Navegando por Assunto "Pontes de Wheatstone"

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Acesso aberto (Open Access)
Desenvolvimento e implementação de um sistema de monitoramento de integridade estrutural baseado em rede de sensores
(Universidade Federal do Pará, 2016-08-12) NUNES, Flávio Hernan Figueiredo; KLAUTAU JÚNIOR, Aldebaro Barreto da Rocha; http://lattes.cnpq.br/1596629769697284
The objective of this dissertation is show the design of a structural integrity monitoring system, employing sensor network. The project of sensor node allows many kind of sensors, such as electrical strain gage, accelerometer, temperature sensor, humidit sensor, also the sensor node is capable of communicating via wireless and wired technology. In contrast to conventional systems that are centralized and employ long cables, the use of a sensor network is a decentralized approach, allowing the sensors are closer to the conditioning circuit, this brings certain bene_ts, such as reducing the length of the sensor cables decreasing the uptake of electromagnetic noise and decrease the impedance of the cable, improving the response signals generated by sensors. They will be presented details of the circuit and the sensor node communication.
Acesso aberto (Open Access)
Projeto e implementação de um nodo sensor para aquisição de sinais de extensômetros em redes de sensores sem fio aplicado ao monitoramento de deformações em estruturas
(Universidade Federal do Pará, 2012-07-09) ATAÍDE, Rodrigo Williams Rodrigues; KLAUTAU JÚNIOR, Aldebaro Barreto da Rocha; http://lattes.cnpq.br/1596629769697284
This dissertation’s main objective is to propose a node wireless sensor for use in wireless sensor networks, in data strain gage acquisition systems. The acquisition system for the strain is based on the Wheatstone bridge and enables various settings. The processing and wireless communication is performed by ATmega128RFA1, composed of a microcontroller and a radio-frequency transceiver with the Zigbee standard. The node is designed to ensure reliability in data acquisition and be fully controlled remotely. Among the controllable parameters are: the signal gain and sampling rate. In addition, the node has resources to make the balance of the Wheatstone bridge automatically. The choice of components, based on criteria related to energy consumption and cost the same. It was designed a printed circuit board (PCB) for the node, and regarding it, estimates of energy consumption and value of the prototype were made, with the aim of analyzing its viability. Besides the design of the sensor node, the dissertation presents the proposal of its integration in a wireless sensor network (WSN), including the suggestion of complementary hardware and software developments. For testing, a node sensor was constructed experimentally and used a force transducer.