Institutions
|
About Us
|
Help
|
Gaeilge
0
1000
Home
Browse
Advanced Search
Search History
Marked List
Statistics
A
A
A
Show search options
Hide search options
Search using:
All
Any
None of these
Exact Phrase
in
Keyword (All Fields)
Title
Author
Subject
Institution
Funder
All
Any
None of these
Exact Phrase
in
Keyword (All Fields)
Title
Author
Subject
Institution
Funder
All
Any
None of these
Exact Phrase
in
Keyword (All Fields)
Title
Author
Subject
Institution
Funder
All
Any
None of these
Exact Phrase
in
Keyword (All Fields)
Title
Author
Subject
Institution
Funder
From
2013
2012
2011
2010
2009
2008
2007
2006
2005
2004
2003
2002
2001
2000
1999
1998
1997
1996
1995
1994
1993
1992
1991
1990
1989
1988
1987
1986
1985
1984
1983
1982
1981
1980
1979
1978
1977
1976
1975
1974
1973
1972
1971
1970
1969
1968
1967
1966
1965
1964
1963
1962
1961
1960
1959
1958
1957
1956
1955
1954
1953
1952
1951
1950
1949
1948
1947
1946
1944
1943
1942
1941
1940
1939
1938
1937
1936
1935
1934
1933
1932
1931
1930
1929
1928
1927
1925
1923
1920
1919
1917
1915
1914
1913
1912
1911
1909
1908
1907
1906
1905
1904
1903
1902
1901
1900
1899
1898
1897
1896
1895
1894
1893
1892
1891
1890
1889
1888
1887
1886
1885
1884
1883
1882
1881
1880
1879
1878
1877
1876
1875
1874
1873
1872
1871
1870
1869
1867
1866
1865
1864
1862
1861
1859
1858
1857
1856
1855
1854
1853
1852
1851
1849
To
2013
2012
2011
2010
2009
2008
2007
2006
2005
2004
2003
2002
2001
2000
1999
1998
1997
1996
1995
1994
1993
1992
1991
1990
1989
1988
1987
1986
1985
1984
1983
1982
1981
1980
1979
1978
1977
1976
1975
1974
1973
1972
1971
1970
1969
1968
1967
1966
1965
1964
1963
1962
1961
1960
1959
1958
1957
1956
1955
1954
1953
1952
1951
1950
1949
1948
1947
1946
1944
1943
1942
1941
1940
1939
1938
1937
1936
1935
1934
1933
1932
1931
1930
1929
1928
1927
1925
1923
1920
1919
1917
1915
1914
1913
1912
1911
1909
1908
1907
1906
1905
1904
1903
1902
1901
1900
1899
1898
1897
1896
1895
1894
1893
1892
1891
1890
1889
1888
1887
1886
1885
1884
1883
1882
1881
1880
1879
1878
1877
1876
1875
1874
1873
1872
1871
1870
1869
1867
1866
1865
1864
1862
1861
1859
1858
1857
1856
1855
1854
1853
1852
1851
1849
Optionally, filter by:
(Leave unchecked to search all fields)
Item Type
Book
Book chapter
Conference item
Contribution to newspaper/magazine
Doctoral thesis
Journal article
Master thesis (research)
Master thesis (taught)
Multimedia
Patent
Report
Review
Working paper
Other
Peer Review Status
Peer reviewed
Non peer reviewed
Unknown
Institution
Dublin City University
Dublin Institute of Technology
NUI Galway
NUI Maynooth
Trinity College Dublin
University College Cork
University College Dublin
University of Limerick
Funder
Enterprise Ireland (EI)
Environmental Protection Agency (EPA)
Health Research Board (HRB)
Higher Education Authority (HEA)
Irish Aid
Irish Research Council for Humanities and Social Sciences (IRCHSS)
Irish Research Council for Science Engineering and Technology (IRCSET)
Marine Institute
Science Foundation Ireland (SFI)
Teagasc
Language
Irish
English
Danish
French
German
Interlingue; Occidental
Italian
Japanese
Spanish; Castilian
Current Search:
All of 'Electronic', '&', 'Electrical' and 'Engineering' in all fields;
454 items found
Sort by
Relevance
Title
Author
Item type
Date
Institution
Peer review status
Language
Order
Ascending
Descending
25
50
100
per page
5
6
7
8
9
10
11
12
13
14
15
Bibtex
CSV
EndNote
RefWorks
RIS
XML
Displaying Results 226 - 250 of 454 on page 10 of 19
Marked
Mark
Intelligibility of Electrolarynx Speech Using a Novel Actuator
(2011)
Madden, Brian; Nolan, Mark; Burke, Ted; Condron, James; Coyle, Eugene
