Sampling rate vs sampling time of FFT I am having some trouble understanding the sampling time and frequency used in the computing of the FFT, and I was wondering if someone could make it clear for me :


The Sampling time: the time in which I took my sample for example 5 minutes, its the difference between the time at which i started taking measures and the time when I was done.
The sampling rate: how many samples do I save per second, which means if I took $N$ sample within $13\textrm{ s}$, my Sampling rate will be $f_s=N/13$.


Is this sampling rate the same as the frequency used when calculating the FFT when creating the frequency axis of the FFT?
The sampling time is the time interval between successive samples, also called the sampling interval or the sampling period, and denoted $T$.

The sampling rate is the number of samples per second. It is the reciprocal of the sampling time, i.e. $1/T$, also called the sampling frequency, and denoted $F_s$.

The frequency axis for the FFT is linked to the number $N$ of points in the DFT and the sampling rate $F_s$. It is defined as $f=k\cdot\frac{F_s}{N}$. With $k$ going up to $N$