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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.

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Broken Wing.jpg

Chieh Cheng
Mon, 21 Mar 2005 16:17:39 -0800

Thats how they do it in Hoya Filter's catalog. The one where a circuit diagram with spilled coffee on it were salvaged.
Interesting is it not? If you use the RM 90 you could even filter out synthetic cloth material (eg. swim suits). Thats how they do "X-Ray cameras".

Sun, 15 May 2005 22:25:30 -0700

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Title: infrared detector
Weblog: GearHack
Excerpt: Do you want to determine whether your infrared devices are working? Since infrared light is not visible to our naked eyes, it makes it difficult to determine if your infrared remote control or your computer's IrDA port is transmitting infrared signal. However, if you have a digital camera (a comm . . .
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Weblog: Camera Hacker
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