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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:12 |
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Conference: Bucharest University Faculty of Physics 2006 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
TRANSATMO - atmosferic transmittance measuring system
Authors:
C. Georgescu, D. Ifrimov, R. Medianu, C. Oprea, A. Sobietkii, C. Voiculescu
Affiliation:
IOEL, ANM-RA, INFLPR, ANM-RA, OPTICOAT, IOEL
E-mail
ifrimov@yahoo.com
Keywords:
atmopheric transmittance, measuring system, interference filters
Abstract:
The amount of radiation that reaches the ground after crossing a layer of suspended matter always differs from the one entering the atmosphere at its upper border. The differences are even more obvious when the atmosphere is in a cloudy condition.
The atmospheric transmittance can be used to characterize, for a given time and location, the atmosphere`s capacity to allow sunlight beams to reach the Earth`s ground.
TRANSATMO is a measuring system devised to determine the actual values of atmospheric transmittance.
The measuring and display system includes: (a) the optical reception block (a pyrheliometer equipped with broadband optical filters); (b) narrowband interference filters; (c) light detector on an equatorial mounting; (d) stabilized power source for a reference light bulb. Sun radiation is captured at normal incidence, with caution to avoid circumsolar diffuse radiation.
The TRANSATMO system can detect changes of the atmospheric transmittance thanks to the interference filters it is equipped with, which result following the presence in the Earth`s atmosphere of specific atmospheric constituents such as the atmospheric ozone, water vapor or various pollutants.
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