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| Nondestructive testing and crack evaluation of ferromagnetic material by using the linearly integrated hall sensor array
Jinyi Lee
The Journal of Mechanical Science and Technology, vol. 22, no. 12, pp.2310-2317, 2008
Abstract : Magnetic flux leakage testing (MFLT), which measures the distribution of a magnetic field on a magnetized specimen
by using a magnetic sensor such as a Hall sensor, is an effective nondestructive testing (NDT) method for detecting
surface cracks on magnetized ferromagnetic materials. A scan-type magnetic camera, based on the principle of
MFLT, uses an inclined Hall sensor array on a printed circuit board (PCB) to detect small cracks at high speed. However,
the wave forms appear in a direction perpendicular to the scan because the sensors are bonded at different gradients
and heights on the PCB despite careful soldering. In this paper, we propose linearly integrated Hall sensors (LIHaS)
on a wafer to minimize these waves and to improve the probability of crack detection. A billet specimen is used
to determine the effectiveness of the LIHaS in multiple crack detection.
Keyword : Magnetic camera; Sensor array; Ferromagnetic; Crack; NDT |
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