• Autonomous docking for work class ROVs 

  Trslić, Petar (University of Limerick, 2020)

  This thesis describes research work in the domain of underwater robotics. It is aimed towards improving performance and achieving partial or full autonomy in the rapidly increasing underwater resident robotics field, with ...
• Flexible FPGA based digital IC test development education laboratory design and application 

  Grout, Ian (IEEE Computer Society, 2020)

  In this paper, a teaching aid for digital integrated circuit (IC) test development engineering education using the field programmable gate array (FPGA) is presented and discussed. The set-up allows for different digital ...
• On the specially designed fractal metasurface-based dual-polarization converter in the THz regime 

  Bilal, R.M.H; Baqir, M.A.; Choudhury, P.K.; Ali, Muhammad Mahmood; Rahim, Arbab Abdur (Elsevier, 2020)

  A specially designed fractal metasurface-based structure was investigated as a dual-polarization converter operating in the terahertz(THz) band. The proposed converter has the ability to perform both the linear-to-cross ...
• Symmetric accelerating beam generation via all-dielectric metasurfaces 

  Ahmed, Hammad; Rahim, Arbab Abdur; Ali, Muhammad Mahmood; Maab, Husnul (Royal society of chemistry, 2020)

  Traditionally, symmetric accelerating beam (SAB) generation requires bulky optical components, which hinder the miniaturization of optical systems. Recently, metasurfaces, which are composed of sub-wavelength features, ...
• Elliptical metallic rings‑shaped fractal metamaterial absorber in the visible regime 

  Bilal, R.M.H.; Saeed, M. A.; Choudhury, P. K.; Baqir, M. A.; Kamal, W.; Ali, Muhammad Mahmood; Rahim, Arbab Abdur (Nature Research, 2020)

  Achieving the broadband response of metamaterial absorbers has been quite challenging due to the inherent bandwidth limitations. Herein, the investigation was made of a unique kind of visible light metamaterial absorber ...
• An optical fiber sensor for germicidal microwave plasma UV lamps for water and wastewater treatment 

  Fitzpatrick, Colin; Lewis, Elfed; Al-Shamma'a, AI; Lucas, J. (International Society for Optics and Photonics, 2001)

  Low-pressure mercury lamps are commonly used for germicidal applications such as water and wastewater sterilisation. The germicidal effect is due to the emission of light at 254nm, which leads to the destruction of most ...
• Enhanced sensitivity of heterocore structure surface plasmon resonance sensors based on local microstructures 

  Zhu, Wenjie; Huang, Qing; Wang, Yong; Lewis, Elfed; Yang, Minghong (International Society for Optics and Photonics, 2018)

  A method to improve the refractive index (RI) and temperature sensitivities of optical fiber based on surface plasmon resonance (SPR) sensors is proposed and experimentally demonstrated. It is realized by using a precision ...
• Time identification method of an optical blade tip timing system based on optical interrogation of surface inscribed microstructure surface features 

  Qu, Ruixuan; Luo, Yang; Chai, Quan; Liu, Yanlei; Zhang, Jianzhong; Lewis, Elfed; Yang, Jun; Yua, Libo (The International Society for Optics and Photonics, 2019)

  An optical blade tip timing scheme is presented and demonstrated experimentally using an optical microstructure surface inscribed on the blade tip. The results show that the method is not sensitive to the fluctuations of ...
• Novel layered 2D materials for ultrafast photonics 

  Li, Shi; Wang, Cong; Yin, Yu; Lewis, Elfed; Wang, Pengfei (De Gruyter, 2020)

  A range of new 2D materials have recently been reported, including topological insulators, transition-metal dichalcogenides, black phosphorus, MXenes, and metal-organic frameworks, which have demonstrated high optical ...
• Tellurite glass and its application in lasers 

  Wang, Pengfei; Jia, Shijie; Lu, Xiaosong; Jiang, Yuxuan; Yu, Jibo; Wang, Xin; Wang, Shunbin; Lewis, Elfed (IntechOpen, 2020)

