the amazing accelerometer
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: The Amazing Accelerometer](https://reader035.vdocuments.net/reader035/viewer/2022062310/56816770550346895ddc5b64/html5/thumbnails/1.jpg)
THE AMAZING ACCELEROMETER
![Page 2: The Amazing Accelerometer](https://reader035.vdocuments.net/reader035/viewer/2022062310/56816770550346895ddc5b64/html5/thumbnails/2.jpg)
Single Unit (about $4)
![Page 3: The Amazing Accelerometer](https://reader035.vdocuments.net/reader035/viewer/2022062310/56816770550346895ddc5b64/html5/thumbnails/3.jpg)
Which way’s up?
http://www.youtube.com/watch?v=KZVgKu6v808#t=246
![Page 4: The Amazing Accelerometer](https://reader035.vdocuments.net/reader035/viewer/2022062310/56816770550346895ddc5b64/html5/thumbnails/4.jpg)
Basis of the Technology
![Page 5: The Amazing Accelerometer](https://reader035.vdocuments.net/reader035/viewer/2022062310/56816770550346895ddc5b64/html5/thumbnails/5.jpg)
Another view
![Page 12: The Amazing Accelerometer](https://reader035.vdocuments.net/reader035/viewer/2022062310/56816770550346895ddc5b64/html5/thumbnails/12.jpg)
Accelerometer Design: Frequency Response
Very low r values = good design
![Page 13: The Amazing Accelerometer](https://reader035.vdocuments.net/reader035/viewer/2022062310/56816770550346895ddc5b64/html5/thumbnails/13.jpg)
Accelerometer Design: Phase Lag
-f
![Page 14: The Amazing Accelerometer](https://reader035.vdocuments.net/reader035/viewer/2022062310/56816770550346895ddc5b64/html5/thumbnails/14.jpg)
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.
![Page 15: The Amazing Accelerometer](https://reader035.vdocuments.net/reader035/viewer/2022062310/56816770550346895ddc5b64/html5/thumbnails/15.jpg)
Where does damping come from?
c
Dynamic viscosity of air
Squeeze Film Damping: Thin film of air interacts with silicon masses in motion