Lidar measurements accuracy of the hydrofluoride molecules concentration in the atmospheric boundary layer

2020 ◽  
pp. 29-33
Author(s):  
V.E. Privalov ◽  
V.G. Shemanin
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Relative Error ◽  
Concentration Level ◽  
Photon Counting ◽  
Raman Lidar ◽  
Height Range ◽  
Lidar Measurements ◽  
Counting Mode ◽  
Photon Counting Mode

The Raman lidar measurements accuracy of hydrofluoride molecules in the atmospheric boundary layer has been estimated in the work at the concentration level of 1014 сm–3and higher in the height range up to 1,5 km in the synchronous photon counting mode. It is received that it can measure the studied molecules concentration at the level of 1,5∙1014 сm–3 with the concentration measurement relative error lesser than 25 % at the 405 nm wavelength and the ranging distance up to 500 m by such a lidar.

scholarly journals Зондирование молекул метанола в атмосфере по спектрам комбинационного рассеяния света

2021 ◽  
Vol 129 (8) ◽  
pp. 1048
Author(s):  
В.Е. Привалов ◽  
В.Г. Шеманин
Keyword(s):  
Remote Sensing ◽  
Numerical Solution ◽  
Concentration Level ◽  
Photon Counting ◽  
Laser Wavelength ◽  
Raman Lidar ◽  
Back Scattering ◽  
Counting Mode ◽  
Lidar Equation ◽  
Photon Counting Mode

The Raman back scattering lidar equation for the methanol molecules numerical solution results at the methanol molecules remote sensing in the atmosphere with concentrations in the range 1012 cm-3... 1018 cm-3 at the range distances up to 1000 meters in the synchronous photon counting mode are presented. It is shown that during the measurement time of 1 s with such a Raman lidar at the 405 nm laser wavelength, it is possible to probe the methanol molecules with a concentration level of about 1016 cm-3 at distances up to 600 m.

scholarly journals Лидарная система комбинационного рассеяния света для зондирования молекул водорода в атмосфере

2022 ◽  
Vol 130 (3) ◽  
pp. 395
Author(s):  
В.Е. Привалов ◽  
В.Г. Шеманин
Keyword(s):  
Computer Simulation ◽  
Concentration Level ◽  
Photon Counting ◽  
Raman Lidar ◽  
Optimal Parameters ◽  
Hydrogen Molecules ◽  
Counting Mode ◽  
Lidar Equation ◽  
Photon Counting Mode ◽  
Selection Of

Computer simulation of the Raman lidar equation for measurement of the hydrogen molecules at the concentration level of 1013 cm-3 and higher in atmosphere at the ranging distances up to 100 m in the synchronous photon counting mode and selection of such a lidar optimal parameters have been fulfilled. It is shown that for hydrogen molecules concentration of N(z)=1013 cm-3 measurement at the distances from 5 to 100 m the measurement time t is in the range from 3.83 s to 26.5 min, for measurement of concentration N(z) = 1015 cm-3 - from 38 ms to 15.9 s and for the concentration measurement of N(z) = 1017 cm-3 - already from 0.4 ms to 160 ms, respectively.

scholarly journals Lidar-based remote sensing of atmospheric boundary layer height over land and ocean

2014 ◽  
Vol 7 (1) ◽  
pp. 173-182 ◽  
Author(s):  
T. Luo ◽  
R. Yuan ◽  
Z. Wang
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Marine Boundary Layer ◽  
Mixing Layer ◽  
Layer Height ◽  
Boundary Layer Height ◽  
Lidar Measurements ◽  
Mixing Layer Height ◽  
Atmospheric Radiation Measurement ◽  
Atmospheric Boundary Layer Height

Abstract. Atmospheric boundary layer (ABL) processes are important in climate, weather and air quality. A better understanding of the structure and the behavior of the ABL is required for understanding and modeling of the chemistry and dynamics of the atmosphere on all scales. Based on the systematic variations of the ABL structures over different surfaces, different lidar-based methods were developed and evaluated to determine the boundary layer height and mixing layer height over land and ocean. With Atmospheric Radiation Measurement Program (ARM) Climate Research Facility (ACRF) micropulse lidar (MPL) and radiosonde measurements, diurnal and season cycles of atmospheric boundary layer depth and the ABL vertical structure over ocean and land are analyzed. The new methods are then applied to satellite lidar measurements. The aerosol-derived global marine boundary layer heights are evaluated with marine ABL stratiform cloud top heights and results show a good agreement between them.