  This chapter provides expert coverage of the physical properties of new noncrystalline solids—tellurite glass and the latest laser applications of the material —offering insights into innovative applications for laser and ...
• A temperature compensated optical fibre bending sensor for physiological measurement 

  Zawawi, Mohd Anwar; O'Keeffe, Sinéad; Lewis, Elfed (International Society for Optics and Photonics, 2014)

  The light attenuation measurement of a plastic optical fibre sensor based on a referenced intensity modulation technique with respect to different input voltage level and room temperature has been investigated. The results ...
• Plastic optical fibre sensor for spine bending monitoring 

  Zawawi, Mohd Anwar; O'Keeffe, Sinéad; Lewis, Elfed (IOP Publishing, 2013)

  This paper presents a study on the application of plastic optical fibre for spine bending monitoring based on an intensity modulation. The bending angle is measured as the angle between the emitting and receiving fibres ...
• The potential for development of an NH3 optical fibre gas sensor 

  Chambers, Paul; Lyons, W.B.; Lewis, Elfed; Sun, Tong; Grattan, Kenneth T.V. (IOP Publishing, 2007)

  This paper describes the potential for the future development of comparatively low cost ultra-violet optical fibre ammonia gas detection systems. The potential for the construction of these systems using low-cost optoelectronic ...
• Sensor system concept for non-invasive blood diagnosis 

  Timm, Ulrich; Lewsi, Elfed; McGrath, D.; Kraitl, J.; Ewald, Hartmut (Elsevier, 2009)

  The Hemoglobin (Hb) concentration in human blood is an important parameter to evaluate the physiological condition. A hemoglobin test reveals how much hemoglobin can be found in the blood. With this information anemia (a ...
• Hazardous gas detection with an integrating sphere in the near infrared 

  Hawe, Eamonn; Lewis, Elfed; Fitzpatrick, Colin (IOP Publishing, 2005)

  This paper describes an optical fibre near infrared Carbon Dioxide sensor. Using an integrating sphere as a test cell, increased path length is achieved due to multiple reflections within the sphere. Carbon dioxide is input ...
• Toward a multipoint optical fibre sensor system for use in process water systems based on artificial neural network pattern recognition. 

  King, D.; Lyons, W.B.; Flannagan, C.; Lewis, Elfed (IOP Publishing, 2005)

  An optical fibre sensor capable of detecting various concentrations of ethanol in water supplies is reported. The sensor is based on a U-bend sensor configuration and is incorporated into a 170-metre length of silica ...
• Blood detection in the spinal column of whole cooked chicken using an optical fibre based sensor system 

  Sheridan, C.; O'Farrell, Marion; Lyons, W.B.; Lewsi, Elfed; Flannagan, C.; Jackman, N. (IOP Publishing, 2005)

  An optical fibre based sensor has been developed to aid the quality assurance of food cooked in industrial ovens by monitoring the product in situ as it cooks. The sensor measures the product colour as it cooks by examining ...
• Online monitoring of exhaust emissions using mid-infrared spectroscopy. 

  Mulrooney, Jim; Clifford, John; Fitzpatrick, Colin (IOP Publishing, 2005)

  Existing automotive sensors do not quantify the levels of pollutants entering the atmosphere; instead they merely indicate that pollution is occurring. However to meet European legislation on emission control, it is necessary ...
• Novel passive fibre-cavity design for ring-down experiments using a multimode optical waveguide 

  Fabian, Matthias; Lewis, Elfed; Newe, Thomas; Lochmann, Steffen (International Society for Optics and Photonics, 2009)

  A novel fibre-cavity design based on highly reflective gold coatings, vapor-deposited to the two end faces of a 400um multimode waveguide, is presented. In contrast to common fibre-cavity approaches, the laser pulses are not ...
• Flow sensor using optical fibre strain gauges 

  Schmitt, Nicolas; Morgan, R.; Scully, Patricia J.; Lewis, Lewis; Chandy, Rekha (The International Society for Optics and Photonics, 1995)

  A novel technique for the measurement of air flow velocity using an optical fibre sensor is reported. The sensor measures the deformation of a rubber cantilever beam when subjected to the stresses induced by drag forces ...

View more