Phase difference from 2 signals(HELP!)

[lamela]

 Hi! I'm having trouble finding accurate phase difference between two signals.. one signal is from the input serial communication arduino and the second signal is a simulated signal. I want to find the phase difference between these two. I've googled a lot and found many similar threads of phase difference measurements, but it won't work.

The phase angle from the simulated signal is correct but the reading of the phase angle from the input signal keeps changing and I could not find an exact phase angle or phase difference.

What do you think I should do?

[GerdW]

Hi lamela,

cleaning up your BD still isn't on your priority list, isn't it? 😄

the reading of the phase angle from the input signal keeps changing

I guess the input signal also keeps changing?

What do you expect? What does the signal look like?

On your VI image:

Why do you need ExpressVIs to index a waveform from an waveform array? Why not use IndexArray? (Apart from other questionable items…)

[lamela]

The signal and reading are stable and it is a continous sine wave. All the VI I've found won't work, the phase for the input signal will keep changing, this makes the phase difference ever changing so there is no definite value..

[Dennis_Knutson]

You don't show how you are getting the signal from the arduino. One thing is certain that converting to dynamic data is probably a wasted effort. You have absolutely no timing information. Are you really getting multiple points that it comes as a 1D array or are you just making that up as well.

[altenbach]

Do both signals have the same frequency?

[lamela]

Yes, both have the same frequency! The multiple points from the signal are correct too.

[altenbach]

---

@lamela wrote:

The multiple points from the signal are correct too.

---

Sorry, I have no idea what that means.

[lamela]

I mean the multiple readings from the 1D array I plot from the signal. The signal and reading are stable but the phase keeps changing?

[GerdW]

Hi lamela,

yes, the phase keeps changing when you read just parts of your sine wave (aka no full periods of the sine wave).

[altenbach]

---

GerdW wrote:

yes, the phase keeps changing when you read just parts of your sine wave (aka no full periods of the sine wave).

---

He's looking at the phase difference between two signals, though.