Transmission Emissivity

Electrical cabinets, etc contain different materials of varying emissivity, they can range from .95 to 0.15 and these values can as stated, change with age and temperature. The effects of not setting the correct emissivity is well illustrated in the following graph

The graph below shows how calculated temperature readings change when you vary the emissivity rates. The emissivity rates were changed from .99 to .50 using the same image. This gave a difference of 12.2 °
This demonstrates the importance of knowing the Emissivity rates of the materials you are inspecting.

When installing infrared windows and the equipment is de energized you have an opportunity to mark your targets with known emissivity targets. We offer these in multiple shapes so you can easily identify the phase by the shape.