Optical fiber broadband industry is currently the fastest growing information industry, one of the largest space for development. Speeding up the construction of optical fiber broadband networks will promote the upgrading of network infrastructure, enhance the capability of independent innovation, and stimulate the development of related industries. It is important to respond to the financial crisis and achieve steady growth, structural adjustment, livelihood protection, and stability as well as the long-term competitiveness of the country Strategic significance The development of optical fiber transmission for the security industry, also has progressive significance.
New optical fiber technologies emerge
According to relevant media reports, researchers at the University of Southampton in the United Kingdom have produced a new type of optical fiber that can transmit data at 99.7% of the speed of light. Using this new optical fiber, researchers achieved a data transfer rate of 73.7Tbps, which equates to about 10TBps, which is 1000 times faster than the most advanced 49Gb optical fiber and significantly reduces the delay rate.
It is reported that the speed of light in the vacuum 299,792,458 m / s, but in other media, the propagation speed is usually much slower. In conventional optical fibers made of quartz glass, the speed of light slows down by 31%. In fact, light travels faster in the air than glass, and as a result, Southampton researchers use a hollow optical fiber that is almost completely filled with air.
Researchers have overcome this problem by thoroughly refining hollow designs, using a photonic bandgap edge. This new design delivers low loss (3.5dB / km), wide bandwidth (160nm) and much better delay than conventional optical fiber, resulting in a 31% increase in light and data transfer speed.
Fiber monitoring applications are of concern
Since the 21st century, along with the development of digital signal processing (DSP) technology and optical fiber sensing technology, a new security technology: optical fiber monitoring technology has drawn worldwide attention and has been popularized and popularized in Europe and the United States. This technology is different from the existing monitoring technologies based on traditional electromagnetic effects and dotted layout. It uses optical fiber as an external layout device integrating intrusion signal monitoring and signal transmission, and makes the omni-directional Sensing network, to achieve multi-regional, multi-morphological (linear, surface shape, spatial area shape) vibration detection and voice pickup. This type of monitoring technology has the outstanding features include:
Hidden, easy to layout. Optical fiber itself is a linear flexible medium, can be hidden, and the building non-destructive layout in a variety of environments and regions, flexible and free layout, you can fully complement Wen Bo security system perimeter alarm, channel alarm and space alarm three Review defense line. Its concealment also greatly reduces the vigilance of intruders on security equipment.
With outstanding anti-destructive. It is precisely because of the use of optical fiber hidden layout, while the principle of technology also has the confidentiality, unlike the camera and infrared blocking lines and other traditional technologies are well known, easy to identify, avoid and destroy; the same time, fiber optic probe without electromagnetic radiation, more resistant to electromagnetic Interference, common detection devices that detect based on electromagnetic and metal effects, are hard to spot with fiber optic probes, so fiber monitoring techniques are less likely to be circumvented and destroyed and highly destructive.
Fiber has the advantages of long transmission distance without relaying, no need to supply power to the sensor network deployed in the entire monitoring area due to low energy dependency, thus greatly reducing the risk that the electronic equipment may pose a potential safety hazard to the construction of wood or other material structures . And the system that does not need the power supply in the field also need not worry about the paralysis of the security system caused by the power-off of the breaker.
Unlike general linear or physical barrier detection system is easy to avoid the gap, fiber sensing network through the three-dimensional synergies function, like a huge neural network, from the ground, underground and space for voice pickup, It can accurately sense the movement and sound of the entire layout area and carry out all-round intrusion detection of environmental changes. Through intelligent behavior analysis and pattern recognition, it can accurately analyze and judge, and eliminate the environmental impact that may cause false positives and ensure that the system makes Highly accurate notification and alarm.
Small and transparent optical fiber, small optical fiber attached to the display items, or hidden under the booth, can be the most direct protection of cultural relics, cable's own physical and chemical properties, will not bring any harm to the cultural relics , Foolproof security monitoring purposes.
Optical fiber itself can be distributed over long distances on the ambient temperature real-time monitoring, as a safety monitoring of optical fiber can also be used at the same time temperature alarm monitoring. When the temperature around the artifacts beyond the preservation conditions, the system can handle the alarm.
Optical fiber itself is a non-metallic passive components, are not afraid lightning strobe, in the natural environment, will not corrode, not afraid of rain and snow, and even for damp and water environment. At the same time optical fiber sensor without energy dissipation, will not become a heat source, suitable for flammable and explosive places, to meet the high level of fire safety requirements. Very suitable for Wen Bo such security level is high, there are special places safety requirements.
Optical fiber voice monitoring from a variety of electromagnetic interference, electronic eavesdropping devices will not produce the usual current and signal noise, high-fidelity delay-free synchronous monitoring of the site to restore the ring.
Fiber monitoring technology and the existing video, infrared and other systems do not conflict with each other, can be compatible with the use of real touch, hear, see.
At present, China also has a series of fiber monitoring technology. Fudan University and other research institutes began to research and develop optical fiber dynamic monitoring technology around 2000, and optical fiber detection and alarm products were put into trial use in 2005. Based on optical fiber dynamic sensing technology, there are one series of products such as vibration detection of optical fiber intrusion, optical fiber voice monitoring, optical fiber line safety monitoring and optical fiber pipeline safety monitoring, which have outstanding features.
Such systems need to integrate optoelectronics, materials, physics, electronics, communications, computers and other disciplines, the general need to have a profound technical background of scientific research institutions presided over the research and development. At present, the technology, which is completely independently developed by China and whose technical route belongs to the international original, has filled in the gaps in the country and has completely surpassed the similar technologies abroad. A number of technical achievements have reached the international advanced level both in theory and in technology. National ministries and commissions, some provinces and cities, science and technology departments, including some industry authorities have begun to advocate the further deepening of the technology and application. During the Olympic Games and the World Expo have the technical products successfully put into use.
Custom Gear Reducer,Gear Box,Aluminum Die Gear Box,Auto Gear Box
Wuxi Sixleaf Machinery Co. LTD , https://www.wxsixleafmachine.com