Using a microphone to measure speed

My problem is that i am trying to measure the speed of a fan using a microphone with labview, any ideas??????

And I thought this would be a tough one....
Input the microphone to your sound card, Run the fan and capture the sound. Send the sound through an FFT. If the microphone is placed near the outside of the blades, facing the output of the fan, you will get a "beat frequency" of the fan blades. This will give you a very low frequency. Divide by the number of blades and 60 and you will get the RPM of the fan.
What you are trying to do is to isolate the frequency that occurs when a fan blade passes in front of the microphone, compressing the air, pushing the cel of the mic in, then the blade passes, decompressing the air (in relative space of course), pulling the cel out. This is a very strong component of the sound you will measure with the mi
crophone, and should be very easy to see in the FFT. If you want to get fancy, you can isolate this peak in the FFT, apply the math to convert it to RPM, and output the fan speed.
Good luck. 'Sounds' like fun...

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