Intelligibility of Electrolarynx Speech Using a Novel Actuator
(2011)
Madden, Brian; Nolan, Mark; Burke, Ted; Condron, James; Coyle, Eugene
Abstract:
During voiced speech, the larynx provides quasi-periodic acoustic excitation of the vocal tract. Following a laryngectomy, some people speak using an electrolarynx which replaces the excitatory function of the absent larynx. Drawbacks of conventional electrolarynx designs include the buzzing monotonic sound emitted, the need for a free hand to operate the device, and difficulty experienced by many laryngectomees in adapting to its use. Despite these shortcomings, it remains the preferred method of speech rehabilitation for a substantial minority of laryngectomees. In most electrolarynxes, mechanical vibrations are produced by a linear electromechanical actuator, the armature of which percusses against a metal or plastic plate at a frequency within the range of glottal phonation. As part of the ongoing development of a hands-free alternative to the conventional electrolarynx, the authors have developed a novel actuator which is based on a lightweight pager motor similar to those used...
http://arrow.dit.ie/teapotcon/13
Marked
Mark
Wideband Printed Monopole Design Using a Genetic Algorithm
(2012)
John, Matthias; Ammann, Max
Wideband Printed Monopole Design Using a Genetic Algorithm
(2012)
John, Matthias; Ammann, Max
Abstract:
<p>A method for the design and optimisation of wide-band printed planar monopoles using a genetic algorithm is presented. This novel technique employs overlapping sub-patches which ensures electrical contact in such constellations where two sub-patches are touching only at the corner, hence re-ducing losses. The method was usd optimisation of wide-band printed planar monopoles using a genetic algorithm is presented. This novel technique employs overlapping sub-patches which ensures electrical contact in such constellations where two sub-patches are touching only at the corner, hence re-ducing losses. The method was used to design a wideband monopole antenna with application in higher cellular, WLAN and UWB. Furthermore, the technique is modified for multi-goal optimisation to achieve multiple bands and reduce the lower edge frequencyed to design a wideband monopole antenna with application in higher cellular, WLAN and UWB. Furthermore, the technique is modified fo...
http://arrow.dit.ie/ahfrcart/25
Marked
Mark
Small Antenna Options for Ultra-Wideband (UWB) Applications
(2009)
Kearney, David, (Thesis)
Small Antenna Options for Ultra-Wideband (UWB) Applications
(2009)
Kearney, David, (Thesis)
Abstract:
<p>Ultra-Wideband (UWB) systems provide a means for short range high data rate wireless transmission between electronic devices. Portable devices and in particular, mobile handsets, have the potential to harness the unprecedented connectivity associated with UWB’s high speed, low power data transfer. Over the course of this work, a number of small antenna options for UWB mobile handset applications are presented. Two key subgroups of the 3.1 –10.6GHz UWB band are chosen and suitable antennas designed for both bands. At the upper end of the band, a ceramic planar inverted-F antenna is proposed to cover band groups 3 & 6 (6.3 – 9GHz). At the lower end of the band, a novel Dual-Band PIFA structure is presented and optimised to cover the band group 1 bands (3.1 – 4.8GHz). Design work is carried out using CST Microwave Studio simulation software, and all parameter sweeps of critical dimensions are presented, as well as an in-depth examination of E-fields, Surface Currents and R...
