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Rob Spiegel
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Photo worth 1,000 words
Rob Spiegel   2/24/2012 1:34:02 PM
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Nice article. The photo of the accelerometer against the thread hole of a needle says everything. Now I understand how Motorola was able to get an accelerometer into a cell phone. Amazing.

Ann R. Thryft
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Re: Photo worth 1,000 words
Ann R. Thryft   2/24/2012 2:35:49 PM
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Rob, you're right. That photo really shows how small these things are. What's even more amazing is to then consider how tiny the actual machines are inside this chip (remembering that MEMS stands for micro-electromechanical systems). Tiny accelerometers like these, along with gyrometers, are what make possible the movements of the Japanese flying sphere I wrote about

http://www.designnews.com/author.asp?section_id=1386&doc_id=235083

and probably also the Parrot A.R. Drone

http://www.designnews.com/author.asp?section_id=1392&doc_id=238273


Rob Spiegel
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Re: Photo worth 1,000 words
Rob Spiegel   2/24/2012 2:45:49 PM
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Yes, I remember that the Japanese flying machine was a great story. The size of the accelerometer makes for a wide range of applications. Years ago, Deisgn News flew me out to Research Triangle to do a video interview with Motorola when they included an accelerometer in a phone. It was used for games and to shake the song list to the next song.

Ann R. Thryft
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Re: Photo worth 1,000 words
Ann R. Thryft   2/24/2012 2:50:45 PM
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I read recently that MEMS accelerometers and gyrometers are being used in wearable medical patient monitoring devices, which makes a lot of sense.


Rob Spiegel
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Re: Photo worth 1,000 words
Rob Spiegel   2/24/2012 2:53:28 PM
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I didn't realize accelerometer were getting deployed into medical applications. Make sense. Do you recall what the applications were? Heart monitoring, perhaps.

Charles Murray
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Electronic stability control
Charles Murray   2/24/2012 5:53:43 PM
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Great article. Question: If the speed is insuffient for airbag applications, why is it sufficient for electronic stability control?

apresher
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Reliability
apresher   2/25/2012 7:46:48 AM
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The inherent reliability of these thermal accelerometer due to the absence of moving parts makes them ideal for some designs. Not sure how much these devices will be limited as specialty components or if additional research will enable them to penetrate additional applications.  Seems to be part of the challenge going forward.

Sturat
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Iron
Re: Electronic stability control
Sturat   2/27/2012 10:30:10 AM
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Auto Crash and Rollover Sensing requires higher bandwidth due to the higher da/dt jerk content of crash signals. ESC requires < 1.0 g because lower amplitude and slower da/dt and less rapidly chaning forces are involved. 

Sturat
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Re: Photo worth 1,000 words
Sturat   2/27/2012 10:31:52 AM
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MEMS are being used in surgical robots and computer assisted surgery, such as orthopedic tracking during a knee replacement.

Ann R. Thryft
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Re: Photo worth 1,000 words
Ann R. Thryft   2/27/2012 12:43:37 PM
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Rob, I believe the MEMS accelerometer application had something to do with gauging patients' motion, such as during walking, but I don't recall the exact details.


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