FIG. 6.

Effect of phase leakage as a function of several parameters. The x axis in all the figures is the ratio of the signal from B (the contaminating signal) to the signal from A at the location Z₀, where A is located. The y-axis presents the difference between the reported vibration displacement amplitude and the actual displacement at location A, due to phase leakage from location B. The actual displacement amplitude of A and B is noted at the top of each panel. The ratio of B to A displacement is the same for each column, and noted at the top. For this figure we show ratios of 5 and 0.05 in sets of two columns; another case, for which the displacements are similar, is treated in the discussion text. Three different phase offsets are analyzed, 0, π/2, and π, as noted at the top of each set of two columns. These were chosen because values close to π typically give the most extreme variations in amplitude and the value of π/2 introduces more harmonics into the reported waveform.