http://arrow.dit.ie/scienmas/55
Marked
Mark
Resolution Investigation of a Ratiometric Wavelength Measurement System
(2007)
Wang, Quian; Rajan, Ginu; Wang, Pengfei; Farrell, Gerald
Resolution Investigation of a Ratiometric Wavelength Measurement System
(2007)
Wang, Quian; Rajan, Ginu; Wang, Pengfei; Farrell, Gerald
Abstract:
Theoretical analysis and experimental investigations are presented on the resolution of a ratiometric wavelength measurement system. Theoretical modeling indicates that the resolution of a ratiometric wavelength measurement system is determined by the signal-to-noise ratio of the input signal and the noise of the photodetectors associated with optical-to-electronic conversion. For experimental verification, a ratiometric system employing a macrobending standard single-mode fiber is developed and corresponding results are in good agreement with the theoretical prediction.
http://arrow.dit.ie/engscheceart/83
Marked
Mark
An investigation into non-verbal sound-based modes of human-to-computer communication with rehabilitation applications
(2003)
Burke, Ted
An investigation into non-verbal sound-based modes of human-to-computer communication with rehabilitation applications
(2003)
Burke, Ted
Abstract:
During the course of our work in the National Rehabilitation Hospital in Ireland we have encountered patients who, while unable to speak, are capable of making reproducible utterances. We present techniques used to harness such utterances, in addition to whistling, as a means of communication and control. A simple technique for identifying the phonemes /o/ and /s/ (in single-symbol ARPAbet notation) is presented with applications. The use of pitch variation as a means of controlling a continuously variable parameter is described with two applications - a microcontroller based light dimmer switch and a computer program which facilitates mouse pointer control. Finally, a technique for the recognition of short note sequences is presented. A program is described which allows arbitrary commands to be executed in response to tunes either sung or whistled by the user. These commands may be used to switch on or off electrical appliances in the home.
http://arrow.dit.ie/teapotcon/7
Marked
Mark
Intelligibility of Electrolarynx Speech using a Novel Hands-Free Actuator
(2011)
Madden, Brian; Nolan, Mark; Burke, Ted; Condron, James; Coyle, Eugene
Intelligibility of Electrolarynx Speech using a Novel Hands-Free Actuator
(2011)
Madden, Brian; Nolan, Mark; Burke, Ted; Condron, James; Coyle, Eugene
Abstract:
During voiced speech, the larynx provides quasi-periodic acoustic excitation of the vocal tract. In most electrolarynxes, mechanical vibrations are produced by a linear electromechanical actuator, the armature of which percusses against a metal or plastic plate at a frequency within the range of glottal excitation. In this paper, the intelligibility of speech produced using a novel hands-free actuator is compared to speech produced using a conventional electrolarynx. Two able-bodied speakers (one male, one female) performed a closed response test containing 28 monosyllabic words, once using a conventional electrolarynx and a second time using the novel design. The resulting audio recordings were randomized and replayed to ten listeners who recorded each word that they heard. The results show that the speech produced using the hands-free actuator was substantially more intelligible to the majority of listeners than that produced using the conventional electrolarynx. The new actuator...
http://arrow.dit.ie/teapotcon/10
Marked
Mark
A New High Power Parallel Converter Scheme for Active Power Filters
(2004)
Basu, Malabika; Das, S. P.; Dubey, Gopal
A New High Power Parallel Converter Scheme for Active Power Filters
(2004)
Basu, Malabika; Das, S. P.; Dubey, Gopal
Abstract:
<p>A new topology for efficient utilisation of parallel converters as VAR compensators and active power filters (APF) for high power loads is proposed. Because of limited power handling capacity of individual devices, paralleling is the choice to increase rating of equipment, while keeping the THD of the current at the PCC within the agency specified standards. It has been reported in the literature that paralleling several converters, rather than switches, is more reliable in sharing of load. From this perspective, multilevel converters carry lot of weight, as their typical power circuit configuration limits the stress on individual devices to an appreciable extent. Also, they have the advantage of low switching frequency and full utilisation of switching devices, which is essential in high-power applications. These advantages have been utilised in parallel combination with a low-power high-frequency current-controlled APF, such that the higher order harmonics can be eliminat...
