In Bible Genesis, God says that there is light, and then begins to create the world. In the eyes of the German scientist Harald Haas of the University of Edinburgh, light itself is a world with a lot of information.
He cherished this world of light so much that at 4 pm, his office had not turned on the lights in Scotland in the early winter, and it had already entered the evening. Of course, the dark light can't stop the burly professor's enthusiasm, but also make Haas's office look less messy, such as a few integrated circuit boards thrown on the table, the opportunity to quietly hide in the dark. .
In fact, these two centimeters of square circuits, and the LEDs on his head, are Haas's treasures. In the information age where wireless networks have been everywhere in every corner of the world, mobile phones relying on Wi-Fi to access the Internet anytime, anywhere, has become a trend with a slight obsessive-compulsive disorder, and Haas intends to rely on his baby. Light carrying data online.
This advanced technology that relies on LED bulbs for wireless data transmission is called Li-Fi.
Optical transmission revolutionary idea <br> <br> Haas dissemination of data with light, began 10 years ago. "At that time, I realized that the 4G era is coming, and the devices that are using data to spread will soon be unable to keep up with demand. I think LED bulbs can be used for information transmission. Since then I have been studying LEDs. â€
In 2011, Haas led a research team that announced the use of LEDs to transmit data. They used flashing lights to transmit digital information.
The basic principle of this technique is simple: when the LED is on, it means 1 and when it is off, it means 0. Haas claims that by adding a microchip to the bulb, it can be controlled to flash millions of times per second. Because the frequency is too fast, the human eye will not notice it, but the photosensor can receive these changes. This binary data is quickly encoded into a light signal and transmitted efficiently. "It's like a Morse code sent with a torch, but it's faster and makes the computer easier to understand," Haas explained.
This "torch" that can send Morse code is everywhere. Because LED bulbs are very popular, lighting infrastructure is in place, and the visible light emitted by the bulb is part of the electromagnetic spectrum, 10,000 times larger than the radio spectrum, and relatively infinite, which makes Li-Fi more common. Radio communication systems such as WiFi are more convenient and cost-effective.
Professor Haas said that another advantage of Li-Fi is that evenly distributed LED transmitters can provide a more stable and regional Internet connection to the entire building. The downside of traditional WiFi is that the farther you are from it, the weaker the signal you get, resulting in unstable wireless network connections in the office and home.
Due to its many advantages, Li-Fi is seen as a revolutionary technology in the field of communications.
"In airports, stadiums and many other places, WiFi is often not connected, because the number of routers is limited. But look at how many lights in those fields, if each light becomes a router, then the amount of data transmitted is large More." In Haas's view, in places such as aircraft cabins and hospitals where WiFi is difficult to reach, as well as new areas such as self-driving cars and smart homes, Li-Fi is the place to go.
Haas himself is optimistic about the application of this technology in many industries. “For example, oil pipelines on offshore platforms should be inspected once every six months to ensure smooth flow. The cost per time is at least 200,000 pounds. These pipelines are generally not monitored by traditional means of information dissemination because of the risk of explosion. He said, for example, "But if you install an LED light source in a pipe, you can pass key information such as pressure and temperature to the other end of the pipe through the sensor."
Or create a $ 6 billion market <br> <br> new technology development is a systematic project, any part of a lag will affect the overall promotion.
At present, the development bottleneck of Li-Fi is mainly in the light source, but the lighting industry is undergoing tremendous changes, which may bring new opportunities. For example, South Korean producer Samsung has already sold its own lighting business, and Dutch giant Philips has also divested its 123-year lighting business.
“The lighting industry is now in a disorderly state. Manufacturers are reorganizing and striving for higher added value. This is a bit like a mobile phone. People use a mobile phone for more than 2 years and it will be replaced with new ones. This is not the old mobile phone. But the new phone has new features. Li-Fi is like creating a new smartphone on the roof.†Haas said, “But the lighting industry in China is developing very fast, and there are many lighting in recent years. Innovation comes from China."
According to Haas's vision, future lighting will be the second function of the light source, and the primary function is to transmit information. “Think about how many street lights are in cities around the world, and if they are all converted into signal sources, they will soon be ready for 5G.†In his smart city picture, if they reduce the output of street lights, even The street light is not visible during the day, but the Li-Fi signal emitted by the street light can continue to be received and thus access to the network.
Due to its broad use prospects, Li-Fi technology is widely optimistic.
Although most of the market is still in the laboratory stage except for some special orders, the CEO of Edinburgh Research and Innovation Bureau Derek Wardle has firmly believed that the solution provided by Li-Fi technology will be The world has created a new, $6 billion information market.
In the lab, Haas played the cartoon "Brave Legend" made by Pixar on a computer. The signal was uploaded from a flat LED lamp 10 meters away, because the signal transmission theory can reach up to 4G per second. Therefore, the movie is played very smoothly. However, when someone stands in front of the light that acts as a signal source, the Scottish red-haired princess on the computer screen will have a noticeable jam.
For this kind of obstacle, Haas himself does not say anything. “After all, light travels in a straight line. If you put multiple light sources on the roof, the situation will be better,†he said.
In fact, Haas, who has experience in Siemens, is definitely more market-savvy than many scientists living in the laboratory. After the light is blocked, the signal is greatly weakened or even disappeared. Even he is regarded as Li-Fi. Another advantage is widely publicized.
In his opinion, because light can't pass through the wall, new technologies may be safer than traditional WiFi connections. "For example, if a confidential meeting is held in a conference room, then the people in the room can only receive the signal from the overhead light, and the person outside the door can't receive any information," he said.
