A contactless measurement of the surface impedance of a thin sheet of material

Rodini, Sandra; Genovesi, Simone; Manara, Giuliano; Costa, Filippo

doi:10.23919/ursigass51995.2021.9560562

Cited by 5 publications

(2 citation statements)

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“…This allows obtaining the trend of the surface resistance of the material as the strain level varies and represents the calibration curve for a strain sensor. A preliminary investigation of a contactless approach was presented in [20][21][22]. In order to obtain an accurate measurement of the surface impedance, an EBG surface is positioned on one of the two flanges, which prevents field leakage in correspondence with the gap.…”

Section: Introductionmentioning

confidence: 99%

“…Here, a method is proposed that allows improving the estimation and limiting the error on the imaginary part. Unlike what was carried out in [20,21], in which a calibration measurement was created without the sample, here, it is proposed to perform the calibration with the sheet, whose surface impedance measurement has been previously obtained in a closed setup. What is evaluated with the proposed method is therefore not an absolute measure of the surface impedance; the variation in the surface impedance is evaluated as a function of the applied strain, which is the needed information to derive the strain/surface impedance calibration curve.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Contactless Waveguide Characterization of Piezoresistive Materials for Wireless Strain Sensors

Rodini

Genovesi

Manara

et al. 2022

Sensors

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Stretchable materials are widely used for the realization of various sensors, but their radio frequency behavior has not been fully characterized so far. Here, an innovative method is proposed for deriving the surface impedance of this kind of materials. The material characterization represents a fundamental step for exploiting the material as a sensing element within a radio frequency device. Indeed, the proposed method is capable of retrieving the surface impedance of the material while it is being stretched, thus deriving a correspondent calibration curve. The characterization approach is based on a contactless measurement of the scattering parameters using waveguides. By exploiting the measured scattering parameters, the variation in the surface impedance as a function of both frequency and strain is recovered through an analytical inversion procedure. Numerical simulations were initially performed trough a numerical electromagnetic simulator, and subsequently, experimental validation was carried out using a dedicated test bench designed to ensure a contactless measurement of the stretchable material.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%