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<p>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 (CH<sub>4</sub>) 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&#xa0;nm was developed by combining wavelength modulation spectroscopy (WMS) with second harmonic (2&#xa0;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&#xa0;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&#xa0;s, corresponding to the corresponding normalized noise equivalent absorption coefficient (NNEA) of 3.63 × 10<sup>− 9</sup> <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({\text{c}\text{m}}^{-1}\text{W}/\text{H}\text{z}\)</EquationSource> </InlineEquation>.</p>

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Self-calibration photoacoustic spectroscopy for trace gas detection

  • 期刊论文

  • 发表日期：

    2025年10月13日

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  • Boxuan Chen,
  • Tianbo He,
  • Liang Chen,
  • Zhigang Hu,
  • Jingsong Li

摘要

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 \({\text{c}\text{m}}^{-1}\text{W}/\text{H}\text{z}\) .