Sensitive methane detection based on quartz-enhanced photoacoustic spectroscopy with a high-power diode laser and wavelet filtering

Liu, Yu; Wang, Ruozhu; Tittel, Frank K.; Ma, Yufei

doi:10.1016/j.optlaseng.2020.106155

Cited by 77 publications

(35 citation statements)

References 29 publications

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“…The metal film coated on the surface of the QTF is used to collect the generated electrical charges [ 9 ]. Due to the advantage of high sensitivity and compact structure, QEPAS is widely used today in the detection of numerous gases [ [10] , [11] , [12] , [13] , [14] , [15] , [16] , [17] ]. The QTF in QEPAS sensor needs to be placed inside the gas analyte [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Trace gas sensing based on multi-quartz-enhanced photothermal spectroscopy

Qiao

et al. 2020

Photoacoustics

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A multi-quartz-enhanced photothermal spectroscopy (M-QEPTS) based trace gas detection method is reported for the first time. Different from traditional QEPTS sensor employing a single quartz tuning fork (QTF) as a photothermal detector, two QTFs were used in M-QEPTS to increase the signal amplitude by adding the generated piezoelectric signals. The coating film of the QTFs was removed in order to improve the laser absorption and transmission. Acetylene (C 2 H 2 ) was chosen as the target analyte. Wavelength modulation spectroscopy (WMS) and 2nd harmonic detection were utilized for the concentration detection. Limit of detection (LoD) of 0.97 ppm was achieved with a 1 second integration time for the M-QEPTS sensor, which realized a 1.51 times signal enhancement compared to a traditional QEPTS sensor employing a single QTF. By using an Allan deviation analysis approach, LoD of 0.19 ppm for an optimum integration time of 200 s was obtained.

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Section: Introductionmentioning

confidence: 99%

Trace gas sensing based on multi-quartz-enhanced photothermal spectroscopy

Qiao

et al. 2020

Photoacoustics

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“…The detection limits and measurement precision of the developed d -PAS were evaluated using a time series measurement of N 2 filled in the photoacoustic cell [ 42 , 43 ]. The time resolution of each measurement was 1 s. Fig.…”

Section: Resultsmentioning

confidence: 99%

Development of a 443 nm diode laser-based differential photoacoustic spectrometer for simultaneous measurements of aerosol absorption and NO2

et al. 2021

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Measurement of ambient aerosol and nitrogen dioxide (NO 2 ) is important as they are major pollutants from the burning of fossil fuel and biomass. In the present work, a differential photoacoustic spectrometer (D-PAS) was developed for simultaneous, online measurements of aerosol optical absorption and NO 2 concentration. A novel photoacoustic resonator was designed and employed in the D-PAS for controlling a large flow rate, improving response time, and keeping the flow noise at a low level. The detection limits of 1.0 Mm −1 and 0.87 ppb for aerosol absorption and NO 2 concentration measurements were achieved with a lock-in amplifier time constant of 1 s. The D-PAS accuracy was demonstrated by performing a long-time, continuous measurement of aerosol, and NO 2 in ambient air. The measured results of NO 2 are consistent with the NOx analyzer and environmental monitoring station results.

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“…Multiple strategies and methods have so far been implemented for humidity correction of PA trace-gas sensors [ 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 ]. Here, we develop a calibration framework based on a simple learning-based method for quantifying the influence of humidity on photoacoustic carbon-dioxide concentration measurements.…”

Section: Introductionmentioning

confidence: 99%

Calibration of Quartz-Enhanced Photoacoustic Sensors for Real-Life Adaptation

Christensen¹,

Balslev-Harder²,

Nielsen³

et al. 2021

Molecules

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We report on the use of quartz-enhanced photoacoustic spectroscopy for continuous carbon-dioxide measurements in humid air over a period of six days. The presence of water molecules alters the relaxation rate of the target molecules and thus the amplitude of the photoacoustic signal. Prior to the measurements, the photoacoustic sensor system was pre-calibrated using CO2 mole fractions in the range of 0–10−3 (0–1000 ppm) and at different relative humidities between 0% and 45%, while assuming a model hypothesis that allowed the photoacoustic signal to be perturbed linearly by H2O content. This calibration technique was compared against an alternative learning-based method, where sensor data from the first two days of the six-day period were used for self-calibration. A commercial non-dispersive infrared sensor was used as a CO2 reference sensor and provided the benchmark for the two calibration procedures. In our case, the self-calibrated method proved to be both more accurate and precise.

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Sensitive methane detection based on quartz-enhanced photoacoustic spectroscopy with a high-power diode laser and wavelet filtering

Cited by 77 publications

References 29 publications

Trace gas sensing based on multi-quartz-enhanced photothermal spectroscopy

Trace gas sensing based on multi-quartz-enhanced photothermal spectroscopy

Development of a 443 nm diode laser-based differential photoacoustic spectrometer for simultaneous measurements of aerosol absorption and NO2

Calibration of Quartz-Enhanced Photoacoustic Sensors for Real-Life Adaptation

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