DennisH
Joined: 03 Jun 2008
Posts: 1
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 03 Jun 2008 18:28 Wavelength question |
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Hi all,
I have a simple quesiton I believe. I am not an Engineer, but I am pretty good at math. Well, I have a signal in which I want to find the average wave length. I plan on smoothing the data points (using the average of a window) as well as performing a Fourier Trans. However, after that I can not find what is the best way to find the average wave length per unit time. Any help or a point in the right dircetion would be greatly appreciated.
Thank you
Dennis
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bulx
Joined: 07 Aug 2004
Posts: 163
Helped: 23
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| 17 Jun 2008 10:25 Re: Wavelength question |
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Seems you have converted your waveform into the frequency domain by using the FFT, which doesnt look to be necessary to caculate wavelgnth (λ).
To get the wavelength, better to count zero crossings (after you have smoothened out your signal) and average over a sufficently long interval. That will give you the frequency. Assuming this is some sort of electromagentic wave, you get the wavelength as c/λ
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