Design of Double-Layer Electrically Extremely Small-Size Displacement Sensor

Abstract

In this paper, a displacement sensor with an electrically extremely small size and high sensitivity is proposed based on an elaborately designed metamaterial element, i.e., coupled split-ring resonators (SRRs). The sensor consists of a feeding structure with a rectangular opening loop and a sensing structure with double-layer coupled SRRs. The movable double-layer structures can be used to measure the relative displacement. The size of microwave displacement sensors can be significantly reduced due to the compact feeding and sensing structures. By adjusting the position of the split gap within the resonator, the detection directions of the displacement sensing can be further expanded accordingly (along with the x- or y-axis) without increasing its physical size. Compared with previous works, the extremely compact size of 0.05λ0 × 0.05λ0 (λ0 denotes the free-space wavelength), a high sensitivity, and a high quality factor (Q-factor) can be achieved by the proposed sensor. From the perspective of the advantages above, the proposed sensor holds promise for being applied in many high-precision industrial measurement scenarios.

Microwave-sensor-node integrated into a short-range wireless sensor network

“…Table 2 includes the comparison of the results of our work with the experimental results obtained in Xue 31 , Horestani 32 , Rezaee 33 , Soltan 34 and Wang 35 , where a VNA was used as a measuring instrument. When comparing the sensitivity it can be said that the sensitivity shown with the data obtained with the WSN is high since in three of the five papers presented a lower sensitivity is reported.…”

“…Dielectric permittivity sensors are a type of sensors that relate dielectric permittivity in microwave frequencies to physical variables. Many dielectric permittivity sensors have been proposed worldwide for applications in non-invasive glucose detection 14 , milk quality monitoring 15 , humidity measurement 16 , liquid characterization 17 , chromatography 18 , meat quality 19 , food adulteration 20 , temperature measurement 21 , pH measurement 22 , gas detection 23 , diabetic foot ulcer detection 24 , breast cancer detection 25 , ultraviolet light detection 26 , salt and sugar measurement in water 27 , characterization of electrolytes in urine 28 , moisture in tissues measurement 29 , chemical reactions in gases 30 , measurement of small displacements 31 – 35 , etc.…”

Double-Layered metamaterial resonator operating at millimetre wave for detection of dengue virus

“…The optimised parameters for the sensor are given in Table 1. The circular opening loop in the bottom layer can work as a magnetic dipole, which produces an oscillating magnetic field perpendicular to the top substrate layer [16]. Two layers of the resonators under the magnetic field excitation will induce currents in a similar direction, eventually forming positive mutual inductance (M).…”

Deep-Learning-Assisted Simultaneous Target Sensing and Super-Resolution Imaging

“…Metasurfaces are constructed surfaces containing subwavelength atoms periodically or nonperiodically, whose inherent ability is to manipulate electromagnetic waves in subwavelength footsteps . Metasurfaces have attracted extensive attention in sensing and imaging systems, where scattering, diffraction, and other interactions can occur between the metasurfaces and targets. – On the one hand, sensing contains perceptions of the distance or thickness, , refractive indices, movements of organisms, , the composition of materials, and so on. For instance, by attaching the analyte to a Fano-resonances metasurface, its refractive index can be characterized by the shifts of the Fano-resonance peaks .…”