The possibilities of using broadband sources, as well as an additional wavelength of 630 nm in a lidar-balloon experiment on sensing stratospheric aerosol, are considered, a modification of the calculation procedures according to the Mie theory is carried out, taking into account the parallelization of calculations by wavelengths and particle radii using the tensorflow library, a visual and correlation analysis of the efficiency of using lidar wavelengths and broadband LED sources. The study was supported by the Russian Science Foundation grant No. 23-27-00057, https://rscf.ru/project/23-27-00057.
The analysis of the reconstructed differential optical depth from simulated IPDA lidar signals when detecting carbon dioxide sources from a low-flying vehicle (such as an airplane) is given, estimates of the limiting capabilities and technical characteristics of a possible lidar system are given. This study was supported by the Ministry of Science and Higher Education of the Russian Federation (V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Sciences).
An analysis of the differential optical depth from the lidar signals simulated by IPDA on board the space platform in detecting carbon dioxide sources is presented, and estimates of the limiting capabilities and technical characteristics of a possible lidar system are given. This study was supported by the Ministry of Science and Higher Education of the Russian Federation (V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Sciences).
The results of reconstructing the distribution parameters from aerosol scattering ratios at two wavelengths of 355, 532 nm are considered from experimental data obtained at a small station of high-altitude sounding. This study is carried out with the aim of improving the measurement techniques at the Small Station of High-Altitude Sounding of the V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Sciences. This study was supported by the Ministry of Science and Higher Education of the Russian Federation (V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Sciences).
A brief analysis of works devoted to the detection of greenhouse gas sources using lidars placed on space platforms is given, and the differential optical depth along the sensing path from a spacecraft is estimated for various models of carbon dioxide sources during IPDA sounding at wavelengths in the region of 1.572 μm.
The possibilities of retrieving the mean relative concentration of methane using pseudo-inverse matrices, fully connected and convolutional neural networks based on signals from the Earth received by a 450 km orbit space-based lidar are considered. It is shown that the random error of methane concentration retrieving for lidar with laser pulse energy of 9 mJ and repetition rate 20 Hz, receiving system size of 68 cm, resolution of 50-60 km is not higher than 30 ppb.
A technique is developed for lidar measurements of atmospheric gases on the basis of differential absorption lidar and differential optical absorption spectroscopy. The DIAL-DOAS technique is tested for possibilities of lidar sounding of trace atmospheric gases. Simulation results of lidar measurements of trace atmospheric gases in the 3–4 μm range are described.
Possibilities of measuring the CO2 column concentration by spaceborne integrated path differential lidar (IPDA) signals in the near IR absorption bands are investigated. It is shown that coherent detection principles applied in the nearinfrared spectral region promise a high sensitivity for the measurement of the integrated dry air column mixing ratio of the CO2. The simulations indicate that for CO2 the target observational requirements (0.2%) for the relative random error can be met with telescope aperture 0.5 m, detector bandwidth 10 MHz, laser energy per impulse 0.3 mJ and averaging 7500 impulses. It should also be noted that heterodyne technique allows to significantly reduce laser power and receiver overall dimensions compared to direct detection.
We consider the algorithms that implement a broadband (‘multiwave’) radiative transfer with allowance for multiple (aerosol) scattering and absorption by water vapor. In the spectral range of 0.9 – 0.98 μm, a closed numerical simulation of modifications of the supercontinuum component of a probing femtosecond pulse is performed. The ability of water vapor concentration measurements with white-light femtosecond lidar on the path 100–200 m is discussed.
High measurement sensitivity of troposphere CO2 and CH4 is expected from using of integrated path differential absorption (IPDA) lidar, where the strong lidar echoes on two wavelengths from cloud tops or the Earth’s take place. We consider a software system for the radiation transport simulation in the atmosphere by Monte-Carlo method that applied in the greenhouse gas (CH4 and CO2) sensing space-based IPDA-lidar. This software is used to evaluate the accuracy of measurement of the green house gas concentration. The paper investigates the impact of multiple scattering in presence of clouds. So multiple scattering can influence on signal power, but differential absorption method eliminates this drawback.
The spectral transparency method has been tested experimentally in the terahertz spectral region. The aerosol particle size distribution spectrum has been reconstructed from measurements of the spectral transparency coefficient by the method of Time-Domain THz spectroscopy. The particle size distribution spectra obtained by the spectral transparency method in the terahertz region and by the method of optical microscopy have been compared.
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