All-fiber firewall monitoring system is the line of defense of security

All-optical fiber perimeter monitoring Today, terrorist organizations and terrorists have become increasingly active, population flows have increased dramatically, and social instability has been on the rise. As a result, national security and national property security have become increasingly defensive tasks and pressures, making our country’s harmonious society Construction also faces great challenges. As a result, higher requirements and greater challenges have been put forward for the national economic unit's own security system to “prevent destruction, prevent intrusion, and prevent accidents” and real-time monitoring and early warning. Among these, perimeter protection (firewall) is the first line of defense. Whether or not it is effective determines whether it is possible to detect unsafe factors as quickly as possible and minimize the insecurity factor.

Traditional perimeter security solutions Application features Over the years, the traditional perimeter security solutions (infra-red solutions, video surveillance solutions, microwave-injection solutions, leaky cable solutions, vibration cable solutions, electronic fences, power grids, etc.) for the community Safeguards have made due contributions, but subject to some objective technical conditions and other factors, there are still some common or personality deficiencies, as follows:

Infrared and other traditional solutions have a low level of protection and are easily crossed or circumvented by intentional intruders. At the same time, they are subject to environmental constraints such as high and low terrain conditions, twists, turns, and bends, and they are not suitable for harsh climates and are vulnerable to High-temperature, low-temperature, strong light, dust, rain, snow, fog, frost and other natural climate effects have a high rate of false alarms.

Leakage cables and vibration cable alarms belong to cable sensing. Sensing parts are all active, and the system consumes a lot of power; electronic fences, power grids and other solutions are also harmful. The above schemes can monitor short distances and high unit distance costs. In the case of long-distance monitoring, the system cost is high. And the life of the sensor unit is short, continuous use for a long time, high maintenance costs;

Increased interference opportunities (electromagnetic interference, signal interference, crosstalk, etc.), decreased sensitivity, increased false positives, and false negative rates;

For large-scale monitoring, the above traditional solutions do not have positioning functions, and they cannot be located when they encounter intrusive behavior. This means that it is not possible to determine the dangerous location in a timely and accurate manner and cannot take prompt measures to prevent the intrusion from causing the core area to be compromised and destroyed.

In summary, traditional perimeter security solutions based on electrical sensing technology are subject to many functional defects due to limitations in their own technical conditions. In the new era, the perimeter security system must be able to identify and respond to various intrusion events in a timely manner and must have long distances. Monitoring, high-precision positioning, low energy dependence, high environmental resistance, resistance to electromagnetic interference, and corrosion resistance.

Application advantages of fiber-optic sensors Compared with traditional electrical sensors, fiber-optic sensors have very obvious technical advantages in sensor network applications. They are small, lightweight, and have very good reliability and stability.

Passive system and low energy dependence can greatly save the cost of power supply equipment and lines, and is suitable for long-distance use;

Anti-electromagnetic interference, anti-corrosion, completely free from lightning, can work in harsh chemical environment, field environment and strong electromagnetic interference and other places;

No radiation, no inflammable and explosive materials, waterproof, environmental protection, etc.

All-optical fiber perimeter monitoring and warning system The all-optical fiber perimeter monitoring and early warning system is a security alarm system constructed using high-tech technologies such as laser, fiber optic sensing, and optical communications, and is a modern monitoring and alert system for threatening public safety. Defensive system, which is based on distributed optical fiber sensing technology applied to the perimeter monitoring protection of the new system.

The system uses a single optical fiber (optical cable) as a sensor-transmitting combo device and transmits it to the optical fiber (cable) through the direct contact and the optical fiber (cable) or through the carrier such as cover soil, wire mesh, fences, pipes, etc. Disturbances for continuous and real-time monitoring. Acquisition of disturbance data, after back-end analysis processing and intelligent identification, to determine different types of external interference, such as climbing barbed wire, pressing walls, running or walking in restricted areas, and mechanical construction that may threaten perimeter buildings, etc. System early warning or real-time warning, so as to achieve the purpose of early warning and monitoring of the threat behavior that invades the perimeter of the fortified area. For precise positioning, only the exact length of the optical fiber is obtained, and the length of the optical fiber is converted into an actual distance according to the site conditions. Accurate and reliable positioning accuracy is obtained in the alarm information, thereby realizing the positioning alarm function of the remote safety protection system through the system. The location of the provided invading site can be linked to CCTV surveillance or sent to the site.

