Results 21 to 30 of about 35,150 (277)

Calculation of soil water content using dielectric-permittivity-based sensors – benefits of soil-specific calibration [PDF]

Geoscientific Instrumentation, Methods and Data Systems, 2023
Soil water content (SWC) sensors are widely used for scientific studies or for the management of agricultural practices. The most common sensing techniques provide an estimate of volumetric soil water content based on sensing of dielectric permittivity ...
B. M. Zawilski, F. Granouillac, N. Claverie, B. Lemaire, A. Brut, T. Tallec   +5 more
doaj   +1 more source

Research on a high-sensitivity asymmetric metamaterial structure and its application as microwave sensor

Scientific Reports, 2022
In this paper, an Asymmetric Electric Split-Ring Resonator (AESRR) metamaterial structure is proposed to explore the interaction between metamaterials and electromagnetic waves with the influence of Fano resonance on electromagnetic properties.
Yunhao Cao, Cunjun Ruan, Kanglong Chen, Xingyun Zhang   +3 more
doaj   +1 more source

Low-Cost Electronics for Automatic Classification and Permittivity Estimation of Glycerin Solutions Using a Dielectric Resonator Sensor and Machine Learning Techniques

Sensors, 2023
Glycerin is a versatile organic molecule widely used in the pharmaceutical, food, and cosmetic industries, but it also has a central role in biodiesel refining.
Miguel Monteagudo Honrubia, Javier Matanza Domingo, Francisco Javier Herraiz-Martínez, Romano Giannetti   +3 more
doaj   +1 more source

On the sensitivity of generic porous optical sensors [PDF]

, 2012
A porous material was considered as a platform for optical sensing. It was envisaged that the porous material was infiltrated by a fluid which contains an agent to be sensed.
Abdulhalim, Alù, Bremer, Choi, Cook, De Stefano, Devender, Homola, Lakhtakia, Lakhtakia, Lakhtakia, Lakhtakia, Lovat, Mackay, Mackay, Mackay, Mackay, Mackay, Mackay, Mackay, Menzel, Messier, Michel, Michel, Michel, Navarro-Cía, Pinet, Polo, Polo, PoloMahalik, Pursel, Saarinen, Scarano, Schiebener, Shin, Simovski, Ward, Weiglhofer, Weiglhofer   +38 more
core   +2 more sources

Highly Sensitive Quartz-Based Sensing System for the Detection of Subpercentage Changes in the Relative Permittivity of Liquids Flowing in Microchannels

Chemosensors, 2021
We describe a highly sensitive quartz sensor for measuring changes in the relative permittivity of liquids flowing in microchannels. The proposed method uses a highly stable oscillator and capacitance-dependent quartz crystal together with a capacitance ...
Vojko Matko, Miro Milanovič
doaj   +1 more source

In Field Application of an Innovative Sensor for Monitoring Road and Runway Surfaces [PDF]

, 2009
Water and ice detection over road and runway surfaces is important to improve traffic safety and to reduce maintenance costs. An innovative low cost capacitive sensor was endowed with an algorithm based on the time derivative of the measured capacitance ...
Mesin, Luca, Pasero, Eros Gian Alessandro, Troiano, Amedeo   +2 more
core   +1 more source

A computational model for path loss in wireless sensor networks in orchard environments. [PDF]

, 2014
A computational model for radio wave propagation through tree orchards is presented. Trees are modeled as collections of branches, geometrically approximated by cylinders, whose dimensions are determined on the basis of measurements in a cherry orchard ...
Anastassiu, Hristos T, Fronimos, Theodoros, Käthner, Jana, Petrou, Loukas, Regen, Christian, Vougioukas, Stavros, Zude, Manuela   +6 more
core   +3 more sources

An Inkjet Printed Chipless RFID Sensor for Wireless Humidity Monitoring [PDF]

, 2017
A novel chipless RFID humidity sensor based on a finite Artificial Impedance Surface (AIS) is presented. The unit cell of the AIS is composed of three concentric loops thus obtaining three deep and high Q nulls in the electromagnetic response of the tag.
Borgese, Michele, Costa, Filippo, Dicandia, Francesco Alessio, Genovesi, Simone, Manara, Giuliano   +4 more
core   +2 more sources

Complementary Metamaterial Sensor for Nondestructive Evaluation of Dielectric Substrates

Sensors, 2019
In this paper, complementary metamaterial sensor is designed for nondestructive evaluation of dielectric substrates. The design concept is based on electromagnetic stored energy in the complementary circular spiral resonator (CCSR), which is concentrated
Tanveer ul Haq, Cunjun Ruan, Xingyun Zhang, Shahid Ullah   +3 more
doaj   +1 more source

CSRR-Based Microwave Sensor for Dielectric Materials Characterization Applied to Soil Water Content Determination

Sensors, 2020
A new and compact sensor based on the complementary split-ring resonator (CSRR) structure is proposed to characterize the relative permittivity of various dielectric materials, enabling the determination of soil water content (SWC).
João G. D. Oliveira, Erica N. M. G. Pinto, Valdemir P. Silva Neto, Adaildo G. D’Assunção   +3 more
doaj   +1 more source