Low-Cost Online Monitoring System for the Etching Process in Fiber Optic Sensors by Computer Vision.

The present research exposes a novel methodology to manufacture fiber optic sensors following the etching process by Hydrofluoric Acid deposition through a real-time monitoring diameter measurement by computer vision. This is based on virtual instrumentation developed with the National Instruments® technology and a conventional digital microscope. Here, the system has been tested proving its feasibility by the SMS structure diameter reduction from its original diameter of 125 µ until approximately 42.5 µm. The results obtained have allowed us to demonstrate a stable state behavior of the developed system during the etching process through diameter measurement at three different structure sections. Therefore, this proposal will contribute to the etched fiber optic sensor development that requires reaching an enhanced sensitivity. Finally, to demonstrate the previously mentioned SMS without chemical corrosion, and the etched manufactured SMS, both have been applied as glucose concentration sensors.

Design, Development and Testing of a Monitoring System for the Study of Proton Exchange Fuel Cells and Stacks.

This article is about the design, development and validation of a new monitoring architecture for individual cells and stacks to facilitate the study of proton exchange fuel cells. The system consists of four main elements: input signals, signal processing boards, analogue-to-digital converters (ADCs) and a master terminal unit (MTU). The latter integrates a high-level graphic user interface (GUI) software developed by National Instruments LABVIEW, while the ADCs are based on three digital acquisition units (DAQs). Graphs showing the temperature, currents and voltages in individual cells as well as stacks are integrated for ease of reference. The system validation was carried out both in static and dynamic modes of operation using a Ballard Nexa 1.2 kW fuel cell fed by a hydrogen cylinder, with a Prodigit 32612 electronic load at the output. The system was able to measure the voltage distributions of individual cells, and temperatures at different equidistant points of the stack both with and without an external load, validating its use as an indispensable tool for the study and characterization of these systems.

Construcción de un prototipo de monitoreo de señales cardíacas aplicando tecnología inalámbrica zigbee e internet

En este trabajo se presenta el desarrollo de un sistema que permite monitorear la actividad cardíaca a personas que necesitan observación continua. Dichos registros son observables con mínimo retardo respecto al momento en que suceden, siendo almacenados y enviados por medio de una conexión a internet al implementar la tecnología inalámbrica Zigbee. Se hizo uso del software Labview para procesar los datos a partir de la señal electrocardiográfica y se desarrolló una interfaz gráfica para visualizar las señales adquiridas. Luego del proceso de adquisición, aislamiento, filtrado análogo en el dispositivo portátil, transmisión inalámbrica y recepción por parte de un PC, se realiza el filtrado digital a la señal cardiaca adquirida para obtener la señal ECG filtrada en el PC local.

This work introduces the development of a system that allows to monitor cardiac activity in people who need this continually. Those records register a minimun rate of delay in terms of the moment they happen, and they are sent through the internet by using the wireless technology Zigbee. Labview software was used to process data from the electrocardiographic signal, and we developed a graphic interface to visualize the signals. After acquisition, isolation, analog filtering of the portable device, Wireless transmission and reception in a PC, we carried out a digital filtering for the cardiac signal to obtain a filtered ECG signal in the PC.

Neste trabalho, apresenta-se o desenvolvimento de um sistema que permite monitorar a atividade cardíaca de pessoas que precisam de observação permanente. Esses registros são observáveis com mínimo atraso a respeito do momento em que acontecem, sendo armazenados e enviados por meio de uma conexão de internet ao implantar a tecnologia sem fio Zigbee. Utilizou-se o software Labview para processar os dados a partir do sinal eletrocardiográfico e foi desenvolvida uma interface gráfica para visualizar os sinais adquiridos. Após o processo de aquisição, isolamento, filtro analógico no dispositivo portátil, transmissão sem fio e recepção por parte de um computador, foi realizada o filtro digital ao sinal cardíaco adquirido para obter o sinal ECG filtrado no computador local.