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I'm actually working on developping a phase shift sensor using one phase modulated signal, i know that the title is confusing beaucause the phase shift measurement need two signals , i'm trying to do this with the zero crossing method so if I could found the timestamps of the zero crossing or the signal's trigger crossing i will be able to calculate the phase shift using the formula in the attached file,

ti is the period of the signal and ti+1 is the double period.

I need some theoritcal ressources about this or some advices about this problem.

Thank you in advantage.

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# Phase shift measurement using phase modulated signal

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