scholarly journals Graphics algorithm for deriving atmospheric boundary layer heights from CALIPSO data

2018 ◽  
Vol 11 (9) ◽  
pp. 5075-5085 ◽  
Author(s):  
Boming Liu ◽  
Yingying Ma ◽  
Jiqiao Liu ◽  
Wei Gong ◽  
Wei Wang ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Weather Forecasting ◽  
Correlation Coefficients ◽  
Horizontal Resolution ◽  
Backscatter Coefficient ◽  
Distribution Method ◽  
Boundary Layer Height ◽  
Lidar Measurements ◽  
Ground Based Lidar

Abstract. The atmospheric boundary layer is an important atmospheric feature that affects environmental health and weather forecasting. In this study, we proposed a graphics algorithm for the derivation of atmospheric boundary layer height (BLH) from the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) data. Owing to the differences in scattering intensity between molecular and aerosol particles, the total attenuated backscatter coefficient 532 and attenuated backscatter coefficient 1064 were used simultaneously for BLH detection. The proposed algorithm transformed the gradient solution into graphics distribution solution to overcome the effects of large noise and improve the horizontal resolution. This method was then tested with real signals under different horizontal smoothing numbers (1, 3, 15 and 30). Finally, the results of BLH obtained by CALIPSO data were compared with the results retrieved by the ground-based lidar measurements. Under the horizontal smoothing number of 15, 12 and 9, the correlation coefficients between the BLH derived by the proposed algorithm and ground-based lidar were both 0.72. Under the horizontal smoothing number of 6, 3 and 1, the correlation coefficients between the BLH derived by graphics distribution method (GDM) algorithm and ground-based lidar were 0.47, 0.14 and 0.12, respectively. When the horizontal smoothing number was large (15, 12 and 9), the CALIPSO BLH derived by the proposed method demonstrated a good correlation with ground-based lidar. The algorithm provided a reliable result when the horizontal smoothing number was greater than 9. This finding indicated that the proposed algorithm can be applied to the CALIPSO satellite data with 3 and 5 km horizontal resolution.

scholarly journals Experiments with Silicon Array Detectors in the RGO Coude Spectrograph

1982 ◽  
Vol 67 ◽  
pp. 271-278
Author(s):  
C.F.W. Harmer ◽  
Dianne L. Harmer
Keyword(s):  
Photon Counting ◽  
Royal Greenwich Observatory ◽  
Array Detectors ◽  
Counting Mode ◽  
Photon Counting Mode

Two detector systems, recently developed at the Royal Greenwich Observatory, have undergone tests on the coude spectrograph of the 30-inch telescope at Herstmonceux. The first is an intensified Reticon system, used in a photon counting mode; the second is a directly illuminated, cooled CID.

First Results of an L3CCD in Photon Counting Mode

2004 ◽  
pp. 611-614 ◽  
Author(s):  
Jean-Luc Gach ◽  
Christian Guillaume ◽  
Olivier Boissin ◽  
Cyril Cavadore
Keyword(s):  
Photon Counting ◽  
First Results ◽  
Counting Mode ◽  
Photon Counting Mode

scholarly journals The precision calcium photometer: A New Instrument for Astroseismology

1988 ◽  
Vol 123 ◽  
pp. 521-524
Author(s):  
P. Nisenson ◽  
A. K. Dupree ◽  
R. W. Noyes
Keyword(s):  
Optical Fiber ◽  
Optical System ◽  
Photon Counting ◽  
Image Stabilization ◽  
New Instrument ◽  
Counting Mode ◽  
Photon Counting Mode ◽  
System Characteristics ◽  
Stellar Image

The Precision CAlcium Photometer (PCAP) has been built with characteristics optimized for amplitude astroseismology. The instrument consists of two units: an on-telescope optical system that forms and stabilizes a stellar image onto a 200 micron optical fiber; and a spectrometer unit that accepts the light from the fiber and integrates the Calcium II H and K lines (3968.5 Å and 3933.7 Å), along with adjacent continuum regions, in a photon-counting mode. Some key system characteristics include active image stabilization, a 12-meter optical fiber with ~70% transmission at 3950 Å, and a thermally and mechanically stable spectrometer. A description of the instrument and of laboratory and on-telescope test runs are discussed below.

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