Rail transportation axle-counting device for packaging FBG based on semi-freedom

Abstract

The invention discloses a rail transportation axle-counting device for packaging FBG based on semi-freedom degree, which is used for carrying out axle-counting on trains which passes by. The rail transport axle-counting device consists of a sensing part and a control and analysis part, and is characterized in that the sensing part comprises a laser light source, an optical circulator, an FBG strain sheet and a photoelectric detector; and the control and analysis part is an axle-counting detector; and the FBG strain sheet is fixed on a package tool connected with the bottom of the rail in a semi-freedom degree mode. In the invention, the FBG strain sheet is packaged by using the semi-freedom degree mode so that the intensity self-demodulation on the subjected strain can e realized without an additional edge filter, a system structure is simplified and the cost is greatly reduced. The axle-counting device can acquire whether wheels of the train pass by or not according to the intensity change of reflecting light and can acquire wheel axle information of wheel load from the intensity change of the reflecting light.

Description

Rail Transit Axle Counting Device Based on Half Degree of Freedom Packaging FBG technical field The invention relates to the technology of using matching optical fiber gratings in the field of railway signals to realize the monitoring of rail temperature strain, train axle number, axle load and running speed. Background technique Axle counting is to use the sensor to sense the signal of the train wheel passing, to judge whether there is a train passing and to obtain information such as the number of passing axles. The axle counting system can obtain information about the position of the train and whether the railway section is occupied or not. The reliability of the axle counting system is higher than that of the track circuit. The axle counting system is mainly composed of the axle counting sensor and detector at the front end and the axle counting calculator (evaluator) at the rear end. At present, the magnetic head sensor of the axle counting system is used to obtain ...

AI Technical Summary

Problems solved by technology

In order to solve the problem that the magnetic head sensor is easily disturbed, an axle counting system using a strain sensor is proposed. By sensing the periodic strain disturbance generated on the rail when the train wheels pass by, the number of train passing axles, wheel weight, and speed per hour can be obtained. information

Application number 200810105951.x discloses an axle counting system using strain detection and its implementation method. The method of combining strain sensors and magnetic head sensors solves the interference caused by magnetic head sensors such as pedestrians, shovels and other objects, but the system The analog signal transmission distance of the electronic sensor used is short, the detector needs to be installed near the track, the electromagnetic compatibility is poor, and the reliability and stability of the electronic strain gauge are also relatively poor; the application number is 200920088856.3 which discloses a train optical fiber grating axle counting system, The system uses the FBG demodulator to obtain the FBG center wavelength shift caused by the rail strain, and the demodulation speed is slow and the cost is high

At present, most of the axle counting systems have "+-1 axis" interference, which is susceptible to interference and has strict requirements for lightning protection; the strain gauge axle counting system using FBG has superior performance, but the cost is high and the speed is low, so it is not suitable Used in high-speed railway

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