Amplitude

Reading the amplitude values of a FFT in ImageJ

Reading the amplitude values of a FFT in ImageJ
  1. How do you find amplitude from FFT?
  2. What does the amplitude of FFT show?
  3. What are the units of amplitude in FFT?

How do you find amplitude from FFT?

1) Division by N: amplitude = abs(fft (signal)/N), where "N" is the signal length; 2) Multiplication by 2: amplitude = 2*abs(fft(signal)/N; 3) Division by N/2: amplitude: abs(fft (signal)./N/2);

What does the amplitude of FFT show?

The amplitude of the FFT is related to the number of points in the time-domain signal. Use the following equation to compute the amplitude and phase versus frequency from the FFT. to its magnitude (r) and phase (ΓΈ) is equivalent to using the preceding formulas.

What are the units of amplitude in FFT?

If you have access to the sensor calibration curve to convert units, the FFT amplitude should be in Teslas per second (T/s), as you look at a derivative. If you look at a power density spectrum (squared), then the units above should be squared as well (mV2 or T2/s2).

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