scholarly journals HCL Control Strategy for an Adaptive Roadway Lighting Distribution

2021 ◽  
Vol 11 (21) ◽  
pp. 9960
Author(s):  
Chun-Hsi Liu ◽  
Chun-Yu Hsiao ◽  
Jyh-Cherng Gu ◽  
Kuan-Yi Liu ◽  
Shu-Fen Yan ◽  
...  
Keyword(s):  
Image Data ◽  
Calculation Model ◽  
Flux Analysis ◽  
Optical Components ◽  
Road Lighting ◽  
Road Users ◽  
Road Surfaces ◽  
Roadway Lighting ◽  
And Control ◽  
Led Lights

This study aims to develop a human-centric, intelligent lighting control system using adaptive LED lights in roadway lighting, integrated with an imaging luminance meter that uses an IoT sensor driver to detect the brightness of road surfaces. AI image data are collected for luminance and vehicle conditions analyses to adjust the output of the photometric curve. Type-A lenses are designed for R3 dry roads, while Type-B lenses are designed for W1 wet roads, to solve hazards caused by slippery roads, for optimizing safety and for visual clarity for road users. Data are collected for establishing formulae to optimize road lighting. First, the research uses zonal flux analysis to design secondary optical components of LED roadway lighting. Based on the distribution of LED lights and the target photometric curve, the freeform surface calculation model and formula are established, and control points of each curved surface are calculated using an iterative method. The reflection coefficient of a roadway is used to design optical lenses that take into account the illuminance and luminance uniformity to produce photometric curves accordingly. This system monitors roadway luminance in real time, which simulates drivers’ visual experiences and uses the ZigBee protocol to transmit control commands. This optimizes the output of light according to weather and produces quality roadway lighting, providing a safer driving environment.

INFLUENCE OF ROAD SURFACES ON THE CALCULATION OF A TARGET VISIBILITY TAKING INTO ACCOUNT THE DIRECT AND INDIRECT LIGHTING

2021 ◽  
Author(s):  
L. Lebouc ◽  
V. Boucher ◽  
F. Greffier ◽  
S. Liandrat ◽  
A. Nicolaï ◽  
...  
Keyword(s):  
Road Surface ◽  
Street Lighting ◽  
Target Luminance ◽  
The Road ◽  
Road Lighting ◽  
Road Users ◽  
Road Surfaces ◽  
Indirect Lighting ◽  
On The Road ◽  
Target Visibility

Street lighting ensures visibility and legibility for road users. In this paper, performances of the lighting installation of four road sections with different type of road surface are simulated in accordance with guidelines and road lighting standards. Then, the calculation of the visibility level of a target according to the Adrian’s model is included. Next, the light reflections on the road surface are added to the calculation of the target luminance. For this, the area considered in front of the target as well as the number of elementary surfaces are fixed and a Q_0-scaling of the r-table obtained for α=45° is performed. We compare the results obtained for each section with and without considering the light reflections and conclude that there is negligible incidence of the nature of the road surface on the target luminance. However, an effect of the road surface on the visibility level of the target is observed.

scholarly journals Review of road surface photometry methods and devices – Proposal for new measurement geometries

2020 ◽  
pp. 147715352095845
Author(s):  
V Muzet ◽  
J Bernasconi ◽  
P Iacomussi ◽  
S Liandrat ◽  
F Greffier ◽  
...  
Keyword(s):  
Lighting Design ◽  
Urban Environments ◽  
Viewing Distance ◽  
Surface Photometry ◽  
Observation Distance ◽  
Road Lighting ◽  
Road Users ◽  
Measuring Devices ◽  
Road Surfaces ◽  
Road Marking