http://arrow.dit.ie/engscheleart2/1
Marked
Mark
A Novel Framework for Radio Resource Management in IEEE 802.11 Wireless LANs
(2005)
Davis, Mark; Raimondi, Tristan
A Novel Framework for Radio Resource Management in IEEE 802.11 Wireless LANs
(2005)
Davis, Mark; Raimondi, Tristan
Abstract:
<p>In this paper we address the need to characterize and quantify resource usage in IEEE 802.11 WLANs in order to support radio resource management. We present a compact and intuitive framework for performance characterization and resource utilization that is based upon the concept of MAC bandwidth components. These MAC bandwidth components are directly related to the transmission rate and serve to quantify the resource requirements associated with accessing the wireless medium. We also introduce a graphical technique for presenting these MAC bandwidth components that illustrates how WLAN stations interact in contending for access to the wireless medium. We demonstrate the usefulness of this framework for radio resource management using a number of computer simulations based upon the emerging IEEE 802.11e QoS standard.</p>
http://arrow.dit.ie/commcon/28
Marked
Mark
A Fiber Bragg Grating-Based All-Fiber Sensing Systems for Telerobotic Cutting Applications
(2010)
Rajan, Ginu; Callaghan, Dean; Semenova, Yuliya; McGrath, Mark; Coyle, Eugene; Farrell, ...
A Fiber Bragg Grating-Based All-Fiber Sensing Systems for Telerobotic Cutting Applications
(2010)
Rajan, Ginu; Callaghan, Dean; Semenova, Yuliya; McGrath, Mark; Coyle, Eugene; Farrell, Gerald
Abstract:
A fiber Bragg grating (FBG)-based strain sensing system for minimally invasive telerobotic cutting applications is presented in this paper. Investigations assume that a scissor blade can be approximated as a uniformly tapered cantilever beam. A replica of the scissor blade is produced and strain characterization has been carried out using an FBG sensor system. Results are validated against measurements obtained using conventional electrical resistance strain gauges. The scissor blade experiences both direct and lateral forces during cutting, hence the system is characterized for a direct load range of 0-30 N and a lateral load range of 0-10 N. The results show a very good linear response for direct loading and some sensitivity to lateral loading. An actual sensorized scissor blade prototype is also characterized and results compared with that of the replica blade. The FBG interrogation system used was a macro-bend fiber filter-based ratiometric system. The use of FBGs together with ...
http://arrow.dit.ie/engscheceart/57
Marked
Mark
Hardware implementation of a real-time 3D video acquisition system
(2010)
Andorko, Istvan; Corcoran, Peter M.
Hardware implementation of a real-time 3D video acquisition system
(2010)
Andorko, Istvan; Corcoran, Peter M.
Abstract:
An implementation of a real-time 3D video acquisition system on a single FPGA is presented. Our approach is based on the use of stereo image sensors and can display real-time 3D video when combined with shutter glasses. The 3D effect is generated based on the parallax of the stereo sensors. An overview of the system architecture is given, including some details of the FPGA implementation of actual image processing pipeline. This architecture provides the basis for a low-cost, personal 3D imaging appliance.
