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By Palmer, James M.; Grant, Barbara G.
This article covers subject matters in radiation propagation, radiometric resources, optical fabrics, detectors of optical radiation, radiometric measurements, and calibration. Radiometry kinds the sensible foundation of many present functions in aerospace engineering, infrared structures engineering, distant sensing platforms, monitors, noticeable and ultraviolet sensors, infrared detectors of optical radiation, and plenty of different parts. whereas numerous texts separately conceal issues in particular parts, this article brings the underlying ideas jointly in a way compatible for either lecture room educating and a reference quantity that the practising engineer can use.
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Additional info for Art of Radiometry
Other names for the geometry term are view factor, interchange factor, shape factor, form factor, and the term we will utilize, configuration factor. The symbol F is used to denote this quantity, defined by Eq. 49) where Φ1 is the power leaving surface 1 and Φ1→ 2 is the power reaching surface 2 from surface 1. Both power terms are dimensionless. The radiant power terms are further defined as Φ1 = M 1 A1 , where M1 is the radiant exitance in W/m2 leaving surface 1, and A1 its area; and Φ1→ 2 = M 1 cos θ1 cos θ2 dA1dA2 , d2 π ³³ where the radiance term outside the integral is obtained from Eq.
It is cos θ1 cos θ2 dA1dA2 . 46) In this case, the transfer equation can be thought of as the product of a radiance term L and the geometric term expressed by the double integral. The transfer equation can be simplified even further if certain assumptions can be made regarding the radiation geometry: first, that the square of the distance d 2 is much larger than either area A1 or A2, and second, that both areas are on axis, θ1 and θ2 are zero, and their cosines are therefore unity. If these assumptions can be made in conjunction with the Lambertian approximation, the result is the ultimate simplification: Φ1→2 = LAΩ .
The radiant power terms are further defined as Φ1 = M 1 A1 , where M1 is the radiant exitance in W/m2 leaving surface 1, and A1 its area; and Φ1→ 2 = M 1 cos θ1 cos θ2 dA1dA2 , d2 π ³³ where the radiance term outside the integral is obtained from Eq. 32), itself dependent upon the Lambertian approximation. The fraction of radiant power leaving surface 1 that arrives at surface 2 is F12 = cos θ1 cos θ2 1 dA1dA2 , ³³ d2 πA1 which is the configuration factor. The power transferred from surface 1 to surface 2 then becomes Φ1→ 2 = Φ1 F12 = M 1 A1 F12 = πL1 A1 F12 .
Art of Radiometry by Palmer, James M.; Grant, Barbara G.