I have an application where I'm trying to measure rather slow linear movements. For example, my device will move only about 1 inch along the X axis (no reference points) over a span of a few seconds. I've tried a 3-axis accelerometer, but the acceleration seems too slow to register any meaningful data. Is there another movement sensor that could pick this up? Would a gyro, IMU, or 6dof-type sensor be more sensitive? I don't need accurate position info, just to know when the device is slowly moving. Could a vibration sensor possibly work? Many thanks!
I think it would have to be something mechanically coupled to the device but referencing a stationary surface. Say like an encoder with a wheel attached that rotates as the devices moves. Or a LVDT sensor.http://www.google.com/search?q=lvdt&hl=en&tbo=d&source=lnms&tbm=isch&sa=X&ei=bDUXUcXbNNHbqwGFvoCoBw&sqi=2&ved=0CAcQ_AUoAA&biw=1058&bih=792