Calibration-free near-infrared methane sensor system based on BF-QEPAS

Ye, Weilin; Liu, Weihao; Luo, Wenxuan; Xiao, Jianhua; He, Linfeng; Huang, Yifei; Zhu, Deguang

doi:10.1016/j.infrared.2023.104784

Cited by 7 publications

(3 citation statements)

References 19 publications

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“…Considering the available instruments, there is an increased interest in developing competitive, calibration-free, real-time and low-cost CH 4 sensors using tunable diode lasers in the near-infrared (NIR) region. These light sources in combination with a small-volume multi-pass cell can be integrated into a compact design OEM module with easy operation as the detection part of a gas sensor [ 24 , 25 , 26 , 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

Real-Time Measurement of CH4 in Human Breath Using a Compact CH4/CO2 Sensor

Lin,

Manalili,

Khodabakhsh

et al. 2024

Sensors

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The presence of an elevated amount of methane (CH4) in exhaled breath can be used as a non-invasive tool to monitor certain health conditions. A compact, inexpensive and transportable CH4 sensor is thus very interesting for this purpose. In addition, if the sensor is also able to simultaneously measure carbon dioxide (CO2), one can extract the end-tidal concentration of exhaled CH4. Here, we report on such a sensor based on a commercial detection module using tunable diode laser absorption spectroscopy. It was found that the measured CH4/CO2 values exhibit a strong interference with water vapor. Therefore, correction functions were experimentally identified and validated for both CO2 and CH4. A custom-built breath sampler was developed and tested with the sensor for real-time measurements of CH4 and CO2 in exhaled breath. As a result, the breath sensor demonstrated the capability of accurately measuring the exhaled CH4 and CO2 profiles in real-time. We obtained minimum detection limits of ~80 ppbv for CH4 and ~700 ppmv for CO2 in 1.5 s measurement time.

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Section: Introductionmentioning

confidence: 99%

Real-Time Measurement of CH4 in Human Breath Using a Compact CH4/CO2 Sensor

Lin,

Manalili,

Khodabakhsh

et al. 2024

Sensors

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“…However, precisely characterizing methane fugitive emissions in oil/gas facilities is a demanding measurement technique within conventional pollution monitoring and control strategies [ 11 ]. Laser spectroscopy techniques, such as tunable diode laser absorption spectroscopy (TDLAS) [ 12 , 13 , 14 ], quartz-enhanced photoacoustic spectroscopy (QEPAS) [ 15 , 16 , 17 ], light-induced thermoelastic spectroscopy (LITES) [ 18 , 19 , 20 ], etc., have garnered significant development in the field of trace methane detection in recent years due to their advantages of high sensitivity, precision, and non-contact measurement capabilities. Ye et al presented a highly sensitive methane-detection system based on beat frequency QEPAS technology, which achieves a minimum detectable limit of 28.35 ppm for methane with an integration time of 114 s [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

“…Laser spectroscopy techniques, such as tunable diode laser absorption spectroscopy (TDLAS) [ 12 , 13 , 14 ], quartz-enhanced photoacoustic spectroscopy (QEPAS) [ 15 , 16 , 17 ], light-induced thermoelastic spectroscopy (LITES) [ 18 , 19 , 20 ], etc., have garnered significant development in the field of trace methane detection in recent years due to their advantages of high sensitivity, precision, and non-contact measurement capabilities. Ye et al presented a highly sensitive methane-detection system based on beat frequency QEPAS technology, which achieves a minimum detectable limit of 28.35 ppm for methane with an integration time of 114 s [ 15 ]. Yufei Ma’s team has successively utilized QEPAS and LITES to achieve ultra-sensitive detection of methane at ppb level concentration [ 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Vertical Distribution Mapping for Methane Fugitive Emissions Using Laser Path-Integral Sensing in Non-Cooperative Open Paths

Wang,

Li,

et al. 2024

Sensors

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Observing the vertical diffusion distribution of methane fugitive emissions from oil/gas facilities is significant for predicting the pollutant’s spatiotemporal transport and quantifying the random emission sources. A method is proposed for methane’s vertical distribution mapping by combining the laser path-integral sensing in non-non-cooperative open paths and the computer-assisted tomography (CAT) techniques. It uses a vertical-plume-mapping optical path configuration and adapts the developed dynamic relaxation and simultaneous algebraic reconstruction technique (DR-SART) into methane-emission-distribution reconstruction. A self-made miniaturized TDLAS telemetry sensor provides a reliable path to integral concentration information in non-non-cooperative open paths, with Allan variance analysis yielding a 3.59 ppm·m sensitivity. We employed a six-indexes system for the reconstruction performance analysis of four potential optical path-projection configurations and conducted the corresponding validation experiment. The results have shown that that of multiple fan-beams combined with parallel-beam modes (MFPM) is better than the other optical path-projection configurations, and its reconstruction similarity coefficient (ε) is at least 22.4% higher. For the different methane gas bag-layout schemes, the reconstruction errors of maximum concentration (γm) are consistently around 0.05, with the positional errors of maximum concentration (δ) falling within the range of 0.01 to 0.025. Moreover, considering the trade-off between scanning duration and reconstruction accuracy, it is recommended to appropriately extend the sensor measurement time on a single optical path to mitigate the impact of mechanical vibrations induced by scanning motion.

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