: Self-calibration photoacoustic spectroscopy for trace gas detection.
Authors: Chen, Boxuan1 (AUTHOR), He, Tianbo1 (AUTHOR), Chen, Liang1 (AUTHOR), Hu, Zhigang1 (AUTHOR), Li, Jingsong1 (AUTHOR) ljs0625@126.com
Source: Applied Physics B: Lasers & Optics. Nov2025, Vol. 131 Issue 11, p1-10. 10p.
Subjects: Photoacoustic spectroscopy, Methane, Spectrometry, Distributed feedback lasers, Near infrared radiation, Calibration, Gas analysis
Abstract: In this paper, a self-calibration photoacoustic (PA) spectroscopy analysis technique based on the idle transmitted light intensity was proposed to resolve the key influence of incident light power on PA signal. To demonstrate this proposed gas sensing technique, methane (CH4) was selected as the target gas, a photoacoustic spectroscopy (PAS) gas sensor system based on near-infrared distributed feedback (DFB) diode laser emitting at 1653 nm was developed by combining wavelength modulation spectroscopy (WMS) with second harmonic (2 F) signal detection method. Instead of the expensive optical power meter, a low-cost photodetector (PD) is used to measure the transmitted light signal and serves as the reference signal for the normalization of the PA signal. The experimental results show that the measured WMS-PA-2 F/PD signals have a good immune to the large dynamic fluctuations of the incident light power. The Allan-Werle deviation analysis indicated that a detection limit of 42.1 ppb can be achieved with an average time of 244 s, corresponding to the corresponding normalized noise equivalent absorption coefficient (NNEA) of 3.63 × 10− 9 . [ABSTRACT FROM AUTHOR]
Copyright of Applied Physics B: Lasers & Optics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
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  Data: Self-calibration photoacoustic spectroscopy for trace gas detection.
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  Data: <searchLink fieldCode="AR" term="%22Chen%2C+Boxuan%22">Chen, Boxuan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22He%2C+Tianbo%22">He, Tianbo</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chen%2C+Liang%22">Chen, Liang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hu%2C+Zhigang%22">Hu, Zhigang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Jingsong%22">Li, Jingsong</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> ljs0625@126.com</i>
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  Data: <searchLink fieldCode="JN" term="%22Applied+Physics+B%3A+Lasers+%26+Optics%22">Applied Physics B: Lasers & Optics</searchLink>. Nov2025, Vol. 131 Issue 11, p1-10. 10p.
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  Data: <searchLink fieldCode="DE" term="%22Photoacoustic+spectroscopy%22">Photoacoustic spectroscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Methane%22">Methane</searchLink><br /><searchLink fieldCode="DE" term="%22Spectrometry%22">Spectrometry</searchLink><br /><searchLink fieldCode="DE" term="%22Distributed+feedback+lasers%22">Distributed feedback lasers</searchLink><br /><searchLink fieldCode="DE" term="%22Near+infrared+radiation%22">Near infrared radiation</searchLink><br /><searchLink fieldCode="DE" term="%22Calibration%22">Calibration</searchLink><br /><searchLink fieldCode="DE" term="%22Gas+analysis%22">Gas analysis</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: In this paper, a self-calibration photoacoustic (PA) spectroscopy analysis technique based on the idle transmitted light intensity was proposed to resolve the key influence of incident light power on PA signal. To demonstrate this proposed gas sensing technique, methane (CH4) was selected as the target gas, a photoacoustic spectroscopy (PAS) gas sensor system based on near-infrared distributed feedback (DFB) diode laser emitting at 1653 nm was developed by combining wavelength modulation spectroscopy (WMS) with second harmonic (2 F) signal detection method. Instead of the expensive optical power meter, a low-cost photodetector (PD) is used to measure the transmitted light signal and serves as the reference signal for the normalization of the PA signal. The experimental results show that the measured WMS-PA-2 F/PD signals have a good immune to the large dynamic fluctuations of the incident light power. The Allan-Werle deviation analysis indicated that a detection limit of 42.1 ppb can be achieved with an average time of 244 s, corresponding to the corresponding normalized noise equivalent absorption coefficient (NNEA) of 3.63 × 10− 9 . [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Applied Physics B: Lasers & Optics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1007/s00340-025-08572-2
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      – Code: eng
        Text: English
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        PageCount: 10
        StartPage: 1
    Subjects:
      – SubjectFull: Photoacoustic spectroscopy
        Type: general
      – SubjectFull: Methane
        Type: general
      – SubjectFull: Spectrometry
        Type: general
      – SubjectFull: Distributed feedback lasers
        Type: general
      – SubjectFull: Near infrared radiation
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      – SubjectFull: Calibration
        Type: general
      – SubjectFull: Gas analysis
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      – TitleFull: Self-calibration photoacoustic spectroscopy for trace gas detection.
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            NameFull: Chen, Boxuan
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            NameFull: He, Tianbo
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            NameFull: Chen, Liang
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            NameFull: Hu, Zhigang
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            NameFull: Li, Jingsong
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            – D: 01
              M: 11
              Text: Nov2025
              Type: published
              Y: 2025
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