http://hdl.handle.net/10379/1437
Marked
Mark
Integration of Microstrip Patch Antenna with Polycrystalline Silicon Solar Cell
(2009)
Shynu, S.V.; Roo Ons, Maria; McEvoy, Patrick; Ammann, Max; McCormack, Sarah; Norton, Brian
Integration of Microstrip Patch Antenna with Polycrystalline Silicon Solar Cell
(2009)
Shynu, S.V.; Roo Ons, Maria; McEvoy, Patrick; Ammann, Max; McCormack, Sarah; Norton, Brian
Abstract:
<p>The implementation of a polycrystalline silicon solar cell as a microwave groundplane in a low-profile, reduced-footprint microstrip patch antenna design for autonomous communication applications is reported. The effects on the antenna / solar performances due to the integration, different electrical conductivities in the silicon layer and variation in incident light intensity are investigated. The antenna sensitivity to the orientation of the anisotropic solar cell geometry is discussed.</p>
http://arrow.dit.ie/ahfrcart/14
Marked
Mark
An Experimental Analysis of the Call Capacity of IEEE 802.11b Wireless Local Area Networks for VoIP Telephony
(2006)
Keegan, Brian; Davis, Mark
An Experimental Analysis of the Call Capacity of IEEE 802.11b Wireless Local Area Networks for VoIP Telephony
(2006)
Keegan, Brian; Davis, Mark
Abstract:
<p>In this paper we present the results from an experimental study of the call capacity of an IEEE 802.11b network when using VoIP telephony. Experiments include increasing the number of VoIP users in a wireless test-bed and increasing the level of background traffic until network saturation occurs. The experiments allow us to perform an analysis of the access point (AP) buffer dynamics. Results show that the network is capable of supporting up to 16 VoIP stations (STAs). Due to the operation of the IEEE 802.11 medium access control (MAC) mechanism, the AP acts as a bottleneck for all traffic destined for wireless STAs, in that significant delays can be incurred by VoIP packets which can lead to a poor perceived QoS by users. Consequently the performance of the AP downlink is the critical component in determining VoIP call capacity. We also show that large peak loads occur during periods of double-talk effectively reducing the capacity of the network.</p>
http://arrow.dit.ie/commcon/3
Marked
Mark
A Hybrid Fiber Optic Sensing System for Simultaneous Strain and Temperature Measurement and its Application
(2010)
Rajan, Ginu; Milenko, Karolina; Lesiak, Piotr; Semenova, Yuliya; Boczkowska, Anna; Rama...
A Hybrid Fiber Optic Sensing System for Simultaneous Strain and Temperature Measurement and its Application
(2010)
Rajan, Ginu; Milenko, Karolina; Lesiak, Piotr; Semenova, Yuliya; Boczkowska, Anna; Ramakrishnan, Manjusha; Jedrzejewski, Kazimierz; Domanski, Andrzej; Wolinski, Tomasz; Farrell, Gerald
Abstract:
A hybrid fiber optic sensor by integrating polarimetric fiber sensors and fiber Bragg grating sensors for simultaneous strain and temperature measurement is presented in this paper. Two types of polarimetric fiber sensors are used; a Panda fiber and a polarization maintaining photonic crystal fiber. The polarimetric strain sensors give the average strain and temperature information, while the fiber Bragg grating sensors give localized strain information. Two applications of the proposed configuration are also demonstrated in this paper. In the composite materials three fiber sensors are used while for other engineering applications a temperature insensitive polarimetric fiber sensor can be used together with an FBG sensor to measure strain and temperature simultaneously.
http://arrow.dit.ie/engscheceart/55
Marked
Mark
Augmented control of a hands-free electrolarynx
(2011)
Madden, Brian; Condron, James; Coyle, Eugene
Augmented control of a hands-free electrolarynx
(2011)
Madden, Brian; Condron, James; Coyle, Eugene
Abstract:
During voiced speech, the larynx acts as the sound source, providing a quasi-periodic excitation of the vocal tract. Following a total laryngectomy, some people speak using an electrolarynx which employs an electromechanical actuator to perform the excitatory function of the absent larynx. Drawbacks of conventional electrolarynx designs include the monotonic sound emitted, the need for a free-hand to operate the device, and the difficulty experienced by many laryngectomees in adapting to its use. One improvement to the electrolarynx, which clinicians and users frequently suggest, is the provision of a convenient hands-free control facility. This would allow more natural use of body language, as well as enabling the user to perform other manual tasks whilst speaking. An additional enhancement is the redevelopment of the devices' actuator to remove the self-radiated buzzing sound which is emitted during operation. The overall goal of this research is to investigate the implementa...
