In model scattering media, in which the extinction coefficient ε and the probability Λ of photon lifetime vary, the relation between the illumination near a parallel light beam and the optical depth is studied. It is shown that in media of low turbidity, Bouguer's Law holds at small penetration depths, because the scattered radiation is insignificant in comparison to the total energy balance. For beams of finite width, with constant τ, the illumination increases with increasing ε values. The importance of λ in relations describing the attenuation of a parallel light beam in turbid media is clarified.
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Ivanov, A.P., Sherbaf, I.D. Attenuation of a narrow light beam in a turbid medium. J Appl Spectrosc 5, 147–151 (1966). https://doi.org/10.1007/BF00614474
- Total Energy
- Energy Balance
- Penetration Depth