Vibration sensor mounting with high pass propertys

[mkent]

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

 

[ronfrend]

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

 

[GregLocock]

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

 

[dgallagher]

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

 

[mkent]

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