Philips Optical Fiber Lighting System Introduction Philips Lighting China Lighting Division Optical Fiber Lighting Overview The phenomenon of light transmitted through multiple total reflections in transparent cylinders has long been familiar. It is said that ancient glass blowers observed this. A phenomenon.
The phenomenon was first scientifically described by the Royal Society of England.
At that time, a vessel filled with water was illuminated, and as the water flowed out of the hole in the bottle side, the light was transmitted along with the water.
However, it was not until nearly sixty years later that someone tried to use this phenomenon scientifically.
In the United States, the United States obtained a patent for fiber optics in the television field. He scanned and transmitted an image using optical fiber, but no one has continued this research.
In the following thirty years, people are working to improve the quality of the medium. The name of the fiber is first proposed in the year.
In the early 1970s, the emergence of low-loss fibers marked a major breakthrough in this area.
Most importantly, the fiber began to enter the information system, which was more economical than the coaxial cable line, microwave communication and waveguide at the time.
In the 1980s, the first optical fiber detection devices, the endoscopes, began to be used in industrial scientific research and the medical and health industries.
At the same time, the optical fiber is also used in other occasions where the need for fine illumination is highly demanding, such as surgery and special functions, such as in dental applications, where the fiber is used in applications requiring a large number of point sources, such as Further research has been carried out on the application of optical fiber in the automotive industry in the factory report and the matrix arrangement panel diagram of traffic lights.
Here, light is produced from a central source, through a fiber optic network arranged like a cable, directed to the desired location, or used for illumination, or with a few indications.
Of particular interest is the recent trend in fiber optic lighting to replace traditional lighting in a variety of everyday indoor and outdoor projects.
At first, in indoor lighting, the fiber was limited to a few decorative effects, such as the starry sky on the ceiling. However, fiber optics has recently been used to display lighting, such as display cases in museum stores.
In outdoor lighting, the side-emitting fiber can be used for visually guided lighting and creative decorative effects on the contoured roads of buildings in public lighting areas.
Viewed from the outside, the state's traditional fiber optics is transparent and soft, made of glass or plastic, and has a circular cross section.
The simplest fiber consists of a two-part coaxial cylinder that forms a light-conducting core and an outer cladding. To prevent leakage of the fiber, the cladding has a lower refractive index than the core.
A single glass fiber has a diameter of 50 and is usually protected by a sleeve on the outside of the fiber or bundle.
Figure corpse Yinkou production`, Yinzhou one by one, the sound of a small light in the fiber is the use of total reflection phenomenon to spread.
When light is incident from the optically dense medium to the optically permeable medium, refraction occurs at the interface.
According to the law of refraction, the angle of refraction is greater than the angle of incidence. When the angle of incidence is equal to the angle, the angle of refraction increases until the refracted ray propagates along the interface.
If the angle of incidence continues to increase, there will be no refracted rays, and all rays will be reflected back into the original medium, such as light (3), a phenomenon known as total reflection.
The angle of incidence when the total reflection can occur is called the critical angle. As long as the incident angle of the light is larger, it will be reflected back to the original medium. The interface between the two media is like a mirror.
By the same principle, light will be confined to the core of the fiber and ejected from the other end of the fiber by total reflection.
The angle of incidence of the light at the end face of the fiber must be limited to the cone of light at the apex angle.
If the angle of incidence is not within the angle of the cone of light, after refracting at the entrance, the angle of incidence of the light incident on the core and cladding interface will be less than the critical angle from which the light will escape through the interface.
The incident cone angle of the fiber is critical when selecting or designing the source generator.
The angle of incidence is determined by the refractive index of the core of the fiber and the cladding material and is achieved by the size of the opening in the twisting device.
In the transmission of light, we often need high luminous flux, which means that the numerical aperture of the optical fiber should be selected as large as possible by reducing the refractive index of the cladding.
There are generally two types of illumination fiber optic system end-emitting point illumination fiber optic illumination systems or side-illuminated line illumination fiber optic illumination systems.
In an illumination system that terminates the illuminating fiber, light is conducted from the source generator to the destination, and the ends of the fiber are often equipped with optical components to achieve the desired light distribution.
The function of the light source generator is to combine the light source with the incident end of the fiber.
The light source used is different, and the precision of the twisting is also different.
Various filters can also be added, such as filtering the heat of the beam to prevent the fiber from overheating and changing the color of the filter infrared.
The most widely used fiber optic terminal, consisting of a single lens group, is designed to determine the type of beam.
Depending on the shape of the surface, the shape of the spot obtained is also different and there is almost no light loss.
Some of the output devices are also equipped with a bamboo adjustment mechanism.
The side-emitting optical fiber illumination system uses a special optical fiber, which transmits light through the fiber wall, adopts a method of arranging the light source generator at two ends, or winds the end of the light back to the light source generator to obtain better brightness uniformity.
If you want to achieve higher efficiency and proper light output, you need a high-brightness light source.
Theoretically, only compact gas discharge lamps and small tungsten halogen lamps can be used as a typical low-power light source with a display box illumination.
If the requirements are more complicated and the output luminous flux is more, a tungsten tube can also be used.
In general lighting or building lighting, a compact gas discharge lamp or a light source such as a metal halide lamp source is usually employed.
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However, recent research has focused on combining a short arc size with good light color and long life.
