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Why fog lamps use yellow instead of eye-catching red!

by:DLAA      2020-08-26
What is yellow fog lamps use? Because the human eye is sensitive to the yellow green. In fact the color of the automobile lamps and lanterns chooses with scattering factors, because in the case of the fog, the degree of mie scattering has nothing to do with the wavelength of incident light. Low to the human eye is sensitive to what color of the light car install lamps and lanterns is to alert, so need to find out the human eye is sensitive to what color of the light, so that makes sense. The optic nerve to the sensitivity of different wavelengths of light is not the same, the most sensitive to green light, and lowest in red and blue light sensitivity. International lighting board ( CIE) Determined according to experimental results, the relative sensitivity of the human eye to different wavelength of light, known as 'spectral luminous efficiency or visibility function'. In bright situation, the brightness is more than 3 CD/m2, the human eye is sensitive to wavelengths, the spectral luminous efficiency peak value corresponding to the wavelength at 555 nm, belong to the yellow green. In the dark depending on the circumstances, the brightness is less than 0. 001 CD/m2, the human eye is sensitive wavelength at 507 nm. Yellow wavelengths: 540 ~ 600 nm, green wavelengths: 495 nm to 540 nm, cyan: 460 ~ 495 nm. The fog lamps with yellow light, it is very reasonable. Then why brake light USES the red light? That is the meaning of red danger to humans, but human eye on its sensitivity is not high. In low light medium propagation attenuation associated with what factors of light in air, with a variety of gas molecules in the atmosphere, such as dust, smoke, moisture and make part of the radiation energy is absorbed and converted, by scattering and so on. At that time, we are concerned about the light penetration problem, this involves atmospheric molecular absorption and scattering of light. Low light of atmospheric molecules absorb light at atmospheric propagation, atmospheric molecules in polarized light waves under the action of electric field, and do forced vibration with the frequency of the incident light, light molecules in the atmosphere is to overcome internal resistance and energy consumption, characterized by atmospheric absorption. Composition of atmospheric atoms molecules there are nitrogen, oxygen, carbon dioxide, hydrogen, water, etc. , including nitrogen and oxygen content is the most, but they almost do not absorb to visible light. In fact, water and carbon dioxide molecules, water molecules in the visible light region in particular had a broad the vibration of the structure, so it is the most important optical absorption of molecular, is the main factor of atmospheric optical attenuation. When the frequency of the incident light is equal to the atmospheric molecular inherent frequency, the resonance absorption occurs, then HouGuang attenuation peak. In fact, there are a few other molecules, such as helium, ozone in near infrared region of the visible light has considerable absorption effect, but the content of the atmosphere effect, generally do not consider its absorption. This explains the fog, the light penetration weakened sharply, because the light is absorbed by water molecules. Of atmospheric molecular light scattering sunny air quality good, because the atmosphere such as nitrogen, oxygen, carbon dioxide molecular size is far less than the wavelength of visible light, so the main consideration Rayleigh scattering, the attenuation coefficient with molecular density is proportional to the, four inverse proportion with wavelength, the longer the visible wavelength scattering the weaker. With dust, sand, rain, snow, fog, haze, due to the particle size are usually the wavelength of light, so the main consideration mie scattering. Mie scattering associated with particle size, density and refractive index characteristics, has nothing to do with the wavelength of light. Why low fog lamps with yellow light? Because the human eye is sensitive to the yellow green. In fact the color of the automobile lamps and lanterns chooses with scattering factors, because in the case of the fog, the degree of mie scattering has nothing to do with the wavelength of incident light. Haze in clear weather, the occurrence of Rayleigh scattering associated with the wavelength of incident light, the more the longer wavelength scattering is weak, so, longer wavelength than red light yellow light, more is not easy to scatter, red light penetration is better. Now cars, generally equipped with front and rear fog lamps, front fog lamp is yellow or white, after the fog light is red. It was her turn signal that was pure yellow. Now popular day LED running lights are white, and not deliberately make it yellow or red, so you still don't need to read too much into the meaning of the color of lamps and lanterns.
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