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Compact readout system for chipless passive LC tags and its application for humidity monitoring
dc.contributor.author | Escobedo Araque, Pablo | |
dc.contributor.author | Martínez Olmos, Antonio | |
dc.contributor.author | Fernández-Salmerón, José | |
dc.contributor.author | Rivadeneyra Torres, Almudena | |
dc.contributor.author | Capitán Vallvey, Luis Fermín | |
dc.contributor.author | Palma López, Alberto José | |
dc.contributor.author | Carvajal Rodríguez, Miguel Ángel | |
dc.date.accessioned | 2023-01-16T10:48:47Z | |
dc.date.available | 2023-01-16T10:48:47Z | |
dc.date.issued | 2018-09-01 | |
dc.identifier.uri | https://hdl.handle.net/10481/79017 | |
dc.description.abstract | The development of a contactless readout system for High Frequency (HF) tags and its application to relative humidity monitoring is presented. The system consists of a Colpitts oscillator circuit whose frequency response is determined by a built-in logic counter of a microcontroller unit. The novel readout strategy is based on the frequency response change due to the inductive coupling between the coil of the Colpitts oscillator and the load impedance of a parallel LC resonator tag, as a result of the variation of the humidity sensing capacitor. The frequency is monitored with a low cost microcontroller, resulting in a simple readout circuit. This passive LC tag has been directly screen-printed on a humidity-sensitive flexible substrate. The readout circuit experimental uncertainty as frequency meter was 4 kHz in the HF band. A linear temperature drift of (-1.52 ± 0.17) kHz/⁰C was obtained, which can be used to apply thermal compensation if required. The readout system has been validated as a proof of concept for humidity measurement, obtaining a significant change of about 260 kHz in the resonance frequency of the Colpitts oscillator when relative humidity varies from 10% to 90%, with a maximum uncertainty of ±3% (±2 SD). Therefore, the proposed readout system stands as a compact, low-cost, contactless solution for chipless HF tags that avoids the use of bulky and costly equipment for the analog reading of wireless passive LC sensors. | es_ES |
dc.description.sponsorship | This work was supported by project CTQ2016-78754-C2-1-R from the Spanish Ministry of Economics and Competitivity. P. Escobedo wants to thank the Spanish Ministry of Education, Culture and Sport (MECD) for a pre-doctoral grant (FPU13/05032). | es_ES |
dc.rights | Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License | en_EN |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/3.0/ | en_EN |
dc.title | Compact readout system for chipless passive LC tags and its application for humidity monitoring | es_ES |
dc.type | info:eu-repo/semantics/article | es_ES |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | es_ES |
dc.identifier.doi | 10.1016/j.sna.2018.07.040 |