Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


Methods to determine the minimum amount of acceleration a MEMS accelerometer can measure

Methods to determine the minimum amount of acceleration a MEMS accelerometer can measure

Methods to determine the minimum amount of acceleration a MEMS accelerometer can measure

Hello all,

I'm currently doing research on MEMS accelerometers, frequency range dc to 1000 hz and accelerations less than 3ms^2 (0.306g), in comparisson to piezo electric ones. Since the noise floor of a MEMS sensor is inferior to that of a piezo my goal is to determine the smallest amount of acceleration that a MEMS can measure before the accelerations drown into the noisefloor of the sensor.
I'm using a PAK DAQ that handles the data comming from the piezo and MEMS under test, a signal generator that can generate various signals (sine, sweep, noise, etc) and a shaker. All sensors are attached to a large metal block on rubber feet.
My first guess is to put with noise with a low pass filter set to 1000hz and lower the amplitude untill the noise floor is reached.
Or maybe use a single sine at various frequencies and lower their amplitudes untill the noise floor get's reached.
Does anyone have experience with these kind of measurements and would like to share them with me?
Thanks for any help.

RE: Methods to determine the minimum amount of acceleration a MEMS accelerometer can measure

I'd use a sine wave at various frequencies .Measuring noise floors with white noise is a bit tricky. If you really want to use white noise, measure the coherence between the drive signal and the accelerometer output.


Greg Locock

New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?

RE: Methods to determine the minimum amount of acceleration a MEMS accelerometer can measure

I'm confused, why not simply determine the minimum acceptable acceleration and find an accelerometer that does that?

For examplehttp://www.analog.com/media/en/technical-documenta... would seem to meet your stated requirements of 0.3 g at 1000 Hz with about 30:1 SNR at 2+ kHz

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


White Paper - Smart Manufacturing for Electronics
This white paper describes a transformative approach to electronics manufacturing made possible by the addition of Mentor Graphics to the Siemens family. It describes a completely digitalized strategy that supports both printed circuit board (PCB) and mechanical design and manufacturing, uniting the entire product lifecycle – from idea and production to customers and back. Download Now
White Paper - Considerations for choosing a 3D printing technology
The adoption of 3D printing into major companies’ product development life cycles is a testament to the technology’s incredible benefits to consumers, designers, engineers and manufacturers. While traditional production methods have limitations in manufacturability, 3D printing provides unparalleled design freedom due to the additive method of building parts layer by layer. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close