I have collected data from an oscillating system where angle values change over time and I am interested in identifying frequencies in my oscillations.
Given that my sampling frequency is $f_s = 1$ GHz (i.e sampling period of 1 nanosecond), I have provided $f_s$ to the software I am using in order to obtain the DFT because I want the DFT output data to tell me directly what frequencies in Hz are present in my raw data of oscillations.
Is this the correct thing to do? In other words, if I want the DFT output to show me directly, with no manipulations, what frequencies, in Hz, are in my raw data by looking at the peaks in the plotted DFT data, did I do the right thing? Should I have instead normalized my sampling frequency or manipulated it in some other way before providing it to the FFT algorithm?