scope:

Description of Driving Event:

One of the most important elements for the further improvement of the performance of the magnetooptic imaging instrument is to quantify the contribution of each different mechanism to the obtained image. More experiments were recently performed using a single-layer thick pancake pickup coil so that the distribution of flaw-induced normal magnetic field component may be measured between the test object and the current sheet, as well as at locations above the current sheet. The test used magnetic current sheet, which has very strong skin depth attenuation. As expected, a distribution of strong magnetic fields exists in between the two conducting sheets; no measurable field strength exists above the magnetic current sheet. Further experiments are being conducted with the new pickup coil to establish a firm theoretical base.