×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

Jobs

Vibration sensor mounting with high pass propertys

Vibration sensor mounting with high pass propertys

Vibration sensor mounting with high pass propertys

(OP)
I am looking for a material / mounting method for a mems sensor to attenuate frequencys below ~10 hzs while passing the high frequency information.  Any ideas or link would be appreciated.  Thanks,  Mick

RE: Vibration sensor mounting with high pass propertys

Off the top of my head I cannot think of any reliable and simple mechanical method of attenuating low frequencies while passing high frequencies.

If I were you I would look at making a high-pass filter on the accelerometer output.  Go to this link and you can design your own:
http://www.filter-solutions.com/
They have a FREE download for basic filter design or you could spend a couple of bucks and go for the high-spec software.  The components for these filters are inexpensive and easy to build.

Good luck

Ron Frend
tel: 011 44 1253 400541
ron.frend@predicon.net
http://www.predicon.net

RE: Vibration sensor mounting with high pass propertys

Here's a horrible and complicated way!

take two identical charge coupled accelerometers. Turn one upside down. mount the other on a low pass filter (sold by B&K). T the two together into the back of the charge amp.

Sorry about that, it is a terrible approach, but I have used something a bit similar to this.

Cheers

Greg Locock

RE: Vibration sensor mounting with high pass propertys

The CMCP525 (Acceleration) or CMCP530 (Velocity) transmitter with a 10 Hz high pass filter will work with any standard ICP Accelerometer. Unit is small, DIN rail mounted. Provides buffered dynamic output for analysis and 4-20mA output for trending, etc.

http://www.stiweb.com/downloadDataSheets/sti500overview.pdf

RE: Vibration sensor mounting with high pass propertys

(OP)
A friend in the mems sensor business told me that some automotive engineers were using such a material to mount mems sensors to disc brake calipers.  The problem is that strong low frequency signals (road/supendtion noise) would saturate the sensor and no amount of electronic filtering could recover the high frequency signals (brake squeal).  My friend thought it was a ceramic material that stiffened at high frequencys.  Maybe I should post in the materials section?  Thanks for the responces.  Mick

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!


Resources