Abstract
Based on localized spoof surface plasmons (LSSPs), a new microwave nondestructive testing (NDT) sensor is proposed to measure the thickness of magnetic absorbing coating on metallic surface. The metallic spiral structure (MSS) sensor fed by microstrip ring generates the LSSPs, which is used to interact with material under test (MUT) and measure the thickness of MUT. Through measurement mechanism and numerical analysis, the magnitude of the reflection coefficient is sensitive to the thickness variation of the coating. Taking a kind of magnetic absorbing film A4000 as an example, the experimental results reveal that the MSS sensor can estimate the film thickness with a range of 0.05-1.03mm, and the error is within 6%. The highest resolution can reach 0.05mm in the experiment. In fact, the formula shows that the highest resolution can reach 0.01mm. Compared with conventional monopole antenna, the microstrip ring is a new way to feed the MSS, which makes the sensor structure more stable and more compact. The sensitivity of the sensor is improved by using electric field and magnetic field to interact with the MUT together. The sensor has the advantages of high resolution, small error, stable performance and no limit to the size of the MUT.
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