How dirty is your carpet?
Want to find out how dirty your carpet really is?
Use an infrared camera with an opaque infrared filter, like a RM72. The picture shown below was taken with my Sony DSC-P92 digital camera that has been modified for infrared photography. A RM72 filter was mounted in front of the lens to eliminate all visible light. I shot the following picture for another project and later I noticed all the blotches on the carpet.
Those blotches are not visible by my eyes. I never knew my carpet had those blotches . . . time to get the carpet cleaned.
Thats how they do it in Hoya Filter's catalog. The one where a circuit diagram with spilled coffee on it were salvaged.
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Title: infrared detector
Title: Effect of Infrared in Night Vision Photography
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