Abstract
This paper presents design and development of a flexible GMR sensor array for nondestructive detection of service-induced defects on the outer surface of 64 mm diameter steel track rope. The number of GMR elements and their locations within saddle-type magnetizing coils are optimized using a three dimensional finite element model. The performance of the sensor array has been evaluated by measuring the axial component of leakage flux from localized flaw (LF) and loss of metallic cross-sectional area (LMA) type defects introduced on the track rope. Studies reveal that the GMR sensor array can reliably detect both LF and LMA type defects in the track rope. The sensor array has a fast detection speed along the length of the track rope and does not require circumferential scanning. It is also possible to image defects using the array sensor for obtaining their spatial information.
Highlights
Track ropes are a type of wire ropes used for transportation of coal in mining industries
The sensor works on GMR effect in which there is a large drop in electrical resistance of multilayer for an incident magnetic field, due to the spin dependent scattering of electrons [16]
The performance of the sensor array has been evaluated by measuring the axial component of leakage fields from two localized flaw (LF) and two loss of metallic cross-sectional area (LMA) type defects in track rope
Summary
Track ropes are a type of wire ropes used for transportation of coal in mining industries. The MFL technique is capable of detecting both LF and LMA type defects in wire ropes [4]. If any defect is present in the rope, the magnetic flux produced in the rope takes a longer path around the defect and as a result, some amount of flux lines leak out of the surface Measurement of this leakage flux using sensors forms an important step in MFL testing. This paper discusses the design and development of a flexible GMR sensor array for detection of damage on the outer surface of the track rope. The performance of the array sensor has been evaluated for fast inspection of track rope and imaging of LF and LMA type defects on the outer Z-wire of the track rope
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