Application of Laser Sensor in Railway Industry

I. Overview:

The OPTIMESS laser displacement sensor mounted on the rail side can measure the position of the inner railway locomotive wheels at high speeds. A number of sensors on the same line near the measuring point collect the measured information on the running status of the locomotive wheels and optimizes them within the measuring points. At the same time, the positions of the rails and the wheels are measured to record the running status of the wheel devices. Other R&D applications include: displacement measurement of rails, coupling measurement of cars, vehicle inclination measurement and detection of connection line position.

Second, production due to uneven undulating surface, the track needs to be re-polished, grinding requires the removal of the hard part of the rail to reduce costs. A large-scale rail manufacturing company applied a non-contact measurement system for many years. Online laser measurement of the orbital surface and collection of the maximum and minimum data in the software and comparison with a long-term manual measurement showed that the maximum deviation of the two measurement methods was only 0.05. Mm. In addition, the non-planar measurement system for the 90° direction of the track surface has been tested and approved by many well-known railway companies.

Third, the contact line measurement Contact line (roof) position and height of the accurate measurement of the contact network monitoring and installation is very important. Appropriate contactless contact line measurement systems have been adopted by the Korea High Speed ​​Rail Corporation (KHRC) and the British OLE Alliance. The laser triangle scanner measures the height and lateral position of the contact line online during operation. The other 5 laser sensors are mounted on the carriage to measure the inclination, lateral displacement and track spacing of the carriage. All these data can be graphically displayed. The measurement system can be operated in almost any environment (rain, high temperature or frosty weather). 4. Track profile measurement In order to classify the wear condition of the rail top surface and evaluate the necessary maintenance work, the measurement car is above each side track. Install 5-7 laser sensors, operate at 80 miles per hour, record measurement data every 20cm, and compare with standard data stored in the central computer. The computer classifies the data according to given deviation values ​​and superimposes the measured values. The detected vehicle displacement data is also recorded and stored in the computer.

V. Measurement of track cross section In order to carry out the necessary grinding of the track profile, the shape must be monitored before and after grinding. For this purpose, OPTIMESS is used for spot measurement along the cross-sectional direction of the track, or a laser scanning device is used: the measurement point is scanned along the lateral profile of the track. The track section is compared with the standard shape stored in the computer, and the grinding parameters can be adjusted accordingly. .

6. Measurement of Wheel Profiles No contact to measure the wheel profile can quickly and accurately measure the wheel set parameters without direct contact. A laser sensor moves linearly along the contour of the wheel and records surface data. The computer obtains the wheel surface profile data by recording the scanning travel distance and the laser distance value, as well as characteristic change parameters such as wheel rim thickness, height, width, azimuth, and wheels. Standard sizes. In addition, through the joint development with the German Railways, this system is applied to both tramway and metro track measurements, moving forward and backward and directly integrated into the same wheel equipment. In addition, as a workshop mobile laser - wheel profile measurement system.

7. Wheel Set Measurement System As mentioned above, it is only the application measurement of the change of the wheel shape, so the application of multiple sensors in the 2-axis or 3-axis direction on the drive can detect almost all parameters such as wheel profile, impact, brake disc, smoothness, etc. As long as the wheel identification code is entered, all measured parameters will be automatically collected. The flexibility of the laser sensor in terms of size, measuring distance and measuring range also allows for the transformation or updating of existing contact measuring devices.