Hi,
I am looking for a reference on the "correct" or "standard" method compute the phase from the X and Y output from a lock in amplifier.
In general, I believe the X and Y signals are centered around 0 V. This, however, causes issues when computing phase because when only noise is fed to the input, the ratio of Y/X can become very large as the X value jumps back and forth across 0 V. My goal is to mitigate such singularities by subsequently digitizing my X and Y signals and then performing the calculation digitally. Or perhaps digitizing the original input and performing all computations digitally, including X and Y.
For example, If I add an offset to the X output after I digitize it, and then take the ratio Y/X, it will prevent such large phase swings when there is no signal. The question is "What is the best offset to use?"
Thanks in advance
Jordan
I am looking for a reference on the "correct" or "standard" method compute the phase from the X and Y output from a lock in amplifier.
In general, I believe the X and Y signals are centered around 0 V. This, however, causes issues when computing phase because when only noise is fed to the input, the ratio of Y/X can become very large as the X value jumps back and forth across 0 V. My goal is to mitigate such singularities by subsequently digitizing my X and Y signals and then performing the calculation digitally. Or perhaps digitizing the original input and performing all computations digitally, including X and Y.
For example, If I add an offset to the X output after I digitize it, and then take the ratio Y/X, it will prevent such large phase swings when there is no signal. The question is "What is the best offset to use?"
Thanks in advance
Jordan