Detection of Metal Surface Cracks Based on Liquid Switch Controlled Spoof Surface Plasmon Polaritons

Microwave Dual-Crack Sensor with a High Q-Factor Using the TE20 Resonance of a Complementary Split-Ring Resonator on a Substrate-Integrated Waveguide

“…These approaches have received significant attention because multi-detection capability significantly reduces the scanning time over wide areas and reduces power consumption. In [ 44 ], a power divider was used to produce independent frequencies and increase the Q-factor, leading to the fabrication of a sensor with high accuracy for liquid material permittivity measurements. In [ 16 ], a substrate highly sensitive to temperature was used to combine temperature and crack sensing.…”

“…In [ 14 , 41 ], higher-mode antennas were introduced to produce independent frequencies and detect the tilting angle of metal cracks. In [ 44 ], a spoof surface plasmon polariton sensor was used for multiple crack detection by incorporating liquid channels. The sensor had high accuracy, sensing resolution, and sensitivity, but liquid switches have a slow switching speed and require an additional system for movement and storage.…”

“…As a result, it is difficult to simultaneously detect multiple cracks and produce a high Q-factor because multi-crack detection sensors that requires independently operating resonances have unique structures such as multiband filters or multiband antennas [ 30 , 31 , 32 , 33 , 34 ]. Sensors that can detect two materials simultaneously and independently have gained significant research attention because they can significantly increase the sensing accuracy and reduce the scanning time for large areas while reducing power consumption [ 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 ]. In this paper, we propose a novel method that can increase the number of cracks that can be detected and produce a high Q-factor by integrating complementary split-ring resonators (CSRRs) with a higher-mode substrate-integrated waveguide (SIW).…”

Conformal metal crack detection sensor based on flexible graphene film antenna

“…The optical fiber sensor is considered to be a very promising sensor, which has the advantages of high sensitivity and distributed arrangement but with prohibitive cost 8–11 . A spoof surface plasmon polaritons (SSPPs) sensor based on liquid switch control is proposed to detect metal surface cracks, the detection method is based on the change of reflection coefficient of SSPPs sensor caused by cracks 12 . However, the structure of this sensor is more complex, and the switch type should be used for control.…”

“…[8][9][10][11] A spoof surface plasmon polaritons (SSPPs) sensor based on liquid switch control is proposed to detect metal surface cracks, the detection method is based on the change of reflection coefficient of SSPPs sensor caused by cracks. 12 However, the structure of this sensor is more complex, and the switch type should be used for control. In the meantime, microstrip antenna sensors not only have the advantages of small size, lightweight, low profile, and easy conformal, 13,14 proposed crack detection based on microstrip antenna sensors and achieved a detection sensitivity of 22.1 MHz/ mm.…”