Self-adaptive warning system for intelligently addressing circumferential intrusions of fiber Bragging grating

Abstract

The invention discloses a self-adaptive warning system for intelligently addressing circumferential intrusions of fiber Bragging grating. The self-adaptive warning system consists of a fiber Bragging grating vibration sensor, an optical transmission cable, a fiber grating signal demodulator and a security centralized control platform. When in detection, a plurality of the fiber Bragging grating vibration sensors with different wavelengths are connected in series with one optical fiber by the wavelength division multiplexing technology to acquire the distributed information; by acquiring and processing the fiber grating signals, the fiber Bragging grating vibration sensors are integrated with the application software of an upper computer into an intelligent management system to form a set of ideal and complete self-adaptive warning system for the fiber circumferential intrusion security. The system can be applied to the circumference intrusion warning guard, and can be used as the environmental sensing device by the circumferential intrusion of the intelligent addressing. The invention adopts the outdoor all-passive network type transmission system, so that the sensing region can be addressed freely. The passive transmission and the optical cable laying are applied to the system, so that the system is convenient for the on-site installation and no device debugging is needed on site; in particular, the invention has the advantages of suitability of the outdoor laying, lightning and flash resistance and anti-electromagnetic interference, capability of sufficiently meeting and being applied to the circumference security in various complex environments, capability of accurately solving the misinformation and the report missing and the like.

Description

technical field [0001] The invention relates to an alarm system, in particular to an intelligent addressing perimeter intrusion self-adaptive alarm system of an optical fiber Bragg grating. Background technique [0002] In the mid-1990s, developed countries, such as the United Kingdom, the United States, and Israel, took the lead in applying optical fiber transmission and sensing technology to the field of perimeter intrusion prevention and alarm. With the continuous exploration and development of optical fiber technology in the past ten years, the optical fiber detection and alarm system using optical fiber sensing as a detection method has gradually matured and stabilized. Compared with traditional alarm detection technology, it has anti-electromagnetic wave interference, wide application range and high sensitivity. , high concealment, strong anti-interference, anti-sabotage and many other advantages, and has been applied to military, nuclear sites, airports, warehouses, p...

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Problems solved by technology

Another example is that the double interference ring perimeter security positioning system with application number 200810224102.6 discloses the use of Sagnac interference rings to locate the position where pressure, strain, and vibration occur, but these systems all have the following defects and bottlenecks in popularization and application:

[0005] 1 The outdoor sensing part adopts an active structure: the outdoor sensing optical cable needs to be equipped with a working power supply, which cannot effectively reflect the excellent functions of the optical fiber, resulting in a decrease in system reliability;

[0006] 2. The sensing optical cable cannot be positioned accurately: due to the use of interference spectrum analysis technology, the precise positioning of the defense zone cannot be realized, and only fuzzy positioning can be realized according to the length of the defense zone division. The interference of multiple points in the defense zone can only be achieved through superposition (interference strengthening) or weakening) to show that it cannot meet the needs of small-scale, high-level defense areas;

[0007] 3 Poor environmental resistance: Since the sensing optical cable is an integral sensor, there are other factors besides vibration that cause changes in the interference spectrum, so the system has a high false alarm rate, which limits the scope of application;

[0008] 4 High system price: Since the overall technology of the system mainly relies on well-known foreign companies, the price has been high, which affects its marketing and application

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