Patent ID: 8319494

Claim:
A sensor array for inspecting a wall of a tubular member, the sensor array comprising: a first and a second set of sensor coils, said first and second set of sensor coils each including a first and a second pair of receiver coils and a transmitter coil; said transmitter coil and said first and second pair of receiver coils each being arranged parallel to one another and sharing a common centerline, said transmitter coil being located between said first and second pair of receiver coils; wherein said common centerline is oriented at an angle γ relative to a central longitudinal axis of an inspection tool on which each said set of sensor coils are mounted; the inspection tool having at least two pole magnets being arranged oblique to the central longitudinal axis of the inspection tool; and said first and second set of sensor coils each being located on an external surface of the inspection tool and lying between and substantially equidistant from opposing edges of the at least two pole magnets.