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The Coffee Cup Test

A simple way to check the transmission rate, of an IR window is to do the “coffee cup test”. Note that this test should be completed both on initial install - and
during regular window maintenance for windows that use materials that are known to degrade over time.

1. Get a cup of warm water, and place a target of known emissivity on the cup surface (electrical tape, emissivity label).

2. Set the camera’s transmission (if available) and Emissivity to 1.0.

3. Measure the temperature of the target without the window.

4. Place the window in front of the camera and complete the exercise again.

5. Using either the camera, or the camera reporting software, change the transmission coefficient on the image until the adjusted temperature is the same as the original image temperature.

6. Record the new transmission rate on the window label and in the report template for future use.

Tip provided by IRISS, inc

Tel: +1 (941) 907-9128 

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