A review of instrument-measuring visibility-related variables
Environmental Monitoring Systems Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, 1980 - Science - 293 pages
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absorption accuracy actinometer aerosol mass concentration aerosol size distributions air sample aperture apparent luminance apparent spectral radiance apparent sun apparent sun radiance artificial light source atmosphere attenuation coefficient backscattering baseline beam calculated calibration Charlson chromaticity collimated color Commercial Availability daytime diagram available diameter direct solar disk distance downwelling Duntley equation error field of view film filter horizon sky human eye illumination incident instrument measures Instrument Name Instrument Output Analysis integrating nephelometer irradiance lamp laser lens lidar light scattered luminous flux Middleton 1952 object observation angle Operating Principle particles photocell photodiode photoelectric photometer photometric cube photomultiplier Photomultiplier detects photopic phototube Physical Specifications polar nephelometer pristine areas pulses pyranometer pyrheliometer Quenzel radiant flux receiver Reference scattering angles scattering coefficient sky radiation solar radiation spectral radiance spectral radiant flux sun photometer telescope thermopile transmission transmissometer variables visual range volume-scattering function watts wavelength xenon
Page ii - US Environmental Protection Agency, and approved for publication. Mention of trade names or commercial products does not constitute endorsement or recommendation for use.
Page iii - This information must include the quantitative description and linking of pollutant sources, transport mechanisms, interactions, and resulting effects on man and his environment. Because of the complexities involved, assessment of specific pollutants in the environment requires a total systems approach that transcends the media of air, water, and land. The Environmental Monitoring...
Page iii - Congress hereby declares as a national goal the prevention of any future, and the remedying of any existing, impairment of visibility in mandatory class I Federal areas which impairment results from man made air pollution.
Page iii - Vegas contributes to the formation and enhancement of a sound monitoring-data base for exposure assessment through programs designed to: • develop and optimize systems and strategies for monitoring pollutants and their impact on the environment • demonstrate new monitoring systems and technologies by applying them to fulfill special monitoring needs of the Agency's operating programs This report presents the second phase of a study to design and verify groundwater quality monitoring programs...
Page 294 - NO. 12. SPONSORING AGENCY NAME AND ADDRESS US Environmental Protection Agency-Las Vegas, NV Office of Research and Development Environmental Monitoring and Support Laboratory Las Vegas, Nevada 89114 13.
Page 137 - On the generality of correlation of atmospheric aerosol mass concentration and light scatter.
Page 144 - The ratio of the extinction coefficient to the mass of atmospheric aerosol particles as a function of the relative humidity.
Page 24 - » approx. 515 mji(extrafoveal vision). Except for red signals a signal can always be detected by extrafoveal vision at a much lower intensity than that required for its color to be appreciated.
Page 154 - The application of the linear system theory of visual acuity to visibility reduction by aerosols.
Page 292 - ... emission or transfer of energy in the form of electromagnetic waves or particles. (2) the electromagnetic waves or particles. NOTE — In general, nuclear radiations and radio waves are not considered in this vocabulary, only optical radiations, that is, electromagnetic...