The amazing accelerometer
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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. Biomedical. Automotive. Guidance/Navigation. Structural Health Monitoring. Sports Medicine: Concussions. FitBit and Nike Fuel.

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Presentation Transcript


Which way s up
Which way’s up?

http://www.youtube.com/watch?v=KZVgKu6v808#t=246









Fitbit and nike fuel
FitBit and Nike Fuel


Accelerometer Design: Frequency Response

  • Very low r values = good design



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
Where does damping come from?

Dynamic viscosity of air

c

Squeeze Film Damping: Thin film of air interacts with silicon masses in motion


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