Electronic Resource
Recent Development of Alternating Current Field Measurement Combine with New Technology
              Alternating current field measurement (ACFM) technology has been used 
for sizing underwater structure cracks. However, conventional ACFM is more sensitive to cracks perpendicular to the induced current than cracks with other angles. In 
this paper, a rotating alternating current field measurement (RACFM) method and 
underwater test system are present for the detection of arbitrary-angle cracks with 
high sensitivity. The RACFM is proved by simulations and experiments. Arbitraryangle cracks detection results obtained from ACFM and RACFM have shown that 
the RACFM method overcomes the limitation of directional detection of ACFM 
and effectively achieves high detection sensitivity for arbitrary-angle cracks on 
underwater structures.            
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