Hi guys,
When I was studying about laser vibrometers through Wikipedia, I noticed a vague problem.
Please take a look at the below pic which I have mentioned the question inside it.
The only way to sum 2 frequencies as I know is multiplexing them through a modulator, So how they got the fo+fb+fd just by a beam splitter or by the air/target?!!!
https://en.wikipedia.org/wiki/Laser_Doppler_vibrometer
Thanks
When I was studying about laser vibrometers through Wikipedia, I noticed a vague problem.
Please take a look at the below pic which I have mentioned the question inside it.
The only way to sum 2 frequencies as I know is multiplexing them through a modulator, So how they got the fo+fb+fd just by a beam splitter or by the air/target?!!!
https://en.wikipedia.org/wiki/Laser_Doppler_vibrometer
Thanks
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