ESTIMATION OF COMPLEX LIGHT DISTRIBUTION CHRACTERISTIC BASED ON LIGHT FIELDS

2021 ◽  
Author(s):  
T. Tamura ◽  
M. Ohno ◽  
Y. Nakazato ◽  
K. Hirai
Keyword(s):  
Light Intensity ◽  
Light Source ◽  
Conventional Method ◽  
Measurement Method ◽  
Light Distribution ◽  
Light Fields ◽  
Distribution Characteristic ◽  
Large Space ◽  
Distribution Measurement ◽  
Led Lights

With the advent of LED lights and the added functionality of the lights themselves, the number of automobile headlights being manufactured is rising. Manufactured headlights need to be measured for light distribution characteristic to assure their quality. However, the conventional method requires a lot of measurement time and a large space. As a result, problems arise where light distribution measurement cannot be completed in time for headlight production. We propose a measurement method for complex light distribution characteristic based on light fields to solve this problem. Our method is to measure the light intensity of planes at a certain range distance from the light source and then estimate the light distribution characteristic of a light source. This method would enable the measurement of the light distribution characteristic in a narrower range and in a shorter time than the conventional method.

scholarly journals FISH BEHAVIOR ON FISHERIES BOAT LIFT NET (BAGAN PETEPETE) BY USING LED LIGHTS

2015 ◽  
Vol 7 (1) ◽  
Author(s):  
Muhammad Sulaiman ◽  
Mulyono Sumitro Baskoro ◽  
Am Azbas Taurusman ◽  
Sugeng Hari Wisudo ◽  
Roza Yusfiandayani
Keyword(s):  
Light Intensity ◽  
Water Depth ◽  
Fish Behavior ◽  
Light Distribution ◽  
Side Scan Sonar ◽  
Led Light ◽  
South Sulawesi ◽  
Led Lights

Research on fish behavior in boat lift net fisheries (bagan petepete) equipped with LED light is very important since the similar research is very limited conducted in Indonesian waters. The purpose of this study was to understand the LED light distribution and its impact on the fish behavior around the LED light.  This study was conducted in the laboratory of Simulation Workshop and Navigation, Pangkep State Polytechnique of Agricultural and fishing experiment was done in Barru District waters, Makassar Strait, South Sulawesi. The light intensity was measured by a digital lux meter and under water lux meter, while fish behavior was observed by side scan sonar color. Light intensity analyses showed that the distribution of 80 watts LED light was mostly focused with 1096 lux with an angle168°. Fishes approached the light at 5-10 m and 20-30 m water depth from all directions after all lights were turned on. Fishes in smaller groups and higher density concentrated around the light when only one lamp was turned on. After catch processing, some fishes left the lighting area and others still stayed in the lighting area. Keywords: fish behavior, LED lamp, light fishing, lift net

Rapid Measurement and Simulation of Light Distribution Characteristic of Infrared Thermal Radiation Light Source

2021 ◽  
Vol 41 (2) ◽  
pp. 0212003
Author(s):  
邱乙耕 Qiu Yigeng ◽  
范元媛 Fan Yuanyuan ◽  
王倩 Wang Qian ◽  
颜博霞 Yan Boxia ◽  
王延伟 Wang Yanwei ◽  
...  
Keyword(s):  
Thermal Radiation ◽  
Light Source ◽  
Light Distribution ◽  
Distribution Characteristic ◽  
Rapid Measurement

Inter-Method Reliability of Pulse Volume Related Measures Derived Using Finger-Photoplethysmography

2018 ◽  
Vol 32 (4) ◽  
pp. 182-190 ◽  
Author(s):  
Kenta Matsumura ◽  
Koichi Shimizu ◽  
Peter Rolfe ◽  
Masanori Kakimoto ◽  
Takehiro Yamakoshi
Keyword(s):  
Light Intensity ◽  
Adverse Effects ◽  
Light Source ◽  
Direct Current ◽  
Resting State ◽  
Current Component ◽  
Psychophysiological Measures ◽  
Pulse Volume ◽  
Optical Paths ◽  
Sensor Positions

Abstract. Pulse volume (PV) and its related measures, such as modified normalized pulse volume (mNPV), direct-current component (DC), and pulse rate (PR), derived from the finger-photoplethysmogram (FPPG), are useful psychophysiological measures. Although considerable uncertainties exist in finger-photoplethysmography, little is known about the extent of the adverse effects on the measures. In this study, we therefore examined the inter-method reliability of each index across sensor positions and light intensities, which are major disturbance factors of FPPG. From the tips of the index fingers of 12 participants in a resting state, three simultaneous FPPGs having overlapping optical paths were recorded, with their light intensity being changed in three steps. The analysis revealed that the minimum values of three coefficients of Cronbach’s α for ln PV, ln mNPV, ln DC, and PR across positions were .948, .850, .922, and 1.000, respectively, and that those across intensities were .774, .985, .485, and .998, respectively. These findings suggest that ln mNPV and PR can be used for psychophysiological studies irrespective of minor differences in sensor attachment positions and light source intensity, whereas and ln DC can also be used for such studies but under the condition of light intensity being fixed.

scholarly journals Analysis on High-Power Seaport LED Luminaire with Uniform Light Distribution Based on Optimized Lens and Heatsink

2021 ◽  
Vol 11 (9) ◽  
pp. 4035
Author(s):  
Jinsheon Kim ◽  
Jeungmo Kang ◽  
Woojin Jang
Keyword(s):  
Light Source ◽  
High Power ◽  
Heat Dissipation ◽  
Light Emitting Diode ◽  
Light Distribution ◽  
Light Sources ◽  
Led Light ◽  
High Power Led ◽  
Distribution Requirement ◽  
Lighting Application

