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Scatter and BSDF Measurements: Theory and Practice

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Understanding the fundamental characteristics of scatter and the limitations imposed by scatterometers is essential to performing meaningful stray light calculations.

Richard Pfisterer, Photon Engineering LLC

Except for direct illumination from the sun, laser, or other light source, everything we see or detect is ultimately scattered light. Light can be scattered or rescattered during its propagation to our eyes or to a detector by rough surfaces, textures, and particulates. This scattered light is essentially “optical noise.” Consequently, the calculation of signal-to-noise (SNR) frequently involves scatter as both desired signal and undesirable noise. Mathematically, scatter is expressed as a bidirectional scatter distribution function or BSDF. The BSDF is defined as where...Read full article

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