Field Guide to Radiometry (SPIE Press Field Guide FG23) by Barbara Grant

By Barbara Grant

Written from a structures engineering standpoint, this SPIE box consultant covers subject matters in optical radiation propagation, fabric homes, assets, detectors, method parts, dimension, calibration, and photometry. Appendices supply fabric on SI devices, conversion components, resource luminance info, and plenty of different matters. The book's association and vast number of diagrams, tables, and graphs will permit the reader to successfully determine and observe proper details to radiometric difficulties bobbing up amid the calls for of ultra-modern fast paced technical surroundings.

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Field Guide to Radiometry 44 Generation of Optical Radiation Lambert–Bouguer–Beer Law and Langley Plot The Lambert–Bouguer–Beer law describes attenuation not only within optical media but also within the atmosphere as well. In this application it expresses the wavelength-dependent irradiance received at a point on earth as a function of the exoatmospheric spectral irradiance: E λ = E oλ e−τo(λ) m where E oλ = exoatmospheric spectral solar (or stellar) irradiance, m = airmass, and τ o(λ) = atmosphere’s optical thickness at that wavelength.

The transfer may occur between two differential elements of area, between a differential element and a finite area, or between two finite areas. The major advantage of configuration factors is the existence of many solved geometries easily accessible in print and on-line catalogues. Configuration factor F is defined generally as F= Φ1→2 Φ1 where Φ1→2 is the power reaching surface 2 from surface 1, and Φ1 is the power leaving surface 1. It is essential that the source surface be Lambertian; its radiance is L s .

Because the source is extended, we do not use its area in computation, as that would have no meaning. At area A 2 , Ω12 is the solid angle subtended by area A 1 (notional surface). ) The area–solid angle relationship is more precisely illustrated with a lens in place. Again using A 2 and Ω12 , the power on the detector is τ L s A1 A2 Φd = τlens L s A 2 Ω12 = lens 2 S In other words, by placing a lens in the system with an extended source, we have reduced the power on the detector by the transmission of the lens.

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