App152 en measurement-railroad-rails-laser-profile-sensors
0 likes158 views
The document discusses using laser profile sensors to measure railroad rails to assess wear and prevent costly incidents from derailment. It describes mounting two synchronized scanCONTROL 2800 sensors under inspection cars traveling up to 100 km/h to quickly and accurately measure full rail profiles. The scanCONTROL 2800 sensors are the fastest and most precise available, meeting the demanding speed and accuracy needs for rail inspection.
App152 en measurement-railroad-rails-laser-profile-sensors
- 1. A152_e 2D/3D profile sensor scanCONTROL2800 Measurement of railroad rails with laser profile sensors Guaranteeing the safety and stability of railroads when transporting persons or goods