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THE AMAZING ACCELEROMETER
THE AMAZING ACCELEROMETER
Single Unit (about $4)
Which way’s up?
http://www.youtube.com/watch?v=KZVgKu6v808#t=246
Basis of the Technology
Another view
Accelerometer Design: Frequency Response
Very low r values = good design
Accelerometer Design: Phase Lag
-f
The Problem with Phase Lag
If not designed properly, phase lag causes the measured signal to deviate from the actual acceleration. (Above example would be for a BAD design.). Ideally, you want to design for zero phase distortion.
Where does damping come from?
c
Dynamic viscosity of air
Squeeze Film Damping: Thin film of air interacts with silicon masses in motion
