Using accelerometer for FFT of guitar soundboards

[rocky111]

Hi I want to use a miniature single axis accelerometer to record guitar soundboards resonances.
I'm considering buying a used one from ebay (PCB 352A21 10mv/g). But from what I have read they have a rather limited life span, is this the case, Or can they simply be sent off to be re-calibrated?
Also if I buy accelerometer, signal conditioner and connecting leads, could I simply just plug it in to my soundcard and start recording, or do I need anything else such as calibration equipment ect.

 

[GregLocock]

I've used 10 year old accels quite happily. we get ours calibrated once a year. I think for investigative use rather than legal orhomologation that having a calibrator is a bit unneccessary. We used to calibrate every mic channel every day but it isn't really necessary.

That is avery insensitive accelerometer you'd be much better off with a larger one. although that will affect your results due to mass. ideally you'd use a non contacting method such as capacitve or laser. or even a close coupled mic.

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

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[rocky111]

Yes that is the problem too much mass would effect the resonance, clearly accelerometers just aren't the way to go so I guess I'l stick with my condenser mic.
cheers
Alf

 

[Hatch]

Interesting article on this topic by Bruel & Kkaer. See link.

http://www.bksv.com/NewsEvents/Waves/Waves_2014_1/07-guitar-evolution

 

[IRstuff]

How much are you willing to spend? Something like this can do 2kHz measurements, which should be able to detect resonances up to 500Hz:

https://www.mysick.com/partnerPortal/ProductCatalog/DataSheet.aspx?ProductID=83129

There may be other choices that would be cheaper.

TTFN
faq731-376

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