Specifications concerning road lighting and photometry of road surfaces were established more than 50 years ago. Road lighting design and road marking visibility were developed for vehicle driving. The observation distance defined by standards corresponds to interurban applications; however, within Europe these areas do not tend to be lit. The objective of the SURFACE project is to propose new geometries for the photometric characterisation of pavements, both adapted to different urban travel modes and new lighting technologies. This article reviews the available guidelines, standards, measuring devices and literature regarding geometries and road lighting applications, and presents the project SURFACE analysis and proposal. The SURFACE consortium recommends adding several new angles for different driving conditions and road users; 2.29° for urban environments and consistency with road marking standard, and 1° for extra-urban environment and consistency with previous geometries. A 5° angle, corresponding to 17-m viewing distance, could be an interesting compromise, suitable for urban driving at low speed, cycling and for scooters. The angles of 10° and 20° are under consideration for describing the boundary between diffuse and specular behaviour.

scholarly journals Titanium-Based Microbolometers: Control of Spatial Profile of Terahertz Emission in Weak Power Sources

2020 ◽  
Vol 10 (10) ◽  
pp. 3400
Author(s):  
Linas Minkevičius ◽  
Liang Qi ◽  
Agnieszka Siemion ◽  
Domas Jokubauskis ◽  
Aleksander Sešek ◽  
...  
Keyword(s):  
Imaging Techniques ◽  
Dark Field ◽  
Spatial Mode ◽  
Contrast Imaging ◽  
Optical Components ◽  
Broadband Antenna ◽  
Power Sources ◽  
Precise Control ◽  
Imaging And Spectroscopy ◽  
And Control

Terahertz (THz) imaging and spectroscopy set-ups require fine optical alignment or precise control of spatial mode profile. We demonstrate universal, convenient and easy-to-use imaging—resonant and broadband antenna coupled ultrasensitive titanium-based—dedicated to accurately adjust and control spatial mode profiles without additional focusing optical components of weak power THz sources. Versatile operation of the devices is shown using different kinds of THz—electronic multiplier sources, optical THz mixer-based frequency domain and femtosecond optoelectronic THz time-domain spectrometers as well as optically pumped molecular THz laser. Features of the microbolometers within 0.15–0.6 THz range are exposed and discussed, their ability to detect spatial mode profiles beyond the antennas resonances, up to 2.52 THz, are explored. Polarization-sensitive mode control possibilities are examined in details. The suitability of the resonant antenna-coupled microbolometers to resolve low-absorbing objects at 0.3 THz is revealed via direct, dark field and phase contrast imaging techniques as well.

OPTIMISING ROAD LIGHTING TO REDUCE ROAD TRAFFIC CRASHES

2021 ◽  
Author(s):  
C.J. Robbins ◽  
S. Fotios ◽  
J. Uttley ◽  
R. Rowe
Keyword(s):  
High Speed ◽  
Road Traffic ◽  
Cost Benefit ◽  
Light Level ◽  
Traffic Crashes ◽  
Road Traffic Crashes ◽  
Road Lighting ◽  
Road Users ◽  
Ambient Light Level ◽  
Vulnerable Road Users

Pedestrians and motorcyclists are vulnerable road users, being over represented in road traffic collisions (RTCs). One assumed benefit of road lighting is a reduction in RTCs after dark by countering the impairment to the visual detection of hazards that occur after dark. One way to optimise the use of road lighting is to light only those sections of road where light level, and hence visibility, is an important factor. The current study used change in ambient light level on RTCs to investigate those situations where improved vision is likely to have significant impact, and therefore the situations where road lighting is of better cost-benefit effectiveness. For both motorcyclist and pedestrian RTCs there was a significant increase in overall RTC risk in darkness compared to daylight, indicating that there may be an overall benefit of road lighting. While darkness was a particular detriment at junctions for motorcyclists and on high-speed roads for pedestrians, road lighting may not be effective mitigation in either case and therefore alternative ways of increasing conspicuity should be considered.

scholarly journals Integrated Optics in Astronomical Interferometry

1994 ◽  
Vol 158 ◽  
pp. 261-271 ◽  
Author(s):  
V. Coudé du Foresto
Keyword(s):  
Integrated Optics ◽  
Single Mode ◽  
Spatial Filtering ◽  
Coherent Beam ◽  
Optical Components ◽  
Polarization Behavior ◽  
Integrated Optical ◽  
Fringe Tracking ◽  
And Control

Integrated optical components (mostly single-mode fibers and couplers) can be used to achieve several functions that are needed in interferometry: coherent beam transportation and recombination, pathlength modulation and control for fringe tracking and double Fourier interferometry, spatial filtering of the wavefront and interferogram calibration. Their potential is assessed and the main problems encountered in their implementation are discussed: dispersion, polarization behavior, and especially starlight injection.

