High-sensitivity methane detection based on QEPAS and H-QEPAS technologies combined with a self-designed 8.7 kHz quartz tuning fork

Liang, Tiantian; Qiao, Shunda; Chen, Yanjun; He, Ying; Ma, Yufei

doi:10.1016/j.pacs.2024.100592

Cited by 52 publications

(6 citation statements)

References 72 publications

(59 reference statements)

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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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“…At present, sensors that can be used for sea surface oil spill detection include microwave sensors, optical sensors, laser sensors, and photoacoustic spectroscopy 6–8 sensors, among others. The ultraviolet (UV)-induced fluorescence method has been widely used in many fields for object identification monitoring and quantitative assessment, as it has the advantages of high sensitivity, simple operation, and low false alarm rates.…”

Section: Introductionmentioning

confidence: 99%

Mineral oil emulsion species and concentration prediction using multi-output neural network based on fluorescence spectra in the solar-blind UV band

Gong,

Mao,

et al. 2024

Anal. Methods

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“…For multi-spectral imaging [ 13 ], the disadvantages are that it is selective for gases and requires expensive imagers. Photoacoustic imaging based on photoacoustic spectroscopy [ 14 , 15 , 16 ] is sensitive enough and may provide a new way for gas leak detection. However, this method is only suitable when the type of leaking gas is already known because the gas absorption of the photoacoustic spectroscopy is specific.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Imaging Method for Gas Leak Detection and Localization Using Virtual Ultrasonic Sensor Array

Liang,

Yang,

Feng

et al. 2024

Sensors

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An acoustic imaging method for detecting and locating gas leaks based on a virtual ultrasonic sensor array is proposed and experimentally demonstrated. A scanning sensor array of only two sensors is used to collect the acoustic signals generated by the leakage hole. The matrix of the leakage signal is processed by the cross-power spectrum method to achieve time consistency, afterward, the location of the leakage source can be calculated by the virtual beamforming method. The influence of the number of sensors and the distance between adjacent sensors on the effect of the proposed method are compared and discussed. To verify the effectiveness and operability of the detection and localization method, several experiments were carried out. Furthermore, a series of experiments were conducted to assess the accuracy and stability of this method. The experimental results demonstrate that the proposed method based on a virtual sensor array can achieve highly accurate localization of gas leaks and performs well regarding stability.

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High-sensitivity methane detection based on QEPAS and H-QEPAS technologies combined with a self-designed 8.7 kHz quartz tuning fork

Cited by 52 publications

References 72 publications

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

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

Mineral oil emulsion species and concentration prediction using multi-output neural network based on fluorescence spectra in the solar-blind UV band

Acoustic Imaging Method for Gas Leak Detection and Localization Using Virtual Ultrasonic Sensor Array

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