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Thanks for the information djs. I've ordered their catalog. Is there a way to measure color change over time? The deposit does cause the roll to change color as the deposit layer builds up. I was taking pictures of the roll over time and measuring the color change using a program that can...

Thanks for the info. The Ultrasonic sensor looks promissing. However I think this models voltage output vs. target distance is much to low to detect a change of 1 mm. significantly. Am I wrong on this? Are there any more sensitive?

The roll can be made of hard rubber(red or white in color) or chrome. The material can be synthetic or paper fibers or a organic stickie substance. The build-up will be slow over time, anywhere from 15 minutes to an hour or longer.

I am looking to measure a fiberous deposition that forms on a pressing roll. The thickness of the deposit ranges from 0mm at first, to 1mm thick and can cover the circumference of the roll uniformly or can form in a nonuniform blotchy fashion. The color of the deposition can range from white to...