http://arrow.dit.ie/teapotcon/18
Marked
Mark
Novel Bioelectrical Measurement using a Digital Biopotential Monode
(2011)
Nolan, Mark; Burke, Edward; Coyle, Eugene
Novel Bioelectrical Measurement using a Digital Biopotential Monode
(2011)
Nolan, Mark; Burke, Edward; Coyle, Eugene
Abstract:
In conventional biopotential recording, two or more electrodes are placed on the body. A unipolar lead records the time-varying electrical potential at a single point (relative to a reference potential) via one signal electrode. A bipolar lead records the time-varying potential difference between two points via two signal electrodes. In each case, the signal electrodes are connected to high impedance amplifier inputs, while an additional electrode provides a low-impedance path between the amplifier and human subject. Bipolar leads are usually preferred since interference appearing at both signal electrodes can be eliminated using an instrumentation amplifier with high CMRR. A drawback of bipolar lead recording is that wires must connect all electrodes to the amplifier. This paper presents preliminary work on a novel design for a digital biopotential measurement device which we call the biopotential monode.
http://arrow.dit.ie/teapotcon/21
Marked
Mark
Multi-channel Audio Time-scale Modification
(2005)
Dorran, David; Lawlor, Robert; Coyle, Eugene
Multi-channel Audio Time-scale Modification
(2005)
Dorran, David; Lawlor, Robert; Coyle, Eugene
Abstract:
<p>Phase vecoder based approaches to audio time-scale modification introduce a reverberant artefact into the time scaled output. Recent techniques have been developed to reduce the presence of this artefact; however, these techniques have the effect of introducing additional issues relating to their application to multi-channel recordings. This paper addresses these issues by collectively analysing all channels prior to time-scaling each individual channel.</p>
http://arrow.dit.ie/argcon/66
Marked
Mark
The Role of Micro Wind Generation in Ireland’s Energy Future
(2012)
Sunderland, Keith; Conlon, Michael
The Role of Micro Wind Generation in Ireland’s Energy Future
(2012)
Sunderland, Keith; Conlon, Michael
Abstract:
<p>This paper defines the current position for micro-generation, with particular reference to the potential for micro-wind units, in the Irish electricity supply system. A network model is developed using the <em>Distflow</em> method of load flow analysis and is applied to consider the appropriate level of micro-generation penetration.</p>
http://arrow.dit.ie/engscheleart/173
Marked
Mark
Feasibility of Using Passive Monitoring Techniques in Mesh Networks for the Support of Routing
(2010)
Zhang, Chenzhe, (Thesis)
Feasibility of Using Passive Monitoring Techniques in Mesh Networks for the Support of Routing
(2010)
Zhang, Chenzhe, (Thesis)
Abstract:
<p>In recent years, Wireless Mesh Networks (WMNs) have emerged as a promising solution to provide low cost access networks that extend Internet access and other networking services. Mesh routers form the backbone connectivity through cooperative routing in an often unstable wireless medium. Therefore, the techniques used to monitor and manage the performance of the wireless network are expected to play a significant role in providing the necessary performance metrics to help optimize the link performance in WMNs. This thesis initially presents an assessment of the correlation between passive monitoring and active probing techniques used for link performance measurement in single radio WMNs. The study reveals that by combining multiple performance metrics obtained by using passive monitoring, a high correlation with active probing can be achieved. The thesis then addresses the problem of the system performance degradation associated with simultaneous activation of multiple radi...
