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The determination of toxic or harmful gases in industrial parks is a challenge to monitoring exhaust contaminants due to the features of complex compositions and ubiquity. Blackbody sources play an important role in simultaneously detecting the multiple gas species in the presence of cross-interfering absorption lines due to their effective ultra-wide wavelength range. Nevertheless, the problem of lower intensity per wavelength and less stability persists as an obstacle for highly sensitive trace gas detection. In this study, a dual optical path (DOP) enhanced differential photoacoustic and spectral detection mode is developed for simultaneously detecting the multiple toxic or harmful gas through augmenting the weak effective absorption signals and suppressing the spurious coherent background noise. Two identical T-type photoacoustic resonators are introduced to enable the differential mode. Neverthelss, the pure optical approach cannot distinguish the absorption characteristics of acetylene (C2H2) with volume fraction 5 × 10–5 even with the DOP enhancement, whereas emerging peaks in the differential photoacoustic (PA) mode reveal the capability of PA spectroscopy to suppress coherent noise. The results demonstrate that the differential PA signal is improved by 1.91 times that obtained by the DOP design. Methane (NH3), acetylene (C2H2) and carbon dioxide (CO2) are used to verify the performance of this DOP enhanced differential PA gas sensor, and the volume fraction of the sensitivity is found to be 7.25 × 10–7 for CO2, 1.84 × 10–6 for C2H2, and 1.43 × 10–6 for NH3 at standard temperature and pressure, which is an order of magnitude higher than the original single mode PA value. Linear PA amplitude responses ranging from 0 to 3 × 10–3 in volume fraction with respect to the three target gases are observed, and the correction coefficients are all greater than 0.995. The DOP enhanced differential PA detection mode compensates for the weakness of the limited sensitivity associated with broadband spectroscopic methods based on blackbody radiator. Thus, the broadband DOP enhanced differential photoacoustic modality is demonstrated to be an effective approach to simultaneous, highly sensitive and selective detection of multiple trace gases.
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Keywords:
- dual optical path enhanced differential mode /
- photoacoustic spectroscopy /
- toxic or harmful gas /
- multiple trace gas detection
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[1] Hyde B P, Carton O T, Toole P O 2003 Atmos. Environ. 37 55
Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
[6] Berbegal C, Khomenko I, Russo P, Spano G, Fragasso M, Biasioli F, Capozzi V 2020 Fermentation 6 55
Google Scholar
[7] Korablev O, Vandaele A C, Montmessin F, et al. 2019 Nature 568 517
Google Scholar
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Google Scholar
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Google Scholar
Sun Y W, Liu W Q, Wang S M, Huang S H, Zeng Y, Xie P H, Chen J, Wang Y P, Si F Q 2012 Acta Phys. Sin. 61 140704
Google Scholar
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Google Scholar
Miao Y P, Le W, Yang F, Lin Y C, Tan Y Z, He H L 2017 Acta Phys. Sin. 66 074212
Google Scholar
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Google Scholar
Dong M L, Zhao W X, Cheng Y, Hu C J, Gu X J, Zhang W J 2012 Acta Phys. Sin. 61 060702
Google Scholar
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Yin X K, Dong L, Wu H P, Liu L X, Shao X P 2021 Acta Phys. Sin. 70 170701
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Google Scholar
Ma Y F 2021 Acta Phys. Sin. 70 160702
Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
[22] Liu L X, Huan H T, Mandelis A, Zhang L, Guo C F, Li W, Zhang X S, Yin X K, Shao X P, Wang D T, 2022 Opt. Laser Technol. 148 107695
Google Scholar
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