Online and Real-Time Measurement of Magnetic Powder Dosage in Magnetic Particles Inspection (MPI) of Materials

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The feasibility of a method to provide assurance of the compliance of inspections of component quality tointernational standards will be assessed. The method applies to magnetic particle inspections which detectcracks in metallic components and involves the use of a high frequency electromagnetic sensor. The sensorresonates at a frequency in the microwave frequency band. The working fluid used in the inspection is a dilutesuspension of ferromagnetic particles, in which each particle is coated with a fluorescent dye. Particles willcollect in the magnetic fields around cracks in the component being inspected and can be found via theirfluorescence. The sensor will measure the concentration of particles in the fluid during the inspection, a sampleof the fluid being drawn from the testing apparatus and pumped through the sensor before being returned tothe testing apparatus. The current method of measuring particle concentration is performed prior toinspections and takes several hours, the new method is a real-time solution which is also more appropriate toautomatic data logging.