345 research outputs found
Towards a solidâstate light detection and ranging system using holographic illumination and timeâofâflight image sensing
Understanding the Impact of Technology: Learner and School Level Factors
The first part of this report focuses on the factors impacting on learner performance in national tests at primary and secondary level. This was the central research question of this research.
The second section focuses on teacher and learner perceptions of their own responses to learning and the learning environment. This was centred on, but not confined to, their school.
The institutional structures record the level of development of the schools sampled here and investigate the use of two key technologies â interactive whiteboards and learning platform
Volumetric 3D display in real space using a diffractive lens, fast projector, and polychromatic light source
Spatiotemporal Electrochemical Sensing in a Smart Contact Lens
An electrochemical smart contact lens (ESCL) capable of real-speed spatiotemporal electrochemical sensing
across the surface of the eye is demonstrated. Four microelectrode arrays, each comprising 33 gold microdiscs of
30 ÎŒm diameter, and a distributed common gold counter electrode, are integrated into a soft smart contact lens
platform based on polyimide and thermoplastic polyurethane. Using a novel fast-switching chronoamperometric
method, an electrochemical âvideoâ of concentration variation in a model eye under ïŹow conditions is produced,
in which the introduction, progress, mixing and drainage of ïŹuid of varying concentration can be observed. The
device builds on previous work towards a platform suitable for clinical use and has proven to be robust under
expected use conditions, with sensing performance remaining unchanged after thermoforming and repeated
mechanical deformation. This work represents a signiïŹcant step forward in ESCL design, and constitutes sig-
niïŹcant progress towards a technology with real clinical utility
A Novel Contactless Technique to Measure Water Waves Using a Single Photon Avalanche Diode Detector Array
Commonly deployed measurement systems for water waves are intrusive and measure a limited number of parameters. This results in difficulties in inferring detailed sea state information while additionally subjecting the system to environmental loading. Optical techniques offer a non-intrusive alternative, yet documented systems suffer a range of problems related to usability and performance. Here, we present experimental data obtained from a 256âĂâ256 Single Photon Avalanche Diode (SPAD) detector array used to measure water waves in a laboratory facility. 12 regular wave conditions are used to assess performance. Picosecond resolution time-of-flight measurements are obtained, without the use of dye, over an area of the water surface and processed to provide surface elevation data. The SPAD detector array is installed 0.487âm above the water surface and synchronized with a pulsed laser source with a wavelength of 532ânm and mean power <1âmW. Through analysis of the experimental results, and with the aid of an optical model, we demonstrate good performance up to a limiting steepness value, ka, of 0.11. Through this preliminary proof-of-concept study, we highlight the capability for SPAD-based systems to measure water waves within a given field-of-view simultaneously, while raising potential solutions for improving performance
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