Thermographers continually have to deal with the issues presented by reflection and emissivity. Electrical cabinets are full of different materials of varying emissivity, they can range from .95 to 0.15 and these values can change with both age and temperature. A simple modification is to standardize emissivity by using materials with a known emissivity. This tutorial discusses emissivity and reflection issues in greater detail and how these are best overcome: http://www.iriss.com/gb/71-emissivity_and_reflection.htm
