Something just occured to me - Light is probably not the best because tissue production is very dusty, so the light sensors will end up covered in dust, unless theyre continually washed off. Regards John ----- Original Message ----- From: "Steve Smith" To: "'Microcontroller discussion list - Public.'" Sent: Monday, September 25, 2006 6:38 PM Subject: RE: [EE]: High Speed Thickness Measurement > This a stupid (maybe) idea (long way out of my field) > > Light permeability > For a lamp of given intensity the translucence of the sheet could be used as > a thickness measurement > > Regards Steve > > -----Original Message-----From: piclist-bounces@mit.edu > [mailto:piclist-bounces@mit.edu] On Behalf Of John > Sent: 25 September 2006 19:41 > To: Microcontroller discussion list - Public. > Subject: [EE]: High Speed Thickness Measurement > > 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 > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist