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Great idea, thank you! This makes in general a lot of sense, I just wonder then why people in most cases bother to use PLLs...
Maybe there are problems regarding the phase information if you are just mixing it like this?
Thanks a lot for your replies!
I use exactly the setup shown here: https://en.wikipedia.org/wiki/Laser_Doppler_vibrometer
My application is measuring vibrations and displacements of different reflecting surfaces.
So in my opinion, the signal should not be amplitude modulated but...
Hi,
I am currently building a heterodyne laser interferometer in a Mach-Zehnder configuration. The output of my photodiodes give a phase (frequency) modulated signal with a carrier frequency of 80 MHz. The modulation signal has a maximal frequency of some KHz.
Because I am completely new to...
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