The compact gas discharge source developed for the automotive industry is very close to the source of the fiber optic illumination system. In fact, the efficiency of such a fiber optic system is higher than that of a system using a tungsten halogen source.
The light enters the fiber bundle from the light source. Assuming that the bright spot area of ​​the light source is the half-angle of the end face area of ​​the optical fiber, the maximum incident efficiency is the same. The relationship will be as follows. The concentrating optical system is independent, that is, the maximum jerk efficiency is independent of the type of concentrating optical system of the light source. For example, if a lens is used instead of a reflector, there is no effect on the result, and vice versa.
From the formula, the best way to concentrate a large amount of light on a small fiber is to use a light source with a high luminous flux and a small surface area. The high-intensity point source is actually on the axis of a well-designed elliptical reflector. Installation of the discharge lamp, the efficiency will be very high, often reach the theoretical value of 60 other types of reflective light bulbs, such as sC closer to the theoretical value, but not practical.
One of the characteristics of optical fibers is that they can bend around obstacles.
However, there is a limit to the radius of the bend so that light does not escape the cladding and cannot be transmitted to the end of the fiber.
For a particular fiber, the minimum bendable radius is a multiple of the fiber diameter, usually a multiple of the diameter, which is often determined by the fiber manufacturer.
The velvet corpse fires up and down. The squad is not all light entering the optical fiber will be emitted from the other end of the fiber, part of the light will be absorbed and scattered in the fiber, this loss is called fiber attenuation.
The unit varies with wavelength.
That is to say, the spectral composition of the emitted light will vary depending on the length and type of the optical fiber used.
Of particular note is the unit decibel for the fiber, which represents the ratio of the luminous flux, ie small, small, medium and small.
The middle is the input and output light.
For plastic optical fibers, the attenuation rate is one for glass fibers. For outdoor lighting, the fluorescent tubes are used in the past, and the side-emitting fibers can also be used in various forms.
Although the brightness of such fibers is low, they can produce contours with varying colors, and their application range is wider than that of the ground neon, and can even be used in water.
Fiber optic system output efficiency is very low, usually only 30. However, fiber optic lighting systems are still more efficient with their high power and efficient light source than with conventional large inefficient light source mounting systems.
Due to the unique advantages of fiber, it is gradually used in areas that require more than just efficiency.
For example, it can be installed on the elevator for a picture. Philips and the fiber series provide efficient solutions for various projects. The modular products can be flexibly selected to provide optimal configuration and tailor-made for the project. Light source.
The bow meets the special requirements of customers and has its various terminals.
A variety of special effects are available. Philips' fiber-optic series is not only easy to operate, but also has low monthly operating costs because of the low energy consumption and reduced maintenance costs, especially for fiber optics and terminals. maintain.
A new generation of Philips fiber optic lighting systems A new generation of light sources, the emergence of a new generation of light sources, with an innovative optical system, excellent internal combustion efficiency, optical flux at the optical end up to the light exit surface of the high-pressure micro-gas discharge lamp does not have a built-in Reflector, stable performance, easy to fix on the focus point, which is especially important when replacing the light source. The life of the light source is up to hours. There is an optical system in front of the light source, one end is connected to the light source, and the other end is connected to the exit end of the fiber. The inclusion of a complex lens system maximizes the efficiency of the catastrophe.
The light source is a cool-colored surface system that can be used in areas where a clear light or strong beam is desired.
Figure 8 color wheel from the beginning of the design, the light source generator has been set up some devices to produce special lighting effects, such as the color effect of the starry sky flashing effect.
Today, in a large number of professional lighting projects, an external control system can be used to achieve more design effects. For front-lighting, synchronous clocks are used for more complex effects such as sound and light performance using a control system or a custom system.
In the light source generator, the light from the source is focused at the input of the fiber.
A new generation of light sources is used, and more light energy is concentrated in the fiber. This is due to the built-in optical system, which improves the efficiency of the fault and blocks the heat transfer. The input end of the fiber is also polished and accurately compressed. The glue-free end-emitting fiber consists of a large number of fiber bundles, each of which has a diameter ranging from to unequal.
The fiber has a good flexibility.
It is a good photoconductor of the whole spectrum. In recent years, its high-light output rate has increased the length of the fiber from 0 to 0.
The average lumen value of each fiber is shown in the attached table. The reference length is due to the decorative effect of a fiber mainly used for the starry sky. The lumen value is not important, so it is the default.
Fiber-optic diameter source generator type and lumen output value For side-emitting fiber, the diameter is usually a fiber length and uniformity, which can be applied to a variety of light source generators.
The output rate has increased the length of the fiber from 30 to 30. The average lumen value of each fiber is shown in the attached table. The reference length is due to the decorative effect of a fiber mainly used for the starry sky. The lumen value is not important, so the default .
Fiber-optic diameter source generator type and lumen output value For side-emitting fiber, the diameter is usually a fiber length and uniformity, which can be applied to a variety of light source generators.
In the interior lighting project, a wide variety of fiber optic terminals can be used to embed a downlight mini spotlight.
In the case of high functional lighting requirements, professional lenses can also be used, with beam angles ranging from one degree to one.
In the outdoor lighting project, a series of spotlights with adjustable angles of waterproof terminal can be used, and the application range is wide.
In short, in the fiber-optic lighting system, the performance from the light source generator to the terminal is widely improved, and its application is not limited to the star-sky effect, but begins to truly enter the lighting application field.
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