Non-isotropic Scattering — Lesson 8

This lesson covers the concept of reflectivity and transmittance in the context of layers that scatter light, such as insulation particles or cloud layers. It delves into the mathematical equations used to calculate upward and downward intensities, and how these can be solved using new variables. The lesson also explores the impact of variables such as albedo, angle, and path length on reflectivity. It further discusses the boundary conditions needed to solve for unknowns in the equations. The lesson concludes with an examination of the impact of asymmetric scattering on the overall reflectivity and transmittance of a layer.

Video Highlights

00:58 - Explanation of the general equation for the upward intensities and a similar expression for downward intensities.
08:04 - Discussion on the impact of the single scattering albedo and the asymmetry parameter on the reflectivity and transmitivity of the layer.
17:17 - Explanation of how to derive expressions for reflectivity, transmitivity, and absorptivity of a layer based on basic properties of the particles in the cloud.
40:36 - Discussion on the application of the radiosity-irradiation methodology to derive the layer property.
51:04 - Explanation of how the results derived are relevant for solar collectors and cameras

Key Takeaways

- Reflectivity and transmittance are key properties of layers that scatter light.
- Upward and downward intensities can be calculated using specific mathematical equations.
- Variables such as albedo, angle, and path length significantly impact reflectivity.
- Boundary conditions are crucial for solving unknowns in these equations.
- Asymmetric scattering can significantly alter the overall reflectivity and transmittance of a layer.