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Limited By:	Author = Martinez-Catala, Rafael V.;

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A demonstration of wireless sensing for long-term monitoring of water quality (2009)

Regan, Fiona; Lawlor, Antoin; O'Flynn, Brendan; Torres-Sanchez, Javier; Martínez-C...

A demonstration of wireless sensing for long-term monitoring of water quality (2009)

Regan, Fiona; Lawlor, Antoin; O'Flynn, Brendan; Torres-Sanchez, Javier; Martínez-Català, Rafael V.; Ó Mathúna, S. Cian; Wallace, John

Abstract:

At a time when technological advances are providing new sensor capabilities, novel network capabilities, long-range communications technologies and data interpreting and delivery formats via the World Wide Web, we never before had such opportunities to sense and analyse the environment around us. However, the challenges exist. While measurement and detection of environmental pollutants can be successful under laboratory-controlled conditions, continuous in-situ monitoring remains one of the most challenging aspects of environmental sensing. This paper describes the development and test of a multi-sensor heterogeneous real-time water monitoring system. A multi-sensor system was deployed in the River Lee, County Cork, Ireland to monitor water quality parameters such as pH, temperature, conductivity, turbidity and dissolved oxygen. The R. Lee comprises of a tidal water system that provides an interesting test site to monitor. The multi-sensor system set-up is described and results o...

http://hdl.handle.net/10468/180

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Energy scavenging for long-term deployable wireless sensor networks (2007)

Ó Mathúna, S. Cian; O'Donnell, Terence; Martinez-Catala, Rafael V.; Rohan, James F...

Energy scavenging for long-term deployable wireless sensor networks (2007)

Ó Mathúna, S. Cian; O'Donnell, Terence; Martinez-Catala, Rafael V.; Rohan, James F.; O'Flynn, Brendan

Abstract:

The coming decade will see the rapid emergence of low cost, intelligent, wireless sensors and their widespread deployment throughout our environment. While wearable systems will operate over communications ranges of less than a meter, building management systems will operate with inter-node communications ranges of the order of meters to tens of meters and remote environmental monitoring systems will require communications systems and associated energy systems that will allow reliable operation over kilometers. Autonomous power should allow wireless sensor nodes to operate in a “deploy and forget” mode. The use of rechargeable battery technology is problematic due to battery lifetime issues related to node power budget, battery self-discharge, number of recharge cycles and long-term environmental impact. Duty cycling of wireless sensor nodes with long “SLEEP” times minimises energy usage. A case study of a multi-sensor, wireless, building management system operating using the Zigbee...

http://hdl.handle.net/10468/7658

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Modeling power in multi-functionality sensor network applications (2008)

Agarwal, Rachit; Martínez-Català, Rafael V.; Harte, Seán; Segard, Cedric; O'Flynn,...

Modeling power in multi-functionality sensor network applications (2008)

Agarwal, Rachit; Martínez-Català, Rafael V.; Harte, Seán; Segard, Cedric; O'Flynn, Brendan

Abstract:

With the migration of a Wireless Sensor Network (WSN) over various evolving applications, power estimation and profiling during the design cycle become critical issues and present hurdles in reducing the design time. Furthermore, with a growing size of the network, simulating the behavior of each sensor node is not feasible. It is important to devise an approach that provides a network-wide picture of power consumption and of variations in power usage under changes in the network and/or node application in the network. In this paper, we present a modular power estimation technique which simplifies the power modeling of any sensor network application. In particular, we are interested in analyzing the behavior of power consumption if one or more modules of the WSN platform in the application are changed during the design cycle or after the deployment. The proposed technique is susceptible to applications changes on the fly and is particularly beneficial in networks with large number o...

http://hdl.handle.net/10468/96

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Wireless sensor node design for heterogeneous networks (2008)

Harte, Seán; O'Flynn, Brendan; Martínez-Català, Rafael V.; Popovici, Emanuel M.

Wireless sensor node design for heterogeneous networks (2008)

Harte, Seán; O'Flynn, Brendan; Martínez-Català, Rafael V.; Popovici, Emanuel M.

Abstract:

Two complementary wireless sensor nodes for building two-tiered heterogeneous networks are presented. A larger node with a 25 mm by 25 mm size acts as the backbone of the network, and can handle complex data processing. A smaller, cheaper node with a 10 mm by 10 mm size can perform simpler sensor-interfacing tasks. The 25mm node is based on previous work that has been done in the Tyndall National Institute that created a modular wireless sensor node. In this work, a new 25mm module is developed operating in the 433/868 MHz frequency bands, with a range of 3.8 km. The 10mm node is highly miniaturised, while retaining a high level of modularity. It has been designed to support very energy efficient operation for applications with low duty cycles, with a sleep current of 3.3 μA. Both nodes use commercially available components and have low manufacturing costs to allow the construction of large networks. In addition, interface boards for communicating with nodes have been developed for ...

http://hdl.handle.net/10468/149

Irish Research Council for Science Engineering and Technology

Displaying Results 1 - 4 of 4 on page 1 of 1