Modeling, Design and Control of Zeta Converter for Dimmable LED Lights

2020 ◽  
Author(s):  
Shyam Sunder Sharma ◽  
Shailendra K. Sharma ◽  
Rakesh Saxena
Keyword(s):  
And Control ◽  
Led Lights

A new procedure for determining the road surface reduced luminance coefficient table by on-site measurements

2018 ◽  
Vol 51 (1) ◽  
pp. 65-81 ◽  
Author(s):  
N Strbac-Hadzibegovic ◽  
S Strbac-Savic ◽  
M Kostic
Keyword(s):  
Road Surface ◽  
Surface Reflection ◽  
The Road ◽  
Road Lighting ◽  
Average Luminance ◽  
Road Surfaces ◽  
Q Values

Numerous measurements have shown that the standard R classes do not represent adequately many road surfaces used nowadays. Therefore, the construction of portable reflectometers intended for on-site measurements of road surface reflection properties has been given particular attention during the last decade. This paper presents a new procedure for the improvement of the accuracy of such a portable reflectometer. Optimally extrapolating the values of the 20 luminance coefficients (q), each measured by the portable reflectometer for a set of angles of observation (α = 5°–80°), the 20 q-values referring to α = 1° are calculated. This enables their comparison with the corresponding q elements from each of the 447 reduced q-tables derived from the available r-table database, obtained by using a precise laboratory reflectometer on a wide variety of road samples. Selecting the closest reduced q-table, the corresponding r-table and the actual average luminance coefficient can be determined. In order to validate the proposed procedure, which can also be applied to other similar portable reflectometers, measurements of the luminance and overall and longitudinal luminance uniformities were carried out on eleven road-lighting installations. They showed that the results obtained by this procedure deviate only slightly from those obtained using r-tables determined by the laboratory reflectometer.

Research on a Calculation Model and Control Measures for Carbon Emission of Buildings

ICCREM 2018 ◽  
2018 ◽  
Author(s):  
Juanjuan Shen ◽  
Xiuqin Yin ◽  
Quan Zhou
Keyword(s):  
Carbon Emission ◽  
Calculation Model ◽  
Control Measures ◽  
And Control

MTSAT Image Data Acquisition and Control System

2004 ◽  
Author(s):  
J. Barton ◽  
J. Bass ◽  
M Milnes
Keyword(s):  
Control System ◽  
Data Acquisition ◽  
Image Data ◽  
And Control

Adaptive Control Research and Design Based on STC Single-Chip Microcomputer

2012 ◽  
Vol 516-517 ◽  
pp. 1678-1682
Author(s):  
Qiang Xu ◽  
Qian Zhang ◽  
Kai Chun Ren ◽  
Xing Qi Zhang ◽  
Shi Gang Li
Keyword(s):  
Software Design ◽  
Lighting System ◽  
Single Chip ◽  
Single Chip Microcomputer ◽  
Control Module ◽  
Control Research ◽  
Data Acquisition Module ◽  
And Control ◽  
Led Lights ◽  
Research And Design

This paper analyses the characteristics and the glowing use value of LED lights, using STC series microcontroller design a system of LED which can automatically adjust the light according to the environment changes. The control system consists by the data acquisition module and control module and circuit driver module. This paper gives the control circuit hardware and software design. This system has many advantages such as energy conservation and environmental protection and longevity when compared with the conventional lighting system.

Sign in / Sign up

Export Citation Format

Share Document