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Forums
Engineering
Electrical Engineering
Simple photodiode connected to lock-in amplifier
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[QUOTE="Alpharup, post: 5466891, member: 337937"] As from a third person perspective, you approach is good. This falls into control engineering problem, if am right. For this, a negative feedback is needed. Input impedance of lock in-amplifier may be considered. But, since you are experimenting, find the transfer function of open system(without acousto-optical modulator feedback signal). Figure in both input and required output of the system...Usually for control engineering problems, the neceassy condition is difference between output and input,..ie...error is zero. I would like you to look at something like phase locked loop: [URL]https://en.wikipedia.org/wiki/Phase-locked_loop[/URL]: [/QUOTE]
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Simple photodiode connected to lock-in amplifier
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