GARCÍA-OYA , José Ramón

Este trabajo de tesis propone la utilización sistemas basados en submuestreo como una alternativa para la implementación de la etapa de down-conversion de los receptores de radio frecuencia (RF) empleados para aplicaciones multi-estándar y SDR (Software Defined Radio). El objetivo principal será el de optimizar el diseño en cuanto a...

This paper presents a prototype of a system for intermodal freight transport with electronics management of goods. The system is based on low-power wireless networks connecting intelligent containers. The proposed intelligent container can be configured with different types of sensors inside. With the objective to preserve the sealing of the...

This article presents a design approach to the early detection of elevator-belt failures. The proposed system is based on the time-domain reflectometer (TDR) techniques with the objective to detect the presence and location of faults along the cables. The proposed detection circuit, which measures the cable impedance variations, presents the...

In this paper, a fully designed ultrasonic transit time-based gas flow sensor is presented. The proposed sensor has been optimized in terms of accuracy, sensitivity, and power consumption at different design stages: mechanical design of the sensor pipe, piezoelectric transducer configuration and validation over temperature, time of flight...

This paper presents a system with location functionalities for the inventory of traffic signs based on passive RFID technology. The proposed system simplifies the current video-based techniques, whose requirements regarding visibility are difficult to meet in some scenarios, such as dense urban areas. In addition, the system can be easily...

In this article, the design of an ultrasonic gas flow sensor with a low cost and low energy temperature compensation method based on time of flight (ToF) measurement is presented. In order to minimize the cost, the proposed thermal compensation method, on the one hand, does not require a temperature sensor and, on the other hand, only requires...

An enhanced ultrasonic communication system based on piezoelectric transducers for monitoring of goods in cargo containers is presented. The proposed system consists of several sensors placed inside the container, whose data are collected and transmitted outside it. Data transmission is carried out by an ultrasonic communication channel, in...

The rise of the Internet of Things (IoT) systems and the evolution of low-power wide-area networks have directly contributed to the emergence of a new generation of structural health monitoring (SHM) systems based on the nondestructive test (NDT) approach. Consequently, this article presents the design and development of a synchronous,...

A low-power ultrasonic communication front end conceived for cargo container monitoring is presented. Two piezoelectric transducers (PTs) operating at 40 kHz are fixed to the metallic wall by means of a customized magnetic case, allowing a noninvasive inside-outside communication preserving the container integrity. Once the resulting ultrasonic...