Juan D. González-Teruel

Juan D. González-Teruel
Universidad Politécnica de Cartagena | UPCT · Systems and Automatic Engineering

Master of Engineering

About

23
Publications
5,265
Reads
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100
Citations
Introduction
Juan Domingo González-Teruel currently works at the Dept. of Automatics, Electrical Engineering and Electronic Technology, Universidad Politécnica de Cartagena (SPAIN) and he is granted with a FPU contract. Juan D. González-Teruel current research is mainly focused on soil moisture sensors, soil modeling, dielectric measurements and Precision Agriculture instrumentation design and modeling.
Additional affiliations
February 2017 - present
Universidad Politécnica de Cartagena
Position
  • PhD Student
Description
  • My Master Degree Final Project and Thesis project are developed in the Systems and Automatic Engineering Department of the Technical University of Cartagena. The research is about developing low-cost soil moisture sensors
November 2014 - October 2015
Universidad Politécnica de Cartagena
Position
  • Student
Description
  • During a collaboration grant I was working in a project called "Improvement in the energy efficiency of air-cooled photovoltaic installations and evaporative cooling systems integrated in air-conditioning systems" with Drs. Sánchez Káiser and Viedma
Education
October 2015 - October 2017
Universidad Politécnica de Cartagena
Field of study
  • Industrial Engineering
September 2011 - October 2015
Universidad Politécnica de Cartagena
Field of study
  • Electrical Engineering

Publications

Publications (23)
Article
Full-text available
The number of sensors, ground-based and remote, exploiting the relationship between soil dielectric response and soil water content continues to grow. Empirical expressions for this relationship generally work well in coarse-textured soils but can break down for high-surface area and intricate materials such as clayey soils. Dielectric mixing model...
Article
Full-text available
Water is a limited resource in arid and semi-arid regions, as is the case in the Mediterranean Basin, where demographic and climatic conditions make it ideal for growing fruits and vegetables, but a greater volume of water is required. Deficit irrigation strategies have proven to be successful in optimizing available water without pernicious impact...
Conference Paper
Full-text available
Soil moisture is of major relevance in agricultural and environmental monitoring, having a direct impact in crop growth and yield, and playing an important role in soil conservation and landscape management. Several well-known techniques are widely used to determine soil moisture, but dielectric methods are notable for their automation potential an...
Article
Full-text available
The performance of a handheld Vector Network Analyzer (VNA), the nanoVNA, a low-cost, open-source instrument, was evaluated. The instrument measures the complex permittivity of dielectric media from 1-port reflection parameters in the 1 – 900 MHz bandwidth. We manufactured an open-ended coaxial probe using a SMA-N coaxial adapter to perform dielect...
Article
Full-text available
Crop canopy temperature measurement is necessary for monitoring water stress indicators such as the Crop Water Stress Index (CWSI). Water stress indicators are very useful for irrigation strategies management in the precision agriculture context. For this purpose, one of the techniques used is thermography, which allows remote temperature measureme...
Conference Paper
Full-text available
Sensor platforms are used as sources of information for certain specific environments. In the field of maritime and oceanographic systems, these platforms make it possible to sensorize certain properties of the water based on various variables, such as the oxygen level, the levels of turbidity, chlorophyll, salinity, etc. Due to the different strat...
Chapter
Full-text available
El agua es un bien escaso, especialmente en las regiones áridas y semiáridas. Este es el caso de la Cuenca Mediterránea, donde sus condiciones demográficas y climáticas la hacen idónea para el cultivo de frutas y hortalizas, demandando un volumen mayor de recursos hídricos. Las estrategias de riego deficitario se han mostrado exitosas, pero resulta...
Article
Time domain reflectometry (TDR) is the most widely used non-destructive method to determine the water content of soils and other porous media. TDR equipment can be automated and multiplexed to acquire accurate and rapid waveforms (return signal) without safety concerns associated with radioactive methods (e.g., neutron probe and Gamma-ray probe). T...
Conference Paper
Full-text available
La optimización del riego es crucial en agricultura. Una de las técnicas empleadas habitualmente en las regiones áridas es el riego deficitario, que requiere la medición de los parámetros de estrés de los cultivos. El Índice de Estrés Hídrico del Cultivo (CWSI) es uno de estos parámetros y se obtiene a partir de la temperatura del dosel vegetal. Si...
Article
Full-text available
The crop water stress index (CWSI) is one of the parameters measured in deficit irrigation and it is obtained from crop canopy temperature. However, image segmentation is required for non-leaf region exclusion in temperature measurement, as it is critical to obtain the temperature values for the calculation of the CWSI. To this end, two image-segme...
Poster
Full-text available
Numerous dielectric soil moisture sensors are now commercially available and new designs are continuously released. However, the dependence of the permittivity-water content relationship on soil and porous media properties, remains poorly understood with regard to the frequency domain response. Since Topp et al.’s seminal paper1, several studies ha...
Article
Full-text available
Water is the main limiting factor in agricultural production as well as a scarce resource that needs to be optimized. The measurement of soil water with sensors is an efficient way for optimal irrigation management. However, commercial sensors are still too expensive for most farmers. This paper presents the design, development and calibration of a...
Conference Paper
Water is the main limiting factor in agricultural production as well as a scarce resource that needs to be optimized. The measurement of soil water with sensors is an efficient way for optimal irrigation management. However, several sensors are necessary to ensure reliable measurements in a medium with as much dispersion as the ground. The design o...
Conference Paper
Full-text available
La creciente aplicación de la tecnología al control de los cultivos ha llevado al desarrollo de múltiples sistemas de medida del contenido de agua del suelo, permitiendo, de este modo, un uso eficiente de un bien tan escaso como es el agua. Sin embargo, el coste de estos equipos es elevado, lo que dificulta su uso masivo en el sector. Por este moti...
Conference Paper
Full-text available
La determinación de la evapotranspiración del cultivo (ETc) es un tema de gran importancia en la gestión del regadío. Numerosos autores han propuesto coeficientes y técnicas para la obtención de la ETc. Desde el punto de vista práctico, la ETc es directamente medible con técnicas de lisimetría, pero dada la gran complejidad y la poca escalabilidad...
Conference Paper
Moisture control has become an important fact for the last years. It has influence on human health and comfort, as well as the quality of certain services and processes. Therefore, it plays an important role for many industries, storage systems, transport and the preservation of products. For this reason, air-conditioning systems are integrating a...