http://arrow.dit.ie/engmas/35
Marked
Mark
Wavelet Based Islanding Detection of DC-AC Inverter Interfaced DG Systems
(2010)
Hanif, Mohamed Moin; Basu, Malabika; Gaughan, Kevin
Wavelet Based Islanding Detection of DC-AC Inverter Interfaced DG Systems
(2010)
Hanif, Mohamed Moin; Basu, Malabika; Gaughan, Kevin
Abstract:
The increased penetration of distributed generation (DG) often connected to grid through dc-ac interface has made islanding detection an important and challenging issue to power engineers. Several methods based on passive and active detection scheme have been proposed in the literature. While passive schemes have a large non detection zone (NDZ), concern has been raised on active method due to its degrading power quality effect. This paper proposes a wavelet based passive islanding detection scheme with almost zero NDZ for dc-ac inverter interfaced grid connected DGs. The key idea is to utilize the spectral changes in the higher frequency components of PCC voltage occurring after islanding condition. The effectiveness of the proposed method is tested through case studies on a photovoltaic DG system.
http://arrow.dit.ie/engscheleart/133
Marked
Mark
Playing Technique and Violin Timbre:Detecting Bad Playing
(2010)
Charles, Jane, (Thesis)
Playing Technique and Violin Timbre:Detecting Bad Playing
(2010)
Charles, Jane, (Thesis)
Abstract:
<p>For centuries, luthiers have committed to working towards better understanding and improving the sound characteristics and playability of violins. With advances in technology and signal processing, studies attempting to define a violin’s sound quality via physical characteristics and resonance patterns have ensued. Existing work has primarily focused on physical aspects reflecting and instrument’s sound quality. In the music information retrieval domain, advances have been made in areas such as instrument identification tasks. Although much research has been completed on finding suitable features from which musical instruments can be represented, little work has focused on the violin’s complete timbre space and the effect a player has on the sound produced. This thesis specifically focuses on representing violin timbre such that a computer can detect the sound associated with a beginner from that of a professional standard player and detect typical beginner playing faults b...
http://arrow.dit.ie/engdoc/28
Marked
Mark
Low-Cost Wavelength Measurement Based on a Macrobending Single-Mode Fiber
(2006)
Rajan, Ginu; Farrell, Gerald; Freir, Thomas; Wang, Pengfei
Low-Cost Wavelength Measurement Based on a Macrobending Single-Mode Fiber
(2006)
Rajan, Ginu; Farrell, Gerald; Freir, Thomas; Wang, Pengfei
Abstract:
A low-cost all-fiber wavelength measurement technique is proposed and demonstrated. A macrobending standard single-mode fiber is developed as an edge filter with an optimal design and simple surface processing. A ratiometric wavelength measurement system employing the developed macrobending fiber filter demonstrates a resolution of ∼10 pm in a wavelength range from 1500 to 1560 nm with ease of assembly and calibration.
http://arrow.dit.ie/engscheceart/64
Marked
Mark
A Macrobending Singlemode Fiber Refractive Index Sensor for Low Refractive Index Liquids
(2010)
Wang, Pengfei; Semenova, Yuliya; Li, Yong; Wu, Qiang; Farrell, Gerald
A Macrobending Singlemode Fiber Refractive Index Sensor for Low Refractive Index Liquids
(2010)
Wang, Pengfei; Semenova, Yuliya; Li, Yong; Wu, Qiang; Farrell, Gerald
Abstract:
<p>An all-fiber refractive index sensor with a simple configuration is proposed and investigated. The proposed fiber refractometer consists of a full-loop structure of bare high-bend loss singlemode fiber-1060XP, employing the well-known whispering gallery mode (WGM) effect induced by the evanescent wave excitation to measure the refractive index of an external medium. A competitive sensitivity is achieved (average 725.76nm/RIU at a bend diameter of 19.3mm) compared with other fiber-optic sensors, plus benefits resulting from simplicity, low cost and ease of fabrication.</p>
http://arrow.dit.ie/engscheceart/63
Marked
Mark
Polarization Dependence of Bend Loss for a Standard Singlemode Fiber
(2007)
Wag, Qian; Rajan, Ginu; Wang, Pengfei; Farrell, Gerald
Polarization Dependence of Bend Loss for a Standard Singlemode Fiber
(2007)
Wag, Qian; Rajan, Ginu; Wang, Pengfei; Farrell, Gerald
Abstract:
Polarization dependence of bend loss caused by the polymer coating layer for a standard singlemode fiber (SMF28) is investigated theoretically and experimentally. Bend loss for SMF28 for both the TE and TM mode is calculated separately. Normalized polarization dependent loss is proposed for the characterization of the polarization sensitivity of bend loss for different bend radii. Corresponding experimental tests are presented, which agree with the theoretical results. Both the theoretical and experimental results show that the polymer coating layer has a significant influence on the polarization dependence of bend loss.
