Samples

Deciding on the FFT length for water waves in flume (wave facility)

Deciding on the FFT length for water waves in flume (wave facility)
  1. How many samples do I need for FFT?
  2. What is frequency resolution of FFT?

How many samples do I need for FFT?

The number of samples (N) in the FFT must be an integer power of 2. Therefore, N = 2p, where p is a positive integer. This rule minimizes the number of multiplications—and therefore the computation time—needed to compute the coefficients of the Fourier series.

What is frequency resolution of FFT?

Frequency resolution is 10 Hz. The time waveform with length of 0.1 seconds is used for an FFT analysis. The spectrum values are obtained by performing FFT every 10 Hz. The spectrum cannot be obtained with the fractional frequency component values, such as 995, 1001 Hz.

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