Hi Guys

I would like some suggestions for a thickness measurement project that I
have in mind. Its purpose when built will be to measure the thickness of
tissue coming out of a paper machine - ave speed 1500m/min

The standard means involve radioactive sensors or laser. Does anyone have
any suggestions for alternatives?

I am planning to base the design around an ARM processor. It needs to
provide a data stream, a digital output to show a warning alarm, a digital
output for paper break, aswell as a configurable 4-20mA output. The data
stream will be fed into a Honeywell DCS.

My main concern at this stage is choosing the measurement head - maybe even
designing one. I feel that it may need an array of sensors spread across the
sheet so that the even-ness of the sheet can be measured too. The
measurement heads could be mounted on an oscillating arm if need be.

Regards

John

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