http://hdl.handle.net/10468/45 Mon, 20 May 2013 15:15:50 GMT 2013-05-20T15:15:50Z http://hdl.handle.net/10468/953 Arrow-mounted ballistic system for measuring performance of arrows equipped with hunting broadheads Barton, John; Včelák, Jan; Torres-Sanchez, Javier; O'Flynn, Brendan; Ó Mathúna, S. Cian; Donahoe, Robert V. Measuring an arrow's ballistic performance such as arrow velocity on impact, total time of flight and arrow shaft oscillation is challenging because of the dynamic nature of arrow flight. This challenge becomes increasingly difficult as the distance of the shot increases. It is also of great interest to bowhunters to understand the ballistic performance of arrows that include hunting broadheads. A miniaturized, sensory data acquisition system, located in the arrow tip and engineered to withstand the high accelerations experienced at launch and impact, enables the precise measurement of arrow ballistics in flight. By continuously recording arrow drag in flight, the system enables measurement of the ballistic performance of an arrow as it travels downrange. The authors have also built an adapter that is connected to the housing of the sensing system to allow for comparative ballistic tests to be performed on hunting broadheads. Here, we present results obtained using the sensing system to perform initial testing on two commercially available broadheads at shot distances of approximately 45 m. Sun, 01 Jan 2012 00:00:00 GMT http://hdl.handle.net/10468/953 2012-01-01T00:00:00Z http://hdl.handle.net/10468/576 Biomechanical performance measurement using wireless inertial sensors for professional and recreational darts players Walsh, Michael; Tyndyk, Magdalena; Barton, John; O'Flynn, Brendan; Ó Mathúna, S. Cian Thu, 01 Dec 2011 00:00:00 GMT http://hdl.handle.net/10468/576 2011-12-01T00:00:00Z http://hdl.handle.net/10468/506 A mobile gateway for remote interaction with wireless sensor networks Angove, Philip; O'Grady, Michael; Hayes, Jer; O'Flynn, Brendan; O'Hare, Hare, G. M. P. (Greg M. P.); Diamond, Dermot Wireless Sensor Networks (WSNs) almost invariably support a centralised network management model. Though the data gathering function is conducted remotely, such data is usually routed via data sinks to central servers for processing, storage, visualisation and interpretation. However, the issue of supporting remote access to WSNs and individual sensor nodes whilst in their physical environment has not been viewed as a priority. It is envisaged that this situation will change as WSNs proliferate in a range of domains, and the potential for supporting innovative revenue-generating services manifest themselves. As a step towards realising such access, a mobile gateway has been designed and implemented. This gateway supports Zigbee as this is the predominant protocol supported by WSNs. Furthermore, it also supports Bluetooth, thereby facilitating interaction with conventional mobile devices. The gateway is programmable according to the needs of arbitrary services and applications. Thu, 01 Dec 2011 00:00:00 GMT http://hdl.handle.net/10468/506 2011-12-01T00:00:00Z http://hdl.handle.net/10468/490 Development of a microelectromechanical system (MEMS)-based multisensor platform for environmental monitoring Hautefeuille, Mathieu; O'Flynn, Brendan; Peters, Frank H.; O'Mahony, Conor Recent progress in data processing, communications and electronics miniaturization is now enabling the development of low-cost wireless sensor networks (WSN), which consist of spatially distributed autonomous sensor modules that collaborate to monitor real-time environmental conditions unobtrusively and with appropriate levels of spatial and temporal granularity. Recent and future applications of this technology range from preventative maintenance and quality control to environmental modelling and failure analysis. In order to fabricate these low-cost, low-power reliable monitoring platforms, it is necessary to improve the level of sensor integration available today. This paper outlines the microfabrication and characterization results of a multifunctional multisensor unit. An existing fabrication process for Complementary Metal Oxide Semiconductor CMOS-compatible microelectromechanical systems (MEMS) structures has been modified and extended to manufacture temperature, relative humidity, corrosion, gas thermal conductivity, and gas flow velocity sensors on a single silicon substrate. A dedicated signal conditioning circuit layer has been built around this MEMS multisensor die for integration on an existing low-power WSN module. The final unit enables accurate readings and cross-sensitivity compensation thanks to a combination of simultaneous readings from multiple sensors. Real-time communication to the outside world is ensured via radio-frequency protocols, and data collection in a serial memory is also made possible for diagnostics applications. Tue, 01 Nov 2011 00:00:00 GMT http://hdl.handle.net/10468/490 2011-11-01T00:00:00Z