Methods and systems for sinusoidal signal distortion monitoring and visualization

A method, comprising:

• differentiating an input signal from a sinusoidal signal at substantially a same fundamental frequency of the input signal, the input signal comprising a sinusoidal waveform having distortions;
• calculating a distance index from the input signal to a derivative of the input signal to reveal distortions in the input signal;
• and
• displaying the distortions in the input signal.

A non-transitory computer readable medium comprising instructions that, when executed by one or more processors, directs the one or more processors to:

• differentiate an input signal from a sinusoidal signal at substantially a same fundamental frequency of the input signal, the input signal comprising a sinusoidal waveform having distortions;
• calculate a distance index from the input signal to a derivative of the input signal to reveal distortions in the input signal;
• and
• display the distortions in the input signal.