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هر آنچه از برق می خواهید - ljk
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Abstract

High-energy cosmic rays produce extensive showers in the atmosphere,

which can either be detected on the ground or through fluorescence

light produced by charged particles traversing the atmosphere.

The latter detection technique used in Pierre Auger Observatory

requires continuous monitoring of light absorption between

the fluorescence source and the detector. The LIDAR system uses UV

laser beam of similar wavelength to probe a specific region of the atmosphere.

The beam back-scatters on haze and aerosols, while the

reflected light is collected with a mirror onto a photomultiplier read

by a computer. The pulse shape analysis gives absorption-coefficient

map of the sky. A simple system to measure relative absorption coefficient

is presented in the paper.