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Accelerometer to measure the loudspekaer's box vibrations
Accelerometer to measure the loudspekaer's box vibrations
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Old 18th July 2014, 01:55 PM   #1
diypass is offline diypass
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Default Accelerometer to measure the loudspekaer's box vibrations

Hello everyone,
I need your advice on the subject of this message.
I would like to buy an accelerometer by the excellent quality/price ratio.
I'll have to measure the vibrations of the cabinet
thanks to those who want to respond
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Old 18th July 2014, 02:04 PM   #2
simon7000 is offline simon7000  United States
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Quote:
Originally Posted by diypass View Post
Hello everyone,
I need your advice on the subject of this message.
I would like to buy an accelerometer by the excellent quality/price ratio.
I'll have to measure the vibrations of the cabinet
thanks to those who want to respond
Digikey’s catalog listed an inexpensive single axis model part #MSP1001 that cost less than $25.00. This seemed the ideal part to play with. It is a small ceramic package with three leads. It is designed to be glued onto a test surface unlike the more general purpose units that can be screwed on. There is even an optional preamp available.
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Old 18th July 2014, 02:08 PM   #3
SY is offline SY  United States
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A tape-on PVDF accelerometer works very well, is easy to use, and has great bandwidth. They are available from the usual sources (Mouser, Digikey) and are cheap.
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Old 18th July 2014, 02:11 PM   #4
diypass is offline diypass
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Quote:
Originally Posted by simon7000 View Post
Digikey’s catalog listed an inexpensive single axis model part #MSP1001 that cost less than $25.00. This seemed the ideal part to play with. It is a small ceramic package with three leads. It is designed to be glued onto a test surface unlike the more general purpose units that can be screwed on. There is even an optional preamp available.
compoared with this :
ACH-01?Vibration Sensors?Piezoelectric Embedded Accelerometers?Measurement Specialties

which has better frequency response ?
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Old 18th July 2014, 02:12 PM   #5
diypass is offline diypass
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Originally Posted by SY View Post
A tape-on PVDF accelerometer works very well, is easy to use, and has great bandwidth. They are available from the usual sources (Mouser, Digikey) and are cheap.
i don'y know what's "tape-on PVDF accelerometer", please explain me
thank you
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Old 18th July 2014, 02:24 PM   #6
SY is offline SY  United States
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They're basically a piece of film, typically a couple of cm on a side, which you can tape on to the panel you're measuring. Google can be your friend here.

If memory serves, they're also made by Measurement Specialties.

edit: Your link is to a packaged version. MSI makes them in other form factors as well.
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Old 18th July 2014, 02:27 PM   #7
diypass is offline diypass
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Originally Posted by SY View Post
They're basically a piece of film, typically a couple of cm on a side, which you can tape on to the panel you're measuring. Google can be your friend here.

If memory serves, they're also made by Measurement Specialties.

edit: Your link is to a packaged version. MSI makes them in other form factors as well.
does it better then this ?
ACH-01?Vibration Sensors?Piezoelectric Embedded Accelerometers?Measurement Specialties
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Old 18th July 2014, 02:35 PM   #8
simon7000 is offline simon7000  United States
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Yes SY the one I pointed to is made by them. It is now up to $40. Unless he can buy in quantity or get a sample the rep network probably won't do much for him. So he can buy it at Mouser or Digikey. They are the distributors.

He might find one on eBay, but he might also get one of the classic versions that are much more difficult to amplify.

But the really cheap anser is to use a guitar pickup. I did once try ceramic capacitors but the guitar pickup had more than 20 dB better sensitivity.
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Old 18th July 2014, 03:50 PM   #9
Bare is offline Bare  Canada
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Old 18th July 2014, 04:42 PM   #10
CharlieLaub is offline CharlieLaub  United States
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Originally Posted by diypass View Post
Hello everyone,
I need your advice on the subject of this message.
I would like to buy an accelerometer by the excellent quality/price ratio.
I'll have to measure the vibrations of the cabinet
thanks to those who want to respond
This is certainly doable and has been done before.

The comment that comes to mind is how you will make use of the measurement. If you put the accelerometer on and measure some amplitude signal, what does that tell you exactly? By itself, its only telling you that some vibrations can be measured. That will always be the case, and it is just a matter of the sensitivity of the accelerometer to measure very small vibrations. Are these things calibrated to some absolute amplitude standard or something - I don't know.

The interesting use would be in RELATIVE measurements, e.g. you measure the cabinet panel vibration, then you try to dampen or stiffen the panel and finally you go back and re-measure at the same spot to see the relative change. This could give you insight into which damping/stiffening method is most effective, and that would be very useful info for sure.
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