Abstract
A highly-sensitive magneto-optical Faraday sensor was miniaturized, including Bi-substituted yttrium iron garnet (Bi: YIG) thin films. The magnetic field over the surface of the cracked steel was measured by using this sensor. The results demonstrated that this sensor could illustrate the micro-cracks on the surface and subsurface of the sample and was a proper candidate for Magnetic Flux Leakage method. In addition, the possibility of the crack and micro-crack detection was evaluated by utilizing a magneto-optical miniaturized sensor. The experimental setup encompassed miniaturized optical setup, Bi: YIG thin films, and some samples with different cracks and micro-cracks. The results of the present study revealed that the sensor can focus on the sample up to 1 μm and its output represented good sensitivity to the crack parameters. This technique can be proficient to high resolution and miniaturized magneto-optical sensor since it can find the cracks and micro-cracks on the sample surface for application in magnetic flux leakage test industry.
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