Buried Corrosion Detection in Multi-layer Airframe Structures
Substantial enhancements in Pulsed Eddy Current instrumentation and array probes provide a unique capability for the detection and imaging of sub-layer corrosion. The use of giant magnetoresistive (GMR) elements in an inductive array provides increased depth of sensitivity over conventional eddy-curr ent sensing coils. This paper provides an overview of newly developed instrumentation, whic h provides a portable, battery-operated platform for multi-layer corrosion dete ction in flight line or repair facilities. Demonstrated capability includes rapid inspec tion and detection of material loss in lap joints with air gaps and complex geometries. Advanced imaging capability and post-processing allows multi-layer analysis, with distinct C-scan images of up to four (4) 1-mm layers.
OF DIFFERENT FAULTS INFLUENCE OVER OUTPUT SIGNAL FROM PULSED EDDY CURRENT TRANSDUCER
The results of applied output electromagnetic field due to interaction with electromagnetic field of eddy current that is made of the same output field in the investigation object are based on electromagnetic eddy current method. It is successfully applied to: early detection of areas with structural non-homogeneities where appearance of faults is possible, defending of very small defects and the details term exploitation has been evaluated, the degree of attrition of the surface protective layers is qualified. Redistribution of eddy currents is caused to the presence of defects in controlled items. Their changing reaction on force field and modification signal transducer is done. The aim of this work is to investigate the influence of different faults over output signal from pulsed eddy current transducer based on a model that is made in Mag Net 7.4. The results from this investigation can be applied in nondestructive testing.
Industrial inorganic pigments
General Chemical and Physical Properties Behavior of Pigments in Binders White Pigments Titanium Dioxide Zinc Sulfide Colored Pigments Oxides and Hydroxides Cadmium Pigments Bismuth Pigments Ultramarine Pigments Iron Blue Pigments Carbon Black Properties Production Processes Specialty Pigments Magnetic Pigments Anticorrosive Pigments Luster Pigments Transparent Pigments.