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Topic: Building a chassis ear (Read 421 times) previous topic - next topic

ggsxx1

 Hi i'm building a chassis ear. It's an electret microphone that is attached to a metal clamp used to measure vibrations and noises.The first part is easy microphone and amplifier.

 Where i'm having trouble is finding information on Fast fourrier transform or FFT.

I would like to be able to view the signal, to see the frequencies and amplitude either on serial display or a screen.

Suggestions would be greatly appreciated.

Grumpy_Mike


MarkT

Hi i'm building a chassis ear. It's an electret microphone that is attached to a metal clamp used to measure vibrations and noises.The first part is easy microphone and amplifier.
To sense vibration effectively (and accurately) its best to use a specialized sensor, electrets couple to air
well, but not the mounting itself (electret diaphragms are very thin).

To sense vibration of a solid object you ideally want a transducer with a high mass armature that will
try to stay still through inertia as the mounting point vibrates.  Such a transducer will ignore ambient
noises in the air.  The kind of exciter used to drive flat panels of material like a speaker spring to mind
as a possible transducer to experiment with.
[ I will NOT respond to personal messages, I WILL delete them, use the forum please ]

ggsxx1

I will use an electret disc which doesn't use air to make it vibrate. This is what is commonly used on the market right now.


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