Research On Optimization Scheme Of Railway Foreign Object Intrusion And Perimeter Intrusion Alarm System

China is one of the most developed countries in railway industry,and many railway technologies are in the lead in the world.By the beginning of 2019,China’s railway operation mileage reached 131,000 kilometers,of which high-speed rail accounts for two-thirds of the world’s total high-speed rail.Railway is of great significance to economic growth,transportation and national development.Among them,railway safety is the prerequisite guarantee for railway development.The environment along the railway is complex.Address disaster and human invasion are two important factors affecting railway safety.Aiming at the above problems,this paper makes a deep research on related technologies,and designs foreign body intrusion detection system and perimeter intrusion alarm system combined with advanced optical fiber sensing technology.This design can realize railway operation environment detection and alarm,and can effectively identify all kinds of illegal intrusion and intrusion behavior.The main research contents are as follows:Firstly,the basic principle of optical fiber sensor is analyzed,and the typical optical fiber sensor technology on the market is analyzed in detail,and its characteristics are summarized.Secondly,various technical schemes for railway foreign body intrusion detection in various countries are studied in depth.According to the scene of foreign body intrusion detection at tunnel entrance,the detection characteristics and application requirements are analyzed,and a joint intrusion detection scheme using fiber Bragg grating vibration sensor and broken network monitoring sensor is designed.Fiber Bragg grating vibration transmission Sensors can detect the degree of foreign body impacting the protective net and the damage degree of the protective net by breaking the net.It can not only meet the requirements of high precision,high anti-interference ability and high reliability,but also prevent misjudgement caused by high precision.At the same time,the sensor layout,communication architecture,transmission mode and judgment mode of the whole system are discussed.The system is realized by modularization,and the related data are tested.Finally,the common perimeter intrusion alarm system is analyzed and its advantages and disadvantages are summarized.At present,railway perimeter intrusion detection mainly uses traditional sensor mode.The accuracy of the system is greatly affected by environmental factors,and the data type that can provide intrusion judgment for the background is relatively single.Based on the above situation,this paper chooses vibration optical fiber as sensing device to design intelligent optical fiber perimeter security system.The system has the outstanding advantages of anti-electromagnetic interference,lightning strike,no spark,intelligent identification technology,safety and reliability.At the same time,the intrusion detection and alarm subsystem and video subsystem are designed.Linkage design,when the optical fiber sensor detects an intrusion,the alarm subsystem alarms,and sends the location of the intrusion point to the video subsystem to collect the image of the intrusion point,so as to determine the intrusion more accurately.The design optimizes the accuracy of the system and the types of data,and at the same time optimizes the system reality.The related details are discussed in detail.