Remote detection of surface cracks/slots on metal structures is desirable in many industries. This becomes especially important in the light of fast detection over large surface areas. Open-ended rectangular waveguides are suitable for such surface inspection. The potential of open-ended rectangular waveguide sensors for surface crack/slot detection has been demonstrated in previous work. However, an increase in the detection sensitivity for remote detection is desired. Various measureemtn parameters for optimization have to be considered, which include various criteria for an optimal standoff distance, a certain range of the incidence angle of the sensor with which the electromagnetic field is transmitted and received, and polarization of the incident field. Though the development of an electromagnetic model will be necessary, preliminary results and discussions of the influence of these parameters on the measurements are presented in this paper.
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