Questions

Question (1)
Question
I have the Cole-Cole parameters from F. Buckley and A. A. Maryott, Circular of the Bureau of Standards no 589: tables of dielectric dispersion data for pure liquids and dilute solutions. National Bureau of Standards, 1958, that in turn come from MIT, Tables of Dielectric Materials, vol. Ill, Tech. Rept. No. X (June 1948), vol. IV, Tech. Rept. No. 57 (January 1953), Laboratory Insulation Research, Massachusetts Institute of Technology. However, I expected to find some renovated data based on new measurements performed with updated technology.
Sengwa, R. J., Kaur, K., & Chaudhary, R. (2000). Dielectric properties of low molecular weight poly(ethylene glycol)s. Polymer International, 49(6), 599–608 reports these data, but only from 200MHz.
Does anyone know a reliable source for lower frequencies?

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Projects

Projects (2)
Project
This project aims to contribute to the necessary improvement of water management in woody crops of great interest to Spain and countries of the Mediterranean basin, such as almond tree under traditional farming system and high crop density and pomegranate, a crop in expansion and very well adapted to limiting conditions of water and its quality. The subproject is based on the need to have a precise knowledge of the response of the crop to water deficit, both physiological and agronomic, to develop criteria and strategies for scientific programming of Controlled Deficit Irrigation (RDC) and that, for its precise implementation, need equipment and tools that are easily accessible to the agricultural sector, such as low-cost sensors and models of automatic programming of irrigation. Through the objectives set, the aim is to study in depth the water relations in the soil-plant-atmosphere continuum by using new modelling techniques with the acquisition and statistical and mathematical treatment of more complete and transversal databases, where the surface temperature of the canopy and multispectral images play an important role. To facilitate this objective, the subproject contemplates as parallel objectives: i) the improvement of self-designed multiparametric sensors, ii) the assembly of a platform for research on plant indicators, that can be used for the automatic and controlled obtaining of a large number of thermal and multispectral images, iii) the integration of measurement nodes in wireless sensor network systems and iv) the design and training of a decision-making aid model (DSS), trained with indicators of the water status of the soil and plant for the automatic programming of irrigation. The marked final objective of this subproject aims to combine the advantages of the use of deficit irrigation strategies controlled in fruit crops of pomegranate and almond trees, in areas with low water availability, with the use of new technologies in the field of modeling and ICTs. The great sensitivity developed by farmers and entrepreneurs in semi-arid areas for the optimal use of water has generated an open mind to try and adopt new forms of management and acquisition of technologies that can result in a more efficient use of available water resources.
Project
The main objective of this subproject is to contribute to the improvement of agricultural water management in woody crops located at the Mediterranean basin. Carrying out an optimal water resources management requires to accurately know the crop response to water deficit at both physiological and agronomic levels. The Regullated Deficit Irrigation is a complex method since many factors, related to the Soil-Plant-Atmosphere continuum and its high variability should be taking into account. This is the reason for which reliable measurement systems that continuously measure plant and soil water status, on real time, should be developed and deployed, before automating the irrigation procedure. Even though there are many commercial sensors able to measure certain parameters that provide information about the soil water potential or the plant water status, and it would be ideal to use such information as support for decision making and irrigation automation, they are barely deployed in real crops, since their economical cost is high, signal management is difficult and properly defining thresholds is also rather hard. Because of this, the proposed project is focused on developing a technique that allows a suitable implementation of the RDI by considering three major issues: a) The need of designing appropriate sensors, measurement techniques and interfaces capable of measuring parameters that represent the amount of water in soil in a clear, easy-to-understand and more direct manner. Such sensors should be easy to install and they should deliver reliable measurements providing enough variability. b) The need of determining better indexes and signs to estimate the water stress in the studied crops, such as the CWSI that allows the information about top tree and air temperature to be acquired. Data acquisition and term-radiometry equipment installation should be made as easy as possible, by taking autonomous systems based on Wireless Sensor Networks (WSNs). c) The need of adopting DSS-Decision Support Systems that allow stakeholders to define the required parameters for reliably programming the RDI. Thus, techniques for managing big data volumes obtained from the Soil-Plant-Atmosphere continuum, and autolearning methods to adapt the variability of the received information, should be also considered and properly developed.