We investigated the feasibility of using magneto-optical sensors for measuring the magnetic leakage
fields in non-destructive evaluation. We used magneto-optical garnet thin films as a sensor and the effect
of crack dimension on the sensor’s response were investigated via a simple Faraday rotation technique.
Our results show that the sensor signal displays a linear increase as the length and depth of the cracks
increase however; the change in crack width does not have a significant effect on the magnetic leakage
field and the sensor’s signal. This technique is capable of high resolution magnetic imaging of small
surface cracks and thus has great potential for application in the magnetic flux leakage test industry.
کلید واژگان :
Magneto-optical sensors Garnet thin films Faraday rottaion Magnetic flux leakage
