A compact gas monitoring system for methane based on photoacoustic spectroscopy

Zhou, Jian; Er, Zhixuan; Gong, Ping; Xie, Lei; Jiang, Xiaokang

doi:10.1016/j.infrared.2022.104186

Cited by 5 publications

(5 citation statements)

References 24 publications

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“…The first‐order resonance frequency (FORF) of the T‐type PAC was matched with that of the piezoelectric ceramic wafer, realizing the dual‐resonance amplification of the photoacoustic signal. The LOD of the sensor for CH 4 was 542 ppb when the integration time was 217 s 36 . However, the above proposed PAC has a low Q value, making it difficult to achieve higher amplification of the photoacoustic signal.…”

Section: Introductionmentioning

confidence: 99%

A dual‐resonance enhanced photoacoustic spectroscopy gas sensor based on a fiber optic cantilever beam microphone and a spherical photoacoustic cell

Zhu,

Guan,

Jiang

et al. 2024

Micro & Optical Tech Letters

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We propose a novel high‐performance dual‐resonance enhanced photoacoustic spectroscopy (DRE‐PAS) gas sensor based on a highly sensitive fiber optic cantilever beam microphone and a high‐Q spherical photoacoustic cell (PAC). The first‐order resonant frequency (FORF) of the spherical PAC is analyzed by finite element analysis to match the FORF of the cantilever microphone for the double resonance enhancement of the photoacoustic signal. The photoacoustic spectroscopy (PAS) system, including the DRE‐PAS sensor, a 1532.8 nm distributed feedback laser, and a high‐speed spectrometer, has been successfully exploited for trace acetylene (C2H2) detection. The experimental results show that the limit of detection (LOD) is 106.8 parts‐per‐billion (ppb) with an integral time of 1 s, and the LOD can be further reduced to 11.03 ppb by Allan‐Werle deviation for 100 s integral time. The normalized noise equivalent absorption coefficient can be obtained as 2.44 × 10−8 cm−1 WHz−1/2. The reported DRE‐PAS gas sensor has the superior characteristics of photoacoustic signal enhancement, high sensitivity, and strong antielectromagnetic interference capability, which can provide a new solution for PAS development.

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Section: Introductionmentioning

confidence: 99%

A dual‐resonance enhanced photoacoustic spectroscopy gas sensor based on a fiber optic cantilever beam microphone and a spherical photoacoustic cell

Zhu,

Guan,

Jiang

et al. 2024

Micro & Optical Tech Letters

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“…Therefore, the accurate measurement of methane concentration is of great importance for industrial production and environmental protection. , At present, the mainstream methane gas detection technologies mainly include catalytic combustion, electrochemical, thermal conductivity, and gas spectroscopy-based detection technologies. , Spectroscopic detection techniques are becoming increasingly popular among researchers because of their fast response, high selectivity, high sensitivity, and noninvasive real-time measurements . Laser spectroscopy techniques include tunable diode laser absorption spectroscopy (TDLAS), cavity decay spectroscopy (CRDS), photoacoustic spectroscopy (PAS), etc. After obtaining the spectra of the target molecules, the concentrations can be directly calculated by linear or nonlinear fitting of the spectra .…”

Section: Introductionmentioning

confidence: 99%

“… 7 , 8 Spectroscopic detection techniques are becoming increasingly popular among researchers because of their fast response, high selectivity, high sensitivity, and noninvasive real-time measurements. 9 Laser spectroscopy techniques include tunable diode laser absorption spectroscopy (TDLAS), 10 cavity decay spectroscopy (CRDS), 11 photoacoustic spectroscopy (PAS), 12 etc. After obtaining the spectra of the target molecules, the concentrations can be directly calculated by linear or nonlinear fitting of the spectra.…”

Section: Introductionmentioning

confidence: 99%

Dual-Comb Gas Sensor Integrated with a Neural Network-Based Spectral Decoupling Algorithm of Overlapped Spectra for Gas Mixture Sensing

Chi

Tian

et al. 2023

ACS Omega

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Cross-interference among absorptions severely affects the ability to achieve accurate gas concentration retrieval through gas molecular specificity. In this study, a novel dual gas sensor was proposed to separate methane and water absorbance from the blended spectra of their mixture in the mid-infrared (MIR) band by employing a neural network algorithm. To address the scarcity of experimental data, the neural network was trained over a simulated data set constructed with the same distribution as the experimental ones. The system takes advantages of the broadband spectra to provide high-quality comb data and allows the neural network to establish an accurate spectral decoupling function. In addition, a feature absorption peak screening mechanism was proposed to achieve more accurate concentration retrieval, which avoids the prediction error introduced by interrogating the only peak of the separated spectra. The promising results of the systematic evaluation have demonstrated the feasibility of our methods in practical detections.

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“…Compared with the other two methods, gas detection method has the advantage of probing fire disaster at an early stage by detecting the characteristic gas released, such as carbon dioxide (CO 2 ), which holds merits of high sensitivity, high selectivity and fast response. 5,6 Photoacoustic effect was discovered by Bell in 1880. 7 Due to the characteristics of zero-background noise, 8 antielectromagnetic interference, 9,10 wide dynamic range, 11,12 photoacoustic spectroscopy (PAS) is widely used for trace gas detection.…”

Section: Introductionmentioning

confidence: 99%

“…Various detection methods, mainly including photosensitive detection method, 2 smoke sensitive detection method, 3 and gas detection method, 4 have been adopted to detect fire. Compared with the other two methods, gas detection method has the advantage of probing fire disaster at an early stage by detecting the characteristic gas released, such as carbon dioxide (CO 2 ), which holds merits of high sensitivity, high selectivity and fast response 5,6 …”

Section: Introductionmentioning

confidence: 99%

Development of a mid‐infrared early fire detection system based on dual optical path nonresonant photoacoustic cell

Lu,

Li,

Song

et al. 2023

Micro & Optical Tech Letters

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A mid‐infrared carbon dioxide (CO2) sensor system was developed for early fire detection based on photoacoustic spectroscopy. A miniaturized nonresonant photoacoustic gas cell was optimized by means of finite element method (FEM). A cylindrical cell was optimized with a radius of 12.7 mm and a length of 32 mm. An approximately proportional relationship between the optical path length and the amplitude of the photoacoustic signal was observed by theoretical analysis. The optimal modulation frequency was determined to be 44 Hz. A dual optical path was adopted to gain a low limit of detection (LoD) and a high sensitivity. The amplitude of the photoacoustic signal was increased by 1.8 times compared to single optical path. The LoD of the sensor system was measured to be 4.1 ppmv at an averaging time of 84 s.

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A compact gas monitoring system for methane based on photoacoustic spectroscopy

Cited by 5 publications

References 24 publications

A dual‐resonance enhanced photoacoustic spectroscopy gas sensor based on a fiber optic cantilever beam microphone and a spherical photoacoustic cell

A dual‐resonance enhanced photoacoustic spectroscopy gas sensor based on a fiber optic cantilever beam microphone and a spherical photoacoustic cell

Dual-Comb Gas Sensor Integrated with a Neural Network-Based Spectral Decoupling Algorithm of Overlapped Spectra for Gas Mixture Sensing

Development of a mid‐infrared early fire detection system based on dual optical path nonresonant photoacoustic cell

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