Galvanometer rotating scanner - resonant frequency

[watertreader]

Resonant frequency

Hi,

I have a galvanometer rotating scanner. Is it possible to obtain the resonant frequency for the scanner or obtain the frequency response if I only have the step response?

Or how could I obtain them in an experiment?

Thanks

 

[FvM]

Resonant frequency

Yes, if you assume a simple spring-mass system (second order differential equation). You possibly don't see additional modes, most likely above the frequency range of interest anyway

 

[watertreader]

Re: Resonant frequency

Hi,

Is there more detailed explanation? Or examples?

Thanks

 

[nschutten]

Resonant frequency

If the step response shows ringing, then the frequency of this ringing is the resonant frequency.
I also seem to recall from DSP theory that if you perform an FFT of the impulse response (not step response) of a system, that you obtain the frequency response of that system.