4017 Several Techniques for Improving the Detection Probability of the Magnetic Camera

Lee, Jinyi; Hwang, Jiseong; Ogawa, Kōichi; Choi, Seho; Jun, Jongwoo; Shoji, Tetsuo

doi:10.1299/jsmemecjo.2006.1.0_963

Cited by 1 publication

(2 citation statements)

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“…The process started from the power switching process to distinguish the responsible sensor lines in units of time. The captured electric signal is concentrated using a magnetic lens to increase signal intensity [10], [47]. However, the recent development of semiconductor technologies improves the signal amplification without a magnetic lens using a differential-type operational amplifier (OP-AMP), making the process more independent.…”

Section: Signal Processingmentioning

confidence: 99%

“…On the other hand, magnetic camera works by utilizing semiconductor-based sensors such as Hall sensor, magnetoresistive (MR) sensor, and giant MR sensor to measure distorted magnetic flux density owing to the presence of crack [8], [9]. Magnetic camera provides real-time visualization of the distribution of LMFD using integrated signal processing consisting of magnetic source, sensor array, magnetic lens, signal processing, and user interface for the inspection display [10]- [13]. Magnetic camera can extend the measurement area up to 3 meters on one cycle which is very beneficial for actual industrial inspections [14].…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Magneto-Optical Faraday Effect Method and Magnetic Camera for Imaging the 2-D Static Leakage Magnetic Flux Density

Dharmawan¹,

Lee²,

Wang³

2022

eJNDT

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Magnetic flux leaks around the defect on the magnetized ferromagnetic specimen. The magnetic flux leakage testing (MFLT) use the magnetic sensor to measure the leaked magnetic flux density (LMFD). The high sensitivity of sensor need to increase the probability of detection (POD). Also the small size and high spatial resolution of sensor need to increase POD and to sizing defect. Uniform and small lift-off are another necessary to increase POD and sizing ability. Also, the real time imaging of magnetic flux density can increase the inspection time. So the period of planned preventive maintenance could reduce. Two dimensional semiconductor-based magnetic sensor array with high spatial resolution satisfies these requirements. Projection of magnetic flux density on a sensor itself would be another method. We compare the magnetic camera and the magneto-optical Faraday effect (MOE) for MFLT. Magnetic camera uses the two dimensional Hall sensor arrays to imaging the LMFD. And the MOE project LMFD. The plane of polarized light rotates inside of magneto-optical film (MOF). The Faraday rotation angle proportional to direction and intensity of magnetic flux density. Sensitivity, spatial resolution, magnetic hysteresis, repeatability, full-scaled operational range compared. Also shape of target specimen compares too.

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Section: Signal Processingmentioning

confidence: 99%