Desenvolvimento de um sistema para detecção de dispersóides no ar

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

28/04/2011

RESUMO

The amount of dust suspended in air can be harmful to human health if not complied with the limits previously established by the WHO (World Health Organisation). The air is polluted when it contains elements foreign to its natural composition: oxygen, nitrogen, noble gases and water vapor and even carbon dioxide. The most common forms of air pollution are carbon monoxide (in excess), carbon dioxide (excess), sulfur, nitrogen oxides and particulates by various (dust). In this type of pollution is important to know the size of particles or particulates, chemical composition and geometric shape. Particle size (their diameters) may be greater than 100 micron (one micron is one millionth of a meter), is called settling, ie, fall by gravity, from its launch into the air by emitting source. The quantity "plummeted" settling of these particles is called the "index sujicidade. It is these particles that foul cars, pools, clothes on the clothesline, floors, railings and furniture in the house. The other two types of particles analyzed by their diameter, are suspended particles, these have diameters smaller than 100 micrometer, its main feature is that the drop does not depend on gravity. That is, they are suspended in the atmospheric air. In this group of particles in suspension is an important division to consider: particles larger than 10 micrometer and particles smaller than 10 micrometer. Particles larger than 10 micrometer, when breathed, does not reach our lungs and are retained in the upper airways (nose, pharynx, larynx, trachea) and are expelled without great difficulties, as those less than 10 micrometer can reach the bronchial tree (lung ), being housed there (the alveoli). In this paper we discuss the measurement of macroscopic particles with dimensions above 100 micrometer, using an infrared light source and measuring the effect of scattering of light influenced by the amount of suspended particles in the air, measuring the concentration of particles suspended in air, from allowing these values to monitor / control the levels of particulates in the air.

ASSUNTO(S)

dispersão luz infravermelha partículas dispersoides sedimentáveis ciencia da computacao scattering infrared light particles dispersoids sedimentable

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