2023
DOI: 10.1016/j.snb.2022.132825
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Simultaneous standoff sensing for methane and hydrogen sulfide using wavelength-modulated laser absorption spectroscopy with non-cooperative target

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Cited by 22 publications
(6 citation statements)
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“…Near-infrared band is a superior choice for miniaturized standoff CH4 sensor development and application, because of the rugged and easy to align fiber-coupled DFB laser diode, the low-cost optical components commercially available in optical communication and the field-tested durability [5] . Hence, the absorption spectrum of CH4 at 6046.95 cm -1 was chosen as the center spectral line of the laser.…”
Section: Small Lightweight Development Of Single-ended Sensorsmentioning
confidence: 99%
“…Near-infrared band is a superior choice for miniaturized standoff CH4 sensor development and application, because of the rugged and easy to align fiber-coupled DFB laser diode, the low-cost optical components commercially available in optical communication and the field-tested durability [5] . Hence, the absorption spectrum of CH4 at 6046.95 cm -1 was chosen as the center spectral line of the laser.…”
Section: Small Lightweight Development Of Single-ended Sensorsmentioning
confidence: 99%
“…Kalman filtering algorithm has been utilized to enhance the detection accuracy of the system by filtering the concentration values detected by the standoff sensors in our previous work. 3 The filtering performance of the algorithm is influenced by four parameters: the initial filter value x ^ k, the initial filter covariance p k , the measurement noise covariance σ V 2 , and the process excitation noise covariance σ W 2. Among these parameters, the measurement error covariance σ V 2 and the process excitation noise σ W 2 covariance are the ones we focus on.…”
Section: Theoretical Basismentioning
confidence: 99%
“…However, following that there is a risk of pipeline leakage during use due to corrosion of steel pipes, mechanical damage caused by construction, unsealing of connectors, and welding joint cracks caused by stress. [3][4][5] Therefore, it is crucial to regularly check its technical condition for leakage detection. For the detection scenario of natural gas pipeline leakage inspection, tunable diode laser absorption spectroscopy (TDLAS) is one of the most attractive technologies, [6][7][8] not only because it can provide high sensitivity, good selectivity, and fast response, but also because it can be used for standoff gas detection, where both the personnel and the detection system are at some distance from the object (e.g., natural gas pipelines) being measured.…”
Section: Introductionmentioning
confidence: 99%
“…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%