Phasor approach to fluorescence lifetime and spectral imaging
Phasor approach refers to a method which is used for vectorial representation of sinusoidal waves like alternating currents and voltages or electromagnetic waves. The amplitude and the phase of the waveform is transformed into a vector where the phase is translated to the angle between the phasor vector and X-axis and the amplitude is translated to vector length or magnitude.
Source: Wikipedia — Phasor approach to fluorescence lifetime and spectral imaging (CC BY-SA 4.0)