Site Assessment of Multiple-Sensor Approaches for Buried Utility Detection
Figure 10
Contour plots of spatially unwrapped phase for simulated leak noise in each plot, the x- and y-axes correspond to the axes shown in Figure 8 rotated by 90 degrees; the unwrapped phase is shown in radians; the pipe runs up the centre line in each plot (a) vertical measurements: 42 Hz; (b) horizontal measurements: 42 Hz; (c) vertical measurements: 72 Hz; (d) horizontal measurements: 72 Hz.
