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Article Dans Une Revue IEEE Transactions on Microwave Theory and Techniques Année : 2017

Displacement Sensor Based on Radar Cross-Polarization Measurements

Résumé

This article presents the feasibility of measuring sub-millimeter displacements of objects in real environments using simple resonant radar targets. These scatterers, also known as chipless tags, have their own radar signature that can be used not only for identification but also for sensing. The chipless RFID is a highly promising technology since it paves the way for the development of easily implementable communication systems where tags have costs similar to barcodes. Object displacements are extracted by just evaluating at different times the variation of the signals backscattered in cross polarization from the tags. Based on this analog RFID sensing principle, an analytical model is developed to perform the direct derivation of the displacements. Therefore, the approach does not require complex and specific calibration procedures based on lookup table for compensating variations due to the presence of surrounding unknown objects. It is possible to add this functionality to already designed chipless RFID tag operating in cross-polarization without decreasing their coding capacity. Experimentations inside and outside anechoic chamber have been done, and very good agreement was obtained with simulations. It has been proved that sub-millimeter displacements can be monitored with this approach. Chipless tag displacement of 0.5 mm with less than ±45 µm error can be detected in real environment for a read range of up to 40 cm.
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Dates et versions

hal-02065457 , version 1 (01-07-2020)

Identifiants

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Etienne Perret. Displacement Sensor Based on Radar Cross-Polarization Measurements. IEEE Transactions on Microwave Theory and Techniques, 2017, 65 (3), pp.955-966. ⟨10.1109/TMTT.2016.2638842⟩. ⟨hal-02065457⟩

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