Search results for "campi elettromagnetici"

showing 10 items of 155 documents

Sub-Millimeter Displacement Sensing by Passive UHF RFID Antennas

2014

A slotted patch is transformed into a wireless passive UHF-RFID sensor of uni-dimensional displacements by introducing a mechanic-electromagnetic modulation capable to convert sub-millimeter deformations into changes of the antenna's response, remotely detectable. A design methodology allows to obtain the desired sensitivity and dynamic range in a fully controllable way. The sensor and the methodology are discussed through the help of preliminary laboratory experimentations on a concrete brick, showing the possibility to achieve resolutions better than 0.1 mm with low cost readers.

Directional antennaComputer sciencebusiness.industryElectrical engineeringSettore ING-INF/02 - Campi ElettromagneticiMicrostrip antennaUltra high frequencyModulationElectronic engineeringWirelessSensitivity (control systems)Electrical and Electronic EngineeringAntenna (radio)businessRFID sensor Antenna
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Electro-optical characterization of ruthenium-based dye sensitized solar cells: A study of light soaking, ageing and temperature effects

2017

Abstract In this work, we report on the electro-optical characterization of Dye Sensitized Solar Cells (DSSCs) which use ruthenium complexes as sensitizers. In particular, several kinds of measurements have been performed to study the electrical performances and the efficiency levels of the cells at different operating conditions. In detail, the measurements have been conducted at varying temperatures and hours of light soaking. Our results show that the short circuit current density J SC , the open circuit voltage V OC and the conversion efficiency η increase with the hours of light soaking, while they decrease with temperature. A thorough investigation on the light soaking process at the …

Dye sensitized solar cells (DSSCs)FabricationMaterials sciencechemistry.chemical_element02 engineering and technology010402 general chemistry01 natural sciencesSettore ING-INF/01 - ElettronicaPhotovoltaicsElectrical and Electronic Engineeringbusiness.industryOpen-circuit voltageEnergy conversion efficiencySettore ING-INF/02 - Campi ElettromagneticiLight soaking021001 nanoscience & nanotechnologyElectro-optical characterizationsAtomic and Molecular Physics and Optics0104 chemical sciencesElectronic Optical and Magnetic MaterialsRutheniumCharacterization (materials science)Dye-sensitized solar cellchemistryOptoelectronics0210 nano-technologybusinessShort circuitPhotovoltaic
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Modelling of wideband THz sources and detectors based on Optical Rectification and Electro-Optic Sampling

2012

Electro-Optic SamplingOptical rectificationSettore ING-INF/02 - Campi ElettromagneticiTerahertz rangeSettore ING-INF/01 - Elettronica
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5th EOS Topical Meeting on Optical Microsystems, Poster OμS13_1569798553: Analytical Model for wideband THz sources and detectors based on Optical Re…

2013

Electro-optic samplingTerahertz detectorsOptical rectificationTerahertz radiationTerahertz sourceSettore ING-INF/02 - Campi ElettromagneticiSettore ING-INF/01 - Elettronica
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Analytical Model for wideband THz sources and detectors based on Optical Rectification and Electro-Optic Sampling

2013

An analytical model describing a laser based set-up for wideband THz generation and detection is presented. Particular attention is focused on the main broadband phenomena, which occur when THz radiations have to be handled.

Electro-optic samplingTerahertz sources Terahertz detectorsOptical rectificationTerahertz radiationSettore ING-INF/02 - Campi ElettromagneticiSettore ING-INF/01 - Elettronica
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Design of a portable (CW) fNIRS embedded system

2014

Embedded SystemSettore ING-INF/02 - Campi ElettromagneticiSilicon photomultiplierSettore ING-INF/01 - ElettronicaFunctional near infrared spectroscopySensor
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Recovery Capabilities of Rateless Codes on Simulated Turbulent Terrestrial Free Space Optics Channel Model

