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Study: adverse weather conditions, LED's through the fog of by wgverbv dfbdfb
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Study: adverse weather conditions, LED's through the fog of |
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Business,Business News,Business Opportunities
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1. Introduction
Visible in the snow, rain and fog through the ability to decrease the time, so that bad weather caused a great threat to traffic safety. Visible in the snow, rain and droplet spread, due to scattering and absorption effects, so that visibility is very much affected. Some research studies have been done, and gives some visible light in the propagation of these severe weather conditions, the characteristics and conclusions.
For visible light transmission in an environment of fog, Bobsy Arief KURNIAWAN [1] measured at different concentrations and droplet size fog conditions, the human eye's response to the LED brightness. He uses four colors red, yellow, blue and green light, and their color between two colors each, constitute the 12 kinds of colors of light experiments, and got red, yellow, red and blue light through the fog to maximize the brightness. Meanwhile, the Blu-ray visibility in thick fog in the worst. Rain and snow in the environment, most research focused on the choice of yellow and white. People often think that yellow better than white, because the same brightness in the yellow glare caused no serious white. This common-sense understanding is John D. Bullough 's research confirms. He obtained the same intensity, the yellow light than in white light by the impact of backscatter is small, so small glare conclusions [2,3].
As a visible light transmission in adverse weather conditions characteristic of a preliminary study, the main concern in this article Experimental transmission of visible light in the fog situation. Experiment with different Bobsy Arief KURNIAWAN, the present study, four single-color LED as the light source, which means avoiding Bobsy may appear the phenomenon of metamerism. Experimental use of humidifier produces fog, surveying the four monochromatic LED fog concentrations at different illumination attenuation. Fog of concentration from a concentration of white LED illumination in the corresponding attenuation values to describe. Decay curves obtained by illumination with the best ability of monochromatic visible light through the fog. In this study, from the quantitative point of view of a monochromatic visible light transmission properties of the fog. Experimental results on the choice of lighting equipment with some guidance.
2. Experimental methods
2.1 Experimental device
Fig. 1 System setup of the experiment in side view
Shown in Figure 1, a light source, four color LED are 1W; 2 as the fog box, long 30cm, width 37cm, high 32cm, the inner surface blackened; 3 for the humidifier, produced by 22 different stalls degree of fog; 4 for the connecting pipe, to produce the fog humidifier mist box access; 5 for the probe, facing the light source; 6 as according to meters, to collect illumination value.
2.2 Experimental conditions
In order to prevent outside light on the impact of experimental results, the experiment carried out in the darkroom. Meanwhile, the laboratory's windows and doors are closed to prevent the interference of outside air to the experiment. Laboratory to maintain constant temperature 25 .
The most important part of the experiment is conducted in the laboratory simulation of the fog. As the experiment is a mist demand uniformity, stability, and can more easily adjust the concentration, so the experiment could not fog in the outdoors must be made in the laboratory of artificial fog. Experiment with water mist humidifier exhaled air to simulate the nature of the fog. Most of the droplet sampling method was the fog that exist in nature, the particle diameter range of 4 ~ 10 m. The use of centrifugal humidifier, diameter can be played 5 m [4] of the fine mist, just a natural fog particles in the size range. In addition, the use of centrifugal humidifier, avoid playing the high-temperature steam mist humidifier may be the impact of the control meter probe.
Through the spectrometer collected by laboratories in four color LED of the characteristic parameters of the peak wavelength and half-wave width, the following order: red LED ( p = 625nm, FWHM = 50nm), the yellow LED ( p = 594nm, FWHM = 13nm), green LED ( p = 514nm, FWHM = 45nm), the blue LED ( p = 459nm, FWHM = 22nm). Fog experiments in different concentrations by measuring the color of the illumination LED.
2.3 experiment
This experiment humidifier six stalls (0 files, 10 stalls, 12 stalls, 14 stalls, 16 stalls and 18 stalls) have different concentrations of mist, fog concentration increased with the rise stalls.
First, under the conditions without fog light red LED, through the meter according to the value measured at this time as the initial intensity of illumination. Under a particular gear, open the humidifier for two minutes. Close humidifier 10 seconds, through the fog of fog in the box is basically uniform, the measured value at this time as the red LED illumination at this concentration of through illumination. Illumination by illumination ratio shall be the initial transmission. Wait, when the fog dispersed through the fog after box, change the humidifier stalls and repeat the above experiment. Each color LED is repeat the process. Taking the average of three experiments as the final result. I am China Agriculture Net writer, reports some information about rack filler panels , ultra320 scsi cable.
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