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Portable Eddy Current NDT Instrument Using Two Different Implementations

Pasadas, D. ; Rocha, T. ; Ramos, H. ; Ribeiro, A. L.

Portable Eddy Current NDT Instrument Using Two Different Implementations, Proc Conf. on Telecommunications - ConfTele, Lisboa, Portugal, Vol. 0, pp. 1 - 1, April, 2011.

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Abstract
This paper describes two implementations towards the development of a portable low-cost system capable of detecting defects on metallic surfaces through non-destructive testing. The defect detection is made via an eddy-current probe using a giant magnetoresistor (GMR) sensor. Both approaches use a computer mouse as a position device to locate the probe and deliver a graphical representation to facilitate the defect analysis. One implementation is based on a planar excitation coil, embedded power supplies and the signal processing is made by a dsPIC. The dsPIC controls the signal generation, the measurement procedure and the communication. The defect visualisation can be made in a LCD in real-time or transmitted to a PC. The other implementation uses a low-cost analog system to reduce the data processing required to detect the surface defects. The controller is a PIC microcontroller that does all the analog/digital conversions and transmits the defect data to a PC via wireless channel.