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S Krishna Kumar
S Krishna Kumar

Reputation: 91

Getting FRF from FFT

I have the FFT of a sensor output data. Is there any way to get frequncy response function FRF from this. I dont have any input data. Plz help.

Upvotes: 1

Views: 3329

Answers (2)

Daniel Gehriger
Daniel Gehriger

Reputation: 7468

Taking the IFFT (basically the FFT) of the FFT output data will give get you back into the time domain.

Sorry for the above answer, which doesn't address the question. To be more helpful, IIRC, the FRF is the ratio of the FFT of the response (output) to the FFT of the excitation (input). Since you only have the FFT of the output, I'd say that there is no way to obtain the FRF from this alone.

Upvotes: 0

Paul R
Paul R

Reputation: 213059

If you don't have any knowledge of the input data then you can't really calculate the frequency response. However if you happen to know that input signal is e.g. white noise, then you can at least get an approximation of the magnitude of the frequency response.

Upvotes: 2

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