Atmospheric Observation by a Laser Radar Using Raman Scattering and Mie Scattering

A review is given of laser radar measurements of the atmosphere between about 5 and 100 km based on Rayleigh, Mie, Raman and resonance scattering processes, fluorescence and selective absorption. The results obtained with systems employing ultraviolet and visible wavelengths are examined in relation to the density and temperature structure at stratospheric and mesospheric heights, the changes in the stratospheric aerosol layer following the El Chichon eruption, the characteristics of particles in polar stratospheric clouds and of ice crystals in high-altitude cirrus clouds, and the height distributions of particular constituents. The use of infrared systems with coherent detection has, to date, been restricted to observations of Mie scattering from aerosols at heights up to the lower stratosphere. It seems likely that future developments will bring greater use of near- and middle-infrared wavelengths and probably space-borne laser radar systems.

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Atmosphere Activity Measurement by LED Raman Mini Lidar

EPJ Web of Conferences ◽

10.1051/epjconf/202023707002 ◽

2020 ◽

Vol 237 ◽

pp. 07002

Author(s):

Tatsuo Shiina

Keyword(s):

Raman Scattering ◽

Sea Water ◽

Mie Scattering ◽

Hydrogen Gas ◽

Activity Measurement ◽

Raman Lidar ◽

Gas Concentration ◽

Surface Atmosphere ◽

Scattering Signal ◽

Unique Relationship

The LED mini lidar was improved to monitor Raman scattering echoes. The Raman scattering signal indicates a certain gas concentration and it can distinguish the target from the other materials. It is so weak, 1/1000 of Mie scattering echoes, but even enough to be stimulated from the target gas with LED pulsed beam. At first, we developed a compact Raman lidar with micro pulse DPSS laser to detect hydrogen gas quantitatively. We replaced it with the LED pulse module, which was calculated enough potential to stimulate Raman scattering and detect the target gas. The next task is the activity measurement of such a target gas. To validate the potential of the LED Raman lidar, we conducted the sea surface atmosphere measurement. As a result, the unique relationship between the surface atmosphere and sea water echoes was observed. In this report, we state the concrete specification of the LED mini Raman lidar and some results of the activity observations.

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Effects of various halide ions and probe molecules on inelastic Mie scattering from surface enhanced Raman scattering active surfaces: Determination of particle size distributions from band shapes simulation

The Journal of Chemical Physics ◽

10.1063/1.471735 ◽

1996 ◽

Vol 104 (24) ◽

pp. 9735-9746 ◽

Cited By ~ 10

Author(s):

Nordin Felidj ◽

Jean Aubard ◽

Georges Lévi

Keyword(s):

Particle Size ◽

Raman Scattering ◽

Mie Scattering ◽

Size Distributions ◽

Halide Ions ◽

Particle Size Distributions ◽

Surface Enhanced ◽

Surface Enhanced Raman ◽

Enhanced Raman Scattering

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Macrostructure and microphysics of Saturn's E-ring

International Astronomical Union Colloquium ◽

10.1017/s0252921100101691 ◽

1984 ◽

Vol 75 ◽

pp. 607-613 ◽

Cited By ~ 2

Author(s):

Kevin D. Pang ◽

Charles C. Voge ◽

Jack W. Rhoads

Keyword(s):

Size Distribution ◽

Spherical Shape ◽

Mie Scattering ◽

Narrow Size Distribution ◽

Electrostatic Levitation ◽

Volcanic Origin ◽

Micron Diameter

Abstract.All observed optical and infrared properties of Saturn's E-ring can be explained in terms of Mie scattering by a narrow size distribution of ice spheres of 2 - 2.5 micron diameter. The spherical shape of the ring particles and their narrow size distribution imply a molten (possibly volcanic) origin on Enceladus. The E-ring consists of many layers, possibly stratified by electrostatic levitation.

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