Quote:
Originally Posted by kalee20
This might of course make it ideal as a shock sensor of course, but on reading your post it came across that the magnet/spring is a velocity sensor as against the MEMS being acceleration. It isn't - to get an output from the magnet/spring you have to differentiate velocity twice more!
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The "velocity" was merely the way they described it in Silicon Chip because they were referring to the magnet velocity inside it with respect to the coil and they were trying to explain it to the readers. Obviously if there is no rate of change of magnetic flux in the coil or no relative motion of the magnet in the coil, there would be no signal generated.
So as you point out there has to be a change in acceleration of the sensor body to get signal.So if its in a resting state and gets bumped, there is a change in acceleration, so it makes a good shock sensor.