Matthew Bowen

Displacement using accelerometer?

Discussion created by Matthew Bowen on Nov 13, 2007
Latest reply on Jul 2, 2011 by Edward Nauman
Hello,

I've been set the task of calculating the displacement of a moving (in two dimensions - surge and sway) platform relative to its fixed base. The platform will move approx +-2m from the base over a period of a few seconds. I need to measure the displacement to within 5cm over several hours upto possibly a couple of days.

I have read http://www.freescale.com/files/sensors/doc/app_note/AN3397.pdf and understand the calculations involved but i've never used an accelerometer before and am not sure whether in a practical situation the drift/noise will render the system unusable too quickly.

Would something like the MMA7260QT accelerometer with MC9S08QG8 microcontroller fit the bill? I expect we could recalibrate the system every few hours but would it be accurate over even that sort of timespan?

Any suggestions are welcome.

Thank you,
Mat

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