Patent ID: 8970211
Filing Date: 2015-03-03
Classification: B65H,G01B,G01D,G01N

Abstract:
1. A pipe inspection system, comprising: a cable storage drum; an axle; a resilient flexible push-cable stored in turns inside the cable storage drum and having a distal end and a proximal end; a retaining plate coupled to the cable storage drum, wherein the cable storage drum is supported by the axle for rotation about an axis; a frame supporting the axle; a magnetic sensor that generates signals representing changes in a magnetic field in at least two orthogonal axes, the magnetic sensor being mounted on one of the frame and the retaining plate; and at least a pair of permanent magnets mounted in spaced apart relationship on the other one of the frame and retaining plate so that the magnetic sensor can detect changes in a composite magnetic field generated by the permanent magnets during relative rotational movement between the magnetic sensor and the magnets.