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) is measured in steradians (sr) and describes how large an object appears to an observer from a specific point. Boyd emphasizes the calculation of solid angles to accurately predict how much light a detector will collect from a distant or extended source. Blackbody Radiation and Thermal Sources radiometry and the detection of optical radiation boyd pdf
Φ=L⋅A⋅Ωcap phi equals cap L center dot cap A center dot cap omega is the area of the source and Ωcap omega If you are looking to purchase or find