User's Manual

IDS Ingegneria Dei Sistemi S.p.A. N doc: MN/2009/028 - Rev. 1.1

DETECTOR DUO SYSTEM – User manual

7. HOW TO USE THE DETECTOR

The main targets when performing utilities investigations with the

DetectorDuo consist of either extended structures (such as an interface

between layers, pipes parallel to the investigation direction etc.) or

quite small structures (such as pipes perpendicular to the investigation

direction, cavities and rocks etc.).

Fig. 7.1 shows how a flat interface gives rise to a flat trace while a

small structure such as a pipe produces a hyperbolic trace. This is

because the echoes form the flat plane at different values of

take the

same time to reach the DetectorDuo. For the pipe, however, the echoes

from its sides take a longer time to reach the DetectorDuo than the

echoes from its top surface.

Fig. 7.1 – Trace of a pipe perpendicular to the direction of investigation and a flat interface

The aperture of a hyperbola depends on various factors:

DETECTOR

DUO

DETECTOR

DUO

DETECTOR

DUO

DETECTOR

DUO

Pipe

Interface

twt