Well, this ray of fans may not have heard of the inspirational story of "powering the wall".
He cherished this world of light so much that at 4 pm, his office had not turned on the lights in Scotland in the early winter, and it had already entered the evening. Of course, the dark light can't stop the burly professor's enthusiasm, but also make Haas's office look less messy, such as a few integrated circuit boards thrown on the table, the opportunity to quietly hide in the dark. .
In fact, these two centimeters of square circuits, and the LEDs on his head, are Haas's treasures. In the information age where wireless networks have been everywhere in every corner of the world, mobile phones relying on Wi-Fi to access the Internet anytime, anywhere, has become a trend with a slight obsessive-compulsive disorder, and Haas intends to rely on his baby. Light carrying data online.
This advanced technology that relies on LED bulbs for wireless data transmission is called Li-Fi.
Optical transmission revolutionary idea <br> <br> Haas dissemination of data with light, began 10 years ago. "At that time, I realized that the 4G era is coming, and the devices that are using data to spread will soon be unable to keep up with demand. I think LED bulbs can be used for information transmission. Since then I have been studying LEDs. â€
In 2011, Haas led a research team that announced the use of LEDs to transmit data. They used flashing lights to transmit digital information.
The basic principle of this technique is simple: when the LED is on, it means 1 and when it is off, it means 0. Haas claims that by adding a microchip to the bulb, it can be controlled to flash millions of times per second. Because the frequency is too fast, the human eye will not notice it, but the photosensor can receive these changes. This binary data is quickly encoded into a light signal and transmitted efficiently. "It's like a Morse code sent with a torch, but it's faster and makes the computer easier to understand," Haas explained.
This "torch" that can send Morse code is everywhere. Because LED bulbs are very popular, lighting infrastructure is in place, and the visible light emitted by the bulb is part of the electromagnetic spectrum, 10,000 times larger than the radio spectrum, and relatively infinite, which makes Li-Fi more common. Radio communication systems such as WiFi are more convenient and cost-effective.
Professor Haas said that another advantage of Li-Fi is that evenly distributed LED transmitters can provide a more stable and regional Internet connection to the entire building. The downside of traditional WiFi is that the farther you are from it, the weaker the signal you get, resulting in unstable wireless network connections in the office and home.
Due to its many advantages, Li-Fi is seen as a revolutionary technology in the field of communications.
"In airports, stadiums and many other places, WiFi is often not connected, because the number of routers is limited. But look at how many lights in those fields, if each light becomes a router, then the amount of data transmitted is large More." In Haas's view, in places such as aircraft cabins and hospitals where WiFi is difficult to reach, as well as new areas such as self-driving cars and smart homes, Li-Fi is the place to go.
Haas himself is optimistic about the application of this technology in many industries. “For example, oil pipelines on offshore platforms should be inspected once every six months to ensure smooth flow. The cost per time is at least 200,000 pounds. These pipelines are generally not monitored by traditional means of information dissemination because of the risk of explosion. He said, for example, "But if you install an LED light source in a pipe, you can pass key information such as pressure and temperature to the other end of the pipe through the sensor."
Or create a $ 6 billion market <br> <br> new technology development is a systematic project, any part of a lag will affect the overall promotion.
At present, the development bottleneck of Li-Fi is mainly in the light source, but the lighting industry is undergoing tremendous changes, which may bring new opportunities. For example, South Korean producer Samsung has already sold its own lighting business, and Dutch giant Philips has also divested its 123-year lighting business.
“The lighting industry is now in a disorderly state. Manufacturers are reorganizing and striving for higher added value. This is a bit like a mobile phone. People use a mobile phone for more than 2 years and it will be replaced with new ones. This is not the old mobile phone. But the new phone has new features. Li-Fi is like creating a new smartphone on the roof.†Haas said, “But the lighting industry in China is developing very fast, and there are many lighting in recent years. Innovation comes from China."
According to Haas's vision, future lighting will be the second function of the light source, and the primary function is to transmit information. “Think about how many street lights are in cities around the world, and if they are all converted into signal sources, they will soon be ready for 5G.†In his smart city picture, if they reduce the output of street lights, even The street light is not visible during the day, but the Li-Fi signal emitted by the street light can continue to be received and thus access to the network.
Due to its broad use prospects, Li-Fi technology is widely optimistic.
Although most of the market is still in the laboratory stage except for some special orders, the CEO of Edinburgh Research and Innovation Bureau Derek Wardle has firmly believed that the solution provided by Li-Fi technology will be The world has created a new, $6 billion information market.
In the lab, Haas played the cartoon "Brave Legend" made by Pixar on a computer. The signal was uploaded from a flat LED lamp 10 meters away, because the signal transmission theory can reach up to 4G per second. Therefore, the movie is played very smoothly. However, when someone stands in front of the light that acts as a signal source, the Scottish red-haired princess on the computer screen will have a noticeable jam.
For this kind of obstacle, Haas himself does not say anything. “After all, light travels in a straight line. If you put multiple light sources on the roof, the situation will be better,†he said.
In fact, Haas, who has experience in Siemens, is definitely more market-savvy than many scientists living in the laboratory. After the light is blocked, the signal is greatly weakened or even disappeared. Even he is regarded as Li-Fi. Another advantage is widely publicized.
In his opinion, because light can't pass through the wall, new technologies may be safer than traditional WiFi connections. "For example, if a confidential meeting is held in a conference room, then the people in the room can only receive the signal from the overhead light, and the person outside the door can't receive any information," he said.
Well, this ray of fans may not have heard of the inspirational story of "powering the wall".
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