2013

Free Space Optics (FSO) links are affected by several impairments: optical turbulence, scattering, absorption, and pointing. In particular, atmospheric optical turbulence generates optical power fluctuations at the receiver that can degrade communications with fading events, especially in high data rate links. Innovative solutions require an improvement of FSO link performances, together with testing models and appropriate channel codes. In this paper, we describe a high-resolution time-correlated channel model able to predict random temporal fluctuations of optical signal irradiance caused by optical turbulence. Concerning the same channel, we also report simulation results on the error mi…

EngineeringArticle SubjectIrradianceOptical powerSettore ING-INF/01 - ElettronicaSignaloptical turbulenceElectronic engineeringFadingElectrical and Electronic Engineeringtime-serieComputer Science::Information TheorySettore ING-INF/03 - TelecomunicazioniTurbulenceScatteringbusiness.industryRateless codesSettore ING-INF/02 - Campi Elettromagneticilcsh:HE9713-9715Free Space Opticlcsh:Cellular telephone services industry. Wireless telephone industrylcsh:Electrical engineering. Electronics. Nuclear engineeringbusinesslcsh:TK1-9971Communication channelFree-space optical communicationInternational Journal of Antennas and Propagation
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CIGS PV Module Characteristic Curves Under Chemical Composition and Thickness Variations

2014

This paper analyzes how the electrical characteristics of a CIGS photovoltaic module are affected by the chemical composition and by the thickness variations of the CIGS absorber. The electrical characteristics here considered are the short circuit current, the open circuit voltage, the efficiency and the power peak. The chemical composition is varied by tuning the ratio between gallium and indium. This analysis has been performed by means of the wxAMPS software, developed by the University of Illinois. The above variations have been taken into account on a PV module made of 72 cells. This analysis has been carried out employing a PV module mathematical model developed and implemented by th…

EngineeringOpen-circuit voltagebusiness.industryPhotovoltaic systemchemistry.chemical_elementSettore ING-INF/02 - Campi ElettromagneticiSettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciCopper indium gallium selenide solar cellsPhotovoltaic Modules characterizationSettore ING-INF/01 - ElettronicaPower (physics)CIGS Photovoltaic ModulechemistryElectronic engineeringOptoelectronicsGalliumbusinessMATLABShort circuitcomputerSettore ING-INF/07 - Misure Elettriche E ElettronicheIndiumcomputer.programming_language
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Experimental characterization of bodycentric passive RFID systems

2011

Recent progresses in the design of wearable RFID tag antennas stimulate the idea of passive bodycentric systems wherein the required power to drive the wearable tags is directly scavenged from the interrogation signal emitted by the reader unit. While active bodycentric links have been extensively investigated, the feasibility of passive systems is still questionable due to the poor sensitivity of the tags and to the modest read distances. This paper describes an articulated measurement campaign with textile wearable low-profile tags in the UHF RFID band. It is demonstrated that both on-body and off-body links are feasible with a power budget fully compliant with the available technology. T…

EngineeringPassive systemsbusiness.industryRFID sensor wearableeWearable computerSettore ING-INF/02 - Campi ElettromagneticiSignalPower budgetPower (physics)Ultra high frequencyElectronic engineeringSensitivity (control systems)businessInterrogation
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Feasibility of Body-centric Systems by Using passive textile RFID tags

2012

Recent progresses in the design of wearable RFID-tag antennas stimulate the idea of passive body-centric systems, wherein the required power to drive the wearable tags is directly scavenged from the interrogation signal emitted by the reader unit. While active body-centric links have been extensively investigated, the feasibility of passive systems is still questionable, due to the poor sensitivity of the tags and due to the modest reading distances. This paper describes a systematic measurement campaign involving low-profile wearable textile tags in the UHF RFID band. It was demonstrated that both on-body and off-body links are affordable, with a power budget fully compliant with the avail…

Engineeringbusiness.industryReading (computer)SIGNAL (programming language)Wearable computerSettore ING-INF/02 - Campi ElettromagneticiRFID wearable antennasSafety standardsCondensed Matter PhysicsPower budgetUltra high frequencyEmbedded systemSensitivity (control systems)Electrical and Electronic EngineeringbusinessInterrogation
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