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Development of Surface Crack Sensors using Fractal Geometries of Complementary Split Ring Resonators

This paper introduces novel microwaves-based designs of surface crack sensor topologies with high sensitivity. The proposed sensors are developed based on fractal geometries of complementary split ring resonators (CSRR). The design has attractive features for practical implementation including design simplicity, flexible design parameters and a wide dynamic range of the sensing-related frequency. These features allow the user to easily customize the sensor design to meet specific inspection procedure requirements (i.e. to precisely detect relevant indications and bypass irrelevant ones). The sensor performance has been verified using the full-wave numerical simulation package ANSYS HFSS. A proof-of- concept resonance frequency shift of 620 MHz was obtained for a surface crack having 100-um width and 2mm depth. Topology of the proposed crack sensors achieved more than 25% sensitivity enhancement compared to recently developed CSRR surface crack sensor. This topology was able to detect a 10-um width surface crack with 230 MHz shift in the resonance frequency.


(1) C.-Y. Yeh and R. Zoughi, "A novel microwave method for detection of long surface cracks in metals" IEEE Trans. Instrum. Meas., vol. 43, no. 5, pp. 719–725, Oct. 1994.

(2) R. Zoughi, S. Ganchev, and C. Huber, "Measurement Parameters Optimization for Surface Crack Detection in Metals using an Open-Ended Waveguide Probe" in Proc. IEEE Instrum. Meas. Technol. Conf., Jun.1996, pp. 1391– 1394.

(3) R. Zoughi and S. Khrkovsky, "Microwave and millimetre wave sensors for crack detection” Fatigue Frac. Eng. Materials Struct., vol. 31, pp. 695–713, 2008.

(4) Albishi, A. M., Boybay, M. S., & Ramahi, O. M. (2012). "Complementary split-ring resonator for crack detection in metallic surfaces". IEEE Microwave and Wireless Components Letters, 22(6), 330-332.

(5) Hu, B., Ren, Z., Boybay, M. S., & Ramahi, O. M. (2014). "Waveguide probe loaded with split-ring resonators for crack detection in metallic surfaces". IEEE Transactions on Microwave Theory and Techniques, 62(4), 871-878.

(6) Albishi, Ali, and Omar M. Ramahi. "Detection of surface and subsurface cracks in metallic and non-metallic materials using a complementary split-ring resonator." Sensors 14.10 (2014): 19354-19370.

(7) Albishi, Ali M., and Omar M. Ramahi. "Surface crack detection in metallic materials using sensitive microwave- based sensors." Wireless and Microwave Technology Conference (WAMICON), 2016 IEEE 17th Annual. IEEE, 2016.

(8) Albishi, Ali M., and Omar M. Ramahi. "Microwaves-Based High Sensitivity Sensors for Crack Detection in Metallic Materials." IEEE Transactions on Microwave Theory and Techniques 65.5 (2017): 1864-1872.

(9) Caloz, Christophe, and Tatsuo Itoh. Electromagnetic metamaterials: transmission line theory and microwave applications. John Wiley & Sons, 2005.

(10) Cubukcu, Ertugrul, et al. "Subwavelength resolution in a two-dimensional photonic-crystal-based superlens." Physical review letters 91.20 (2003): 207401.

(11) Iyer, Ashwin K., and George V. Eleftheriades. "Free-space imaging beyond the diffraction limit using a Veselago-Pendry transmission-line metamaterial superlens." IEEE transactions on antennas and propagation 57.6 (2009): 1720- 1727.

(12) Husain, A., and E. A. Ash. "Microwave scanning microscopy for non-destructive testing." Microwave Conference, 1975. 5th European. IEEE, 1975.

(13) Tabib-Azar, Massood, Neil S. Shoemaker, and Stephen Harris. "Non-destructive characterization of materials by evanescent microwaves." Measurement Science and Technology 4.5 (1993): 583.

(14) Tabib-Azar, M., et al. "Nondestructive superresolution imaging of defects and nonuniformities in metals, semiconductors, dielectrics, composites, and plants using evanescent microwaves." Review of Scientific Instruments 70.6 (1999): 2783-2792.

(15) Durán-Sindreu, M., Naqui, J., Paredes, F., Bonache, J., & Martín, F. (2012). Electrically small resonators for planar metamaterial, microwave circuit and antenna design: A comparative analysis. Applied Sciences, 2(2), 375-395.

(16) Crnojevic-Bengin, Vesna, Vasa Radonic, and Branka Jokanovic. "Fractal geometries of complementary split- ring resonators." IEEE Transactions on Microwave Theory and Techniques 56.10 (2008): 2312-2321.

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