GaN-Based Micro-LED Visible Light Communication: Line-of-Sight VLC with Active Tracking and None-Line-of-Sight VLC Demonstration

abstract: Visible light communication (VLC) is the promise of a high data rate wireless network for both indoor and outdoor uses. It competes with 5G radio frequency (RF) system as well. Even though the breakthrough of Gallium Nitride (GaN) based micro-light-emitting-diodes (micro-LEDs) enhances the -3dB modulation bandwidth dramatically from tens of MHz to hundreds of MHz, the optical power onto a fast photo receiver drops exponentially. It determines the signal to noise ratio (SNR) of VLC. For full implementation of the useful high data-rate VLC link enabled by a GaN-based micro-LED, it needs focusing optics and a tracking system. In this dissertation, we demonstrate a novel active on-chip monitoring system for VLC using a GaN-based micro-LED and none-return-to-zero on-off keying (NRZ-OOK) modulation scheme. By this innovative technique without manual focusing, the field of view (FOV) was enlarged to 120° and data rates up to 600 Mbps at a bit error rate (BER) of 2.1×10⁻⁴ were achieved. This work demonstrates the establishment of a VLC physical link. It shows improved communication quality by orders, making it optimized for real communications. This dissertation also gives an experimental demonstration of non-line-of-sight (NLOS) visible light communication (VLC) using a single 80 μm gallium nitride (GaN) based micro-light-emitting diode (micro-LED). IEEE 802.11ac modulation scheme with 80 MHz bandwidth, as an entry level of the fifth generation of Wi-Fi, was employed to use the micro-LED bandwidth efficiently. These practical techniques were successfully utilized to achieve a demonstration of line-of-sight (LOS) VLC at a speed of 433 Mbps, and a bit error rate (BER) of 10⁻⁵ with a free space transmit distance 3.6 m. Besides this, we demonstrated directed NLOS VLC links based on mirror reflections with a data rate of 433 Mbps and a BER of 10⁻⁴. For non-directed NLOS VLC using a print paper as the reflective material, 195 Mbps data rate and a BER of 10⁻⁵ was achieved.Dissertation/ThesisDoctoral Dissertation Electrical Engineering 201

B.O.G.G.L.E.S.: Boundary Optical GeoGraphic Lidar Environment System

The purpose of this paper is to describe a pseudo X-ray vision system that pairs a Lidar scanner with a visualization device. The system as a whole is referred to as B.O.G.G.L.E.S. There are several key factors that went into the development of this system and the background information and design approach are thoroughly described. B.O.G.G.L.E.S functionality is depicted through the use of design constraints and the analysis of test results. Additionally, many possible developments for B.O.G.G.L.E.S are proposed in the paper. This indicates that there are various avenues of improvement for this project that could be implemented in the future

Lighting Design with LEDs: An investigation of the information that lighting designers require and receive from the LED Supply Chain, and an empirical study on the implications of lighting design with the use of LEDs

Lighting Emitted Diodes (LEDs) are currently being used in advanced lighting designs, mainly in the leisure industry, due to the technological advantages that they offer. Nevertheless, there have been key problems related to the adoption of LEDs in contemporary lighting design schemes. These include the photometry and colorimetry of LEDs, the limited available standards against which to compare and evaluate LEDs, the inadequacy of uniform definitions, and also the lack or inconsistency of data in the LED supply chain. In light of the above, the thesis aims at examining the implications of using LEDs in the illumination of the leisure industry, given the latest technological advancements. To achieve this goal, the thesis defines the Supply Chain of the LED industry. It discusses the flow of information between LED manufacturers, LED module manufacturers, luminaire manufacturers, lighting designers and end users. It analyzes the kind of information that each of these groups expects and receives from the other groups of the Supply Chain, for different kinds of LED applications. The thesis also discusses the importance of data availability to meet different lighting parameters in LED applications. Finally, the thesis notes the necessity for standards that ensure quality, reliable and comparable data. And it also provides guidelines on various issues that need to be taken into account when designing with LEDs. The thesis adds value to the lighting community by addressing issues not covered by previous research. In fact, it puts the whole “puzzle” of the LED lighting industry together by analyzing its different “pieces”: the market of lighting products, lighting design, standards availability, and end user requirements in the leisure industry. The originality of this research is related to the fact that it discloses the flow of information within the lighting industry and the way that the available knowledge is handled and distributed. The novelty of the thesis is also related to the fact that it reveals how information and data availability influence the adoption of LED technology and the decision making in regard to LED products for different kinds of applications. Through that, the thesis contributes to the lighting community by setting the importance of ‘quality’ lighting parameters when designing with LEDs, and by developing guidelines on how to handle the very fast changing technology of LEDs

Remote Operated Probe for Deep-water Cave Exploration

Předkládaná práce se zabývá návrhem a konstrukcí dálkově řízené sondy pro průzkum zatopených krasových oblastí. Cílem práce je zhotovení cenově přijatelné sondy pro speleologický výzkum. Soustava senzorů a dálkově řízený kamerový systém umožňuje pořízení záběrů z velkých hloubek, které lze později analyzovat.The diploma thesis is focused on remote-controlled probe design and realization for cave exploration. The main aim is to build price-affordable probe for speleology purposes. Sensor system and remote-controlled camera system enable to provide video scenes from large depth that can be analyzed in detail.

Hydromodus: An Autonomous Underwater Vehicle

Hydromodus is a student-led multidisciplinary project conceived by Jordan Read designed to provide a low-cost modular hardware and software solution for researchers and scientists. For the scope of the Senior Project class, it is designed to be a baited remote underwater vehicle (BRUV), but the platform is highly modifiable and open-source

Revision of the EU Green Public Procurement Criteria for Street Lighting and Traffic Signals - Preliminary Report

Lighting is used on more than 1.6 million km of roads in EU28 countries, accounting for some 35 TWh of electricity consumption (1.3% of total electricity consumption) and costing public authorities almost €4000 million each year. A broad review of relevant technical, policy, academic and legislative literature has been conducted. This report examines the current market situation and the potential for reducing environmental impacts and electricity costs by assessing the recent developments in road lighting technology, particularly LEDs. Particularly important areas identified relate to energy efficiency, light pollution, product durability and, specifically for longer lasting and rapidly evolving new LED technologies, reparability and upgradeability. The information in this report shall serve as a basis for discussion with stakeholders about the further development and revision of EU GPP criteria for street lighting and traffic signals.JRC.B.5-Circular Economy and Industrial Leadershi

Development of PCI Embedded Card Useful for Microcontroller Trainer

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Current Status And Prospects For Lighting Technologies In Senior Living Facilities

This case study of five senior living facilities in Northwestern North Carolina explains the current lighting scenarios commonly found in assisted living and skilled nursing long-term healthcare communities. The study argues existing lighting conditions in the indoor environments ordinarily found in these facilities–activity rooms, dining rooms, hallways, residents’ rooms, and bathrooms–do not meet current recommended lighting standards. Many qualitative benefits such as health and well-being relate to the technical qualities of artificial lighting including, but not limited to, the following: illuminance, color temperature, luminance, and value contrast. Current technologies–for example, BIOS technology and tunable white light–can help with elderly vision and circadian rhythm simulation. Additionally, with the advancement of LED technology, there are economic considerations for switching to a new lighting design. An extended examination of one of the five case study facilities substantiates that a retrofit LED lighting design will bring about annual energy cost savings and a short payback time as shown by a calculation of the return on investment