The astronauts on the Shenzhou-7 spacecraft will realize the Chinese's first entry into space. A set of LED lighting systems developed by Shanghai scientists will illuminate this historic moment. Yesterday, the reporter saw this magical light in the Shanghai Institute of Technical Physics of the Chinese Academy of Sciences.
The white LED bulbs are arranged in a half-size A4 paper-sized base, which is a bit like a large octopus leg with a sucker.
Although the arranging is not comparable to the spotlights in the theater, this unappealing little guy opens up, but it is so dazzling that it can be seen in the opposite direction: it can be in the horizontal 160-degree, vertical 80-degree three-dimensional space, even if the object is away from the light source 3 Mido can also make the object successfully captured by the CCD camera. The energy it consumes is surprisingly small, with only 27 watts and 25 watts of incandescent lamps illuminating a small bathroom.
The project leader and researcher Zhang Tao of the Shanghai Institute of Technology of the Chinese Academy of Sciences said that in the past, gas discharge metal halide lamps were used in space lighting in the world, which has high power consumption, high voltage and high heat, and is not an ideal space illumination source. In recent years, LED lighting has developed very rapidly. It is not only highly efficient, but also safe and reliable. It is likely to replace metal halide lamps and become a new generation of space lighting sources. This application to the Seventh God is a historic attempt.
The environment in outer space is very harsh: in the face of the sun, the temperature is hot to hundreds of °C, and when it is carrying the sun, it is cold to more than -50 °C, and it also bears the uninterrupted bombardment of various high-energy particles in the universe, as well as the various stages of the launch of the spacecraft. Extremely harsh mechanical environment. In order to make this lighting system shine in space, scientists have made 18 martial arts: the white coat outside it is a special temperature-controlled white lacquer that can not only eat high-energy particles and resist sunlight. There is also a strong heat dissipation capability. It is important to know that high temperatures can be a deadly threat to the brightness of LEDs, and radiation cooling is one of the most effective ways to dissipate heat in space. In order to make the light gently and evenly illuminate the area where the astronauts are out of the cabin, the scientists arranged the 24 small bulbs into a wave shape by means of a Fresnel lens. The angle of each bulb was accurately calculated and also carried out. Anti-glare treatment to prevent astronauts from seeing the lights in the dark universe, causing dizziness.
Stable and reliable, it is the top priority for aerospace devices. The main researcher Liu Shishen assistant researcher told reporters that the 24 bulbs on the lighting system are redundantly backed up each other. Even if one of them fails, the energy will be distributed to other bulbs, making the other bulbs brighter to make up for the dark spots. Based on rigorous calculations and testing, the lighting system has an average trouble-free working time of more than 1 million hours. It is reported that the surveillance lighting of future transportation spacecraft will also adopt this kind of LED lighting system, and the brightness and illumination distance will be greatly improved by then.
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