In the case of light-emitting diode (LED) seaport luminaires, they should be designed in consideration of glare, average illuminance, and overall uniformity. Although it is possible to implement light distribution through auxiliary devices such as reflectors, it means increasing the weight and size of the luminaire, which reduces the feasibility. Considering the special environment of seaport luminaires, which are installed at a height of 30 m or more, it is necessary to reduce the weight of the device, facilitate replacement, and secure a light source with a long life. In this paper, an optimized lens design was investigated to provide uniform light distribution to meet the requirement in the seaport lighting application. Four types of lens were designed and fabricated to verify the uniform light distribution requirement for the seaport lighting application. Using numerical analysis, we optimized the lens that provides the required minimum overall uniformity for the seaport lighting application. A theoretical analysis for the heatsink structure and shape were conducted to reduce the heat from the high-power LED light sources up to 250 W. As a result of these analyses on the heat dissipation characteristics of the high-power LED light source used in the LED seaport luminaire, the heatsink with hexagonal-shape fins shows the best heat dissipation effect. Finally, a prototype LED seaport luminaire with an optimized lens and heat sink was fabricated and tested in a real seaport environment. The light distribution characteristics of this prototype LED seaport luminaire were compared with a commercial high-pressure sodium luminaire and metal halide luminaire.

scholarly journals Cyanobacteria use micro-optics to sense light direction

eLife ◽  
2016 ◽  
Vol 5 ◽  
Author(s):  
Nils Schuergers ◽  
Tchern Lenn ◽  
Ronald Kampmann ◽  
Markus V Meissner ◽  
Tiago Esteves ◽  
...  
Keyword(s):  
Light Intensity ◽  
Light Source ◽  
Type Iv Pili ◽  
Small Cells ◽  
Unicellular Cyanobacterium ◽  
Light Sensing ◽  
High Resolution Image ◽  
Type Iv ◽  
Micro Optics ◽  
Synechocystis Sp

Bacterial phototaxis was first recognized over a century ago, but the method by which such small cells can sense the direction of illumination has remained puzzling. The unicellular cyanobacterium Synechocystis sp. PCC 6803 moves with Type IV pili and measures light intensity and color with a range of photoreceptors. Here, we show that individual Synechocystis cells do not respond to a spatiotemporal gradient in light intensity, but rather they directly and accurately sense the position of a light source. We show that directional light sensing is possible because Synechocystis cells act as spherical microlenses, allowing the cell to see a light source and move towards it. A high-resolution image of the light source is focused on the edge of the cell opposite to the source, triggering movement away from the focused spot. Spherical cyanobacteria are probably the world’s smallest and oldest example of a camera eye.

scholarly journals Elimination of the blinding effect in landscape luminaires

2018 ◽  
Vol 7 (2.13) ◽  
pp. 252
Author(s):  
Albert Ashryatov ◽  
Dinara Churakova
Keyword(s):  
Light Curve ◽  
Light Source ◽  
Light Flux ◽  
Light Distribution ◽  
Light Sources ◽  
Mirror Surface ◽  
Light Emitting ◽  
Lighting Technology ◽  
Initial Task ◽  
Flat Beam

The article presents one of the possible options for implementing the lighting technology "Flat beam" for landscape lighting purposes. One of the possible ways to control the light distribution of a number of light sources based on LEDs with different radiation patterns is considered. As a secondary optics, it is proposed to use a mirror surface that redistributes the light flux of an LED light source. It is indicated that, depending on the initial type of the light-emitting diodes light curve and the features of mounting the mirror surface, the resulting light distribution can vary widely, depending on the initial task that the designer sets for himself.  

scholarly journals The Effects of Day Length and Light Intensity on Tile Growth of Barley

1969 ◽  
Vol 22 (1) ◽  
pp. 53 ◽  
Author(s):  
D Aspinall
Keyword(s):  
Light Intensity ◽  
Linear Relationship ◽  
Light Source ◽  
Blue Light ◽  
Floral Development ◽  
Red Light ◽  
Day Length

The acceleration of flowering in barley due to the inclusion of incandescent illumination in the light source has been shown to be due to the far�red content of the light. A linear relationship between floral development and intensity of far�red light in a 16�hr photoperiod has been established with the cultivar CI5611. Barley appears to be relatively unresponsive to blue light, however.

ILLUMINANCE DISTRIBUTION MEASUREMENT OF MUSEUM EXHIBITS USING DIGITAL IMAGING LUMINANCE METER

2021 ◽  
Author(s):  
A.A. Bartsev ◽  
A.A. Bartseva
Keyword(s):  
Digital Imaging ◽  
Measurement Method ◽  
Vertical Plane ◽  
Uncertainty Estimation ◽  
Experimental Uncertainty ◽  
Distribution Measurement ◽  
Museum Exhibits ◽  
Luminance Distribution ◽  
Museum Objects

The method for estimating the illuminance distribution in the vertical plane of museum objects (paintings) using a digital imaging luminance meters (ILMD) is considered. In order to pass from the luminance distribution to the illuminance distribution, a screen with reflective properties close to diffuse (Lambert) reflection is used. The theoretical and experimental uncertainty estimation of the measurement method done.

A Centimeter Resolution GIS Insulator Strain Distribution Measurement Method Based on OFDR

2019 ◽  
Vol 19 (8) ◽  
pp. 2962-2969 ◽  
Author(s):  
Guoming Ma ◽  
Weiqi Qin ◽  
Yue Du ◽  
Hongyang Zhou ◽  
Yabo Li ◽  
...  
Keyword(s):  
Strain Distribution ◽  
Measurement Method ◽  
Distribution Measurement
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