I want to make a phase shift laser range finder , but i dont khnow how exactly. please help me ...
You need an optical phase shift detector, yes, such things exist. Another way is a signal impressed on the laser beam that demonstrates the shift between sent signal, and returned signal. You need to know when the signal was sent out, and the time that it returns from the object it was reflected off of. Because the beam will most likely be scattered in this process, you need an optical receiver that can capture the scattered return signal.
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