Fiber Grating Technology In Perimeter Intrusion Alarm System

With the social progress, rapid economic development and the continuous improvement of quality of life. People’s security requirements are constantly increased, and thus the perimeter intrusion alarm system to become the first line of defense for people security. The protection of the perimeter monitoring alarm system applications, mainly in the infrared on the radio detection systems, laser beam detection systems, microwave detection system, electromagnetic leakage cable systems and electronic fence system, etc. These alarm systems currently in use have their own characteristics and use, but has its limitations, such as the installation of complex equipment concealment, false positive rate and other shortcomings. The advantage of the above problems, the use of fiber optic sensing technology, R&D perimeter intrusion alarm system to meet the modern society, a variety of places. It has an outdoor passive, any addressing of the sensing area, can field the laying of anti-electromagnetic interference, anti-lightning strike lightning, etc.In modern times, based on the monitoring of the fiber grating sensing technology, the measurement has been applied to many fields, such as coal, oil tanks, oil pipelines, bridges and other sensitive facilities. Therefore, based on fiber Bragg grating, perimeter intrusion alarm system research and development of great significance.This article from the theory, combined with the experimental fiber grating sensing technology in the fiber grating perimeter intrusion alarm system. This paper details the social power class and the fiber class of anti-intrusion alarm system, to identify their strengths and weaknesses by analyzing research and development of a fiber grating vibration sensor-based perimeter intrusion alarm system. Effectively compensate for the lack of previous anti-intrusion alarm system, implementation of all-weather alarm, with a high immunity, science addressing, and outdoor passive and able to meet the requirements of the present perimeter intrusion alarm system.The system structure of the fiber grating vibration sensor. Analysis introduced first by the pressure and temperature sensing properties of the fiber grating, and thus the function, composition and working principle of the fiber grating vibration sensor. Determine the design requirements of a fiber grating vibration sensor, and also used the ANSYS finite element analysis software for the relevant parameters of the fiber grating vibration sensor were analyzed to determine the best structure of the fiber grating vibration sensor. Fiber grating vibration sensor size of the mass specifications Φ (5*15)(mm*mm), the pre-tension of the fiber grating between0.8nm to1nm, fiber grating between two fixed ends the distance is100mm, the natural oscillation frequency of20Hz.Finally, the fiber grating vibration sensor package carried out experimental research and data analysis through experiments and data analysis to identify different materials packaged fiber grating vibration sensor using quartz glass tube as packaging materials, fiber grating vibration sensor by the externalminimal impact. Fiber grating vibration sensor in the package after, waterproof, anti-fall experiments, waterproof and compressive strength of the quartz tube glass fiber grating vibration sensor package is very good.Finally, the fiber grating sensing technology based perimeter intrusion alarm system, made a comprehensive introduction.