Remote Sensing of Atmospheric Methane with IR OPO Lidar System

Yakovlev, S. V.; Sadovnikov, S. A.; Kharchenko, О. V.; Kravtsova, N. S.

doi:10.3390/atmos11010070

Cited by 31 publications

(11 citation statements)

References 26 publications

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“…There are a few variations of the DIAL method. The range-resolved DIAL detects the backscattered signal of short laser pulses propagating in the atmosphere from aerosols and gas molecules, providing spatial information of the measured GHG concentration [20][21][22][23]. However, the recorded signal is weak and therefore high-power lasers are required for an adequate signal-to-noise ratio (SNR).…”

Section: Introductionmentioning

confidence: 99%

Autonomous Differential Absorption Laser Device for Remote Sensing of Atmospheric Greenhouse Gases

et al. 2022

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A ground-based, integrated path, differential absorption (IPDA) light detection device capable of measuring multiple greenhouse gas (GHG) species in the atmosphere is presented. The device was developed to monitor greenhouse gas concentrations in small-scale areas with high emission activities. It is equipped with two low optical power tunable diode lasers in the near-infrared spectral range for the atmospheric detection of carbon dioxide, methane, and water vapors (CO2, CH4 and H2O). The device was tested with measurements of background concentrations of CO2 and CH4 in the atmosphere (Crete, Greece). Accuracies in the measurement retrievals of CO2 and CH4 were estimated at 5 ppm (1.2%) and 50 ppb (2.6%), respectively. A method that exploits the intensity of the recorded H2O absorption line in combination with weather measurements (water vapor pressure, temperature, and atmospheric pressure) to calculate the GHG concentrations is proposed. The method eliminates the requirement for measuring the range of the laser beam propagation. Accuracy in the measurement of CH4 using the H2O absorption line is estimated at 90 ppb (4.8%). The values calculated by the proposed method are in agreement with those obtained from the differential absorption LiDAR equation (DIAL).

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Section: Introductionmentioning

confidence: 99%

Autonomous Differential Absorption Laser Device for Remote Sensing of Atmospheric Greenhouse Gases

et al. 2022

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“…The oxide-based crystals KTiOPO 4 (KTP) and KTiOAsO 4 (KTA) are well known and have often been used for generating MIR pulses in the OPO. In 2020, Lidar backscattered signals in the spectral band of 3.30-3.50 μm have been measured and analyzed along the horizontal path in the atmosphere [1] . The tunable MIR laser was generated by KTA and KTP OPOs.…”

Section: Introductionmentioning

confidence: 99%

Narrow-linewidth BaGa4Se7 optical parametric oscillator

Bian¹,

Kong²,

Ye³

et al. 2022

中国光学快报

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The linewidth of the BaGa 4 Se 7 (BGSe) optical parametric oscillator (OPO) was narrowed for the first time, to the best of our knowledge, by inserting a Fabry-Perot (FP) etalon into an L-shaped cavity. When a 15 mm long BGSe (56.3°, 0°) was pumped by a 1064 nm laser, the peak wavelength was ∼3529 nm, and the linewidth was 4.53 nm (3.64 cm −1 ) under type I phase matching. After inserting a 350 μm thick FP etalon, the linewidth was decreased to 1.27-2.05 nm. When the tilt angle of the etalon was 2.34°, the linewidth was 2.05 nm (1.65 cm −1 ), and the peak wavelength was still ∼3529 nm. When the tilt angle of the etalon was 3.90°, the peak wavelength was 3534.9 nm, and the linewidth was 1.27 nm (1.02 cm −1 ), which was the narrowest linewidth of a BGSe OPO, to the best of our knowledge. The beam quality was also improved after inserting the FP etalon.

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“…In the Institute of Atmospheric Optics is developing stationary and mobile lidar systems for studying the gas composition (in particular, methane and carbon dioxide) in the atmosphere [4,5].…”

Section: Introductionmentioning

confidence: 99%

Simulation of the lidar overlap function for a biaxial scheme

Kravtsova

Sadovnikov

2022

28th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics

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The results of computer simulation of the overlap function for a biaxial lidar scheme with different diameters of the receiving part photosensitive zone of the optical system are presented. It is shown at what sizes of the photosensitive zone the full overlap of the telescope field of view and the laser beam is ensured sounding path of up to 1 km. The length of the "dead" zone, when the laser beam propagates parallel relative to the optical axis of the telescope is estimated.

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Remote Sensing of Atmospheric Methane with IR OPO Lidar System

Cited by 31 publications

References 26 publications

Autonomous Differential Absorption Laser Device for Remote Sensing of Atmospheric Greenhouse Gases

Autonomous Differential Absorption Laser Device for Remote Sensing of Atmospheric Greenhouse Gases

Narrow-linewidth BaGa4Se7 optical parametric oscillator

Simulation of the lidar overlap function for a biaxial scheme

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