http://arrow.dit.ie/engscheceart/61
Marked
Mark
Modeling Liquid-Crystal Devices with the Three-Dimensional Full-Vector Beam Propagation Method
(2006)
Wang, Qian; Farrell, Gerald; Semenova, Yuliya
Modeling Liquid-Crystal Devices with the Three-Dimensional Full-Vector Beam Propagation Method
(2006)
Wang, Qian; Farrell, Gerald; Semenova, Yuliya
Abstract:
Simulation of light propagation within nematic liquid-crystal (LC) devices is considered, of which the director is aligned normal to the z axis. A three-dimensional full-vector finite-difference beam propagation method for an anisotropic medium is presented and an alternating direction implicit scheme is adopted. Simulations of light propagation in a bulk polarization converter, a waveguide with a LC covering layer, and an integrated polarization splitter and optical switch are presented. Comparison with an existing simulation method is carried out for beam behavior within the bulk polarization converter. The effect of strong surface anchoring of a LC cell on the beam behaviors within the integrated switch is also demonstrated.
http://arrow.dit.ie/engscheceart/62
Marked
Mark
A Hybrid Highly Birefringent Fiber Optic Sensing System for Simultaneous Strain and Temperature Measurement
(2010)
Lesiak, Piotr; Rajan, Ginu; Semenova, Yuliya; Farrell, Gerald; Boczkowska, Anna; Domans...
A Hybrid Highly Birefringent Fiber Optic Sensing System for Simultaneous Strain and Temperature Measurement
(2010)
Lesiak, Piotr; Rajan, Ginu; Semenova, Yuliya; Farrell, Gerald; Boczkowska, Anna; Domanski, Andrzej; Wolinkski, Tomasz
Abstract:
A novel hybrid fiber optic sensor based on integration of polarimetric fiber sensors for simultaneous strain and temperature measurement is presented in this paper. Two types of polarimetric fibers are used: a side-hole fiber and a polarization maintaining photonic crystal fiber. The disadvantage of each sensor type can be overcome by using the sensors in a complementary manner to measure temperature independently from average strain.
http://arrow.dit.ie/engscheceart/56
Displaying Results 226 - 250 of 454 on page 10 of 19
5
6
7
8
9
10
11
12
13
14
15
Bibtex
CSV
EndNote
RefWorks
RIS
XML
Item Type
Book chapter (2)
Conference item (214)
Doctoral thesis (14)
Journal article (207)
Master thesis (research) (1)
Master thesis (taught) (13)
Working paper (1)
Other (2)
Institution
Dublin City University (31)
NUI Galway (23)
NUI Maynooth (35)
Trinity College Dublin (162)
University College Cork (3)
Dublin Institute of Technology (200)
Peer Review Status
Peer reviewed (410)
Non peer reviewed (41)
Unknown (3)
Year
2012 (10)
2011 (39)
2010 (66)
2009 (49)
2008 (28)
2007 (58)
2006 (33)
2005 (49)
2004 (43)
2003 (24)
2002 (11)
2001 (8)
2000 (10)
1999 (2)
1998 (6)
1997 (3)
1996 (4)
1995 (1)
1994 (1)
1993 (1)
1992 (3)
1991 (2)
1990 (1)
1989 (2)
built by Enovation Solutions