SupportGlossary Optical Processes & Properties 

Apparent Optical Properties (AOPs)

Properties that depend both on inherent optical properties (IOPs) and on the light field in which they are measured.

 

The most widely-used AOP is the diffuse attenuation coefficient KdKd is essentially the attenuation experienced by sunlight, and its value depends on depth, sun angle, sky conditions, and shadowing by objects on the surface.  However as depth increases, the influence of the surface illumination characteristics decreases, and Kd eventually reaches an asymptotic value that is in fact an IOP.  Thus the distinction between IOPs and AOPs can sometimes be misleading.

 

In practice, every optical measurement is dependent on the light field used for the measurement, but instruments for IOP measurements provide their own controlled light field rather than relying on ambient light.

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