Method for high precisely detecting geometric outline of rail

Abstract

The invention belongs to the technical field of photoelectric detection and relates to a method for high precisely detecting the geometric outline of a rail. The method is suitable for analysis of rail gauge and rail wear. A plurality of lasers and a plurality of cameras are used to construct a joint measurement system. By means of the joint calibration of the measurement system and the comprehensive processing of acquired data, the geometric outline feature points of the rail in two non-overlapped dynamic three-dimensional coordinate systems are obtained with high precision. A detection device is simple and flexible to install and high in detection precision, can simultaneously calibrate the world coordinates of the bilateral rails, and completes the three-dimensional detection of the geometric outline of the rails. The detection device is simple and flexible to install and high in detection precision, and can simultaneously calibrate the world coordinates of the bilateral rails.

Description

technical field [0001] The invention belongs to the technical field of photoelectric detection and relates to a high-precision detection method for the geometric profile of rails, which is suitable for the analysis of rail gauge and rail wear. Background technique [0002] Railways are the main artery of national transportation, undertaking more than 70% of passenger and freight tasks, and lines are the foundation and soul of all rail transportation. The geometric dimensions of railway tracks are of great significance to ensure the safety and comfort of train operation. At present, my country's railway engineering departments still mainly use manual detection methods for the detection of track geometric contours. This measurement method has a large amount of work, slow measurement speed, low efficiency, and it is difficult to control the measurement accuracy. [0003] The laser camera detection method is a new method to realize the detection of the geometric contour of the ...

AI Technical Summary

Problems solved by technology

[0004] The difficulty of the laser camera detection method is that the experimental environment is difficult, the installation accuracy is difficult to guarantee, and there are many replacement relationships

If the conversion relationship is determined according to the traditional method, that is, each camera is calibrated in turn, and then the positional relationship between the cameras and the camera and a single rail is calibrated, although it does not need to depend on the scene and the calibration object, the robustness is poor and there is a problem of error transmission. , the precision of the obtained solution is low

The traditional calibration method is based on active vision. It needs to control the relative movement of the camera on the active vision platform. The requirements for the device are relatively high, and the installation accuracy cannot be guaranteed.

The traditional calibration method can only calibrate the bilateral rails separately. If only the positions of the rails in different coordinate systems can be obtained, the feature points corresponding to the geometric contour of the gauge are also located in different coordinate systems, and the geometric contour detection of the rail system cannot be performed.

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