The core technology, as a special distributed optical fiber sensing monitoring and monitoring technology with positioning functions, requires all components and parts to be made locally, and the entire system engineering is relatively simple to implement and apply. Compared with other traditional security systems, the advanced technology lies in :

Combined optical path design, single fiber fusion external intrusion detection and positioning in one;

Pattern recognition system to reduce system false alarm rate;

Signal processing system for realizing voice monitoring and recording in high-risk areas;

Unique system architecture that can be integrated with other sensor monitoring systems.

Core functions 1. Long-distance intrusion monitoring is continuously monitored in real-time at any point along the entire fiber installation area.

2. Intrusion Positioning When judging that a threat intrusion occurs, the system can locate the intrusion point in real time according to the modulation analysis of the optical signal, so that the security personnel can promptly take effective measures to the target in a clear and timely manner to prevent the follow-up of the intrusion.

3, pattern recognition Non-harmful environmental disturbances such as thunder, firecrackers, car rings, rain sounds, etc. to identify, make harmless judgment; can also identify walking, climbing, touching, digging and other intrusive behavior and alarm.

4. Voice monitoring of important parts For local high-risk areas, the system can implement voice monitoring and recording. This function completely eliminates the need for electrical or metal sensors. It can be realized using only optical fibers, which enriches the function and degree of protection of a monitoring system using a single optical fiber.

5, with other monitoring systems (acoustic photoelectric alarm) linkage system structure All-optical peripheral monitoring and early warning system consists of the monitor, the main control device, guide cable, optical fiber sensor and external components of the five major components. Among them, the system monitor and master controller are located in the central monitoring room, and the guiding optical cable, sensing optical cable and external components are installed outdoors. A sub-control center can be set as required.

The typical application system can use different optical cable laying methods according to the different needs of various perimeters: hidden buried, fenced, walled, clear, concealed laying.

1. Long-distance border warning systems Important national borders, bonded zones, customs ports, etc. Long-distance large-scale prevention of intrusion or cross-border vigilance, especially in the mountains, desert wilderness, artificial patrol inspection is not easy to place fiber optic cordon.

2. The perimeter of important facilities shall be used for security defense of military sites and national defense facilities: such as troops, airports, military ports, missile/rocket launch bases, radars, and communication sites;

Important national economic facilities: power stations, substations, cultural museums, financial warehouses, stadiums;

The defense of flammable and explosive places: oil depots, gas stations, oil and gas storage tanks, explosives, etc.

Important protection against all places of protection: prisons, schools, reservoirs, industrial mines, and important residential areas.

3, protection of oil and gas pipelines (anti-excavation, anti-theft, vandalism)

4. Protection of Communication Power Cables Based on the continuous development of optoelectronic technology and optical fiber sensing technology, fiber-optic sensing technology based on the fiber perimeter security alert system has been successfully applied in Europe and the United States developed countries to achieve mobile, vibration sensing The alarm functions such as micro-strain detection and positioning have been widely used in military bases, command posts, national defense, aerospace bases, and other places, and have been rapidly promoted to civilian use.

At present, foreign products are gradually entering China, but due to the fact that these products have just been turned from military to civilian use, they are expensive and cannot be used effectively in China; at the same time, they are systems that monitor the situation and the perimeter of important sites in the country. The operation and maintenance must be real-time and cannot be interrupted. The use of foreign monopoly equipment and products will bring considerable inconvenience to product debugging, installation guidance, post-maintenance, and performance upgrades, and even pose potential threats to confidentiality.

Therefore, the safety precautions of important places require both the advanced nature of the equipment used and the need to combine confidentiality requirements to ensure that the monitoring technology used is best of originality and uniqueness. This has the effect of developing proprietary intellectual property rights. International advanced level, technical performance unique, can improve China's perimeter prevention technology level, and meet the needs of China's current security technology protection system at the current stage of the fiber optic intelligent security system put forward an urgent need. With the popularization and application of all-fiber perimeter intrusion alarm products in China, the all-optical perimeter monitoring and warning system will usher in a broader space for development.