Title: THE RELATION BETWEEN MEASURED VALUE OF MAGNETIC FLUX LEAKAGE AND SENSOR SIZE
Abstract:The size of magnetic sensor influences the detectability of defect and the evaluation of magnetic flux leakage quantity. However the relation between the sensor size and the measured value of magnetic...The size of magnetic sensor influences the detectability of defect and the evaluation of magnetic flux leakage quantity. However the relation between the sensor size and the measured value of magnetic flux leakage has not been clarified quantitatively so far. In the present report, five Hall elements of different sizes are used as the magnetic sensor and the value of the normal component of magnetic flux leakage is experimentally obtained on a structural steel with an artificial defect or a fatigue crack. The effect of the sensor size on the results are discussed. It is clearly shown that the measured value of magnetic flux leakageis large in a smaller sensor, and the influence of sensor size on the measured value of magnetic flux leakage is large in a smaller lift-off value. An experimental equation is proposed for the relationship among the magnetic flux leakage,sensor size, lift-off distance and defect size. It is alsoconfirmed that the influence of sensor size on the measured value of magnetic flux leakage for a fatigue crack shows the similar tendency to that of artificial defects.Read More
Publication Year: 1992
Publication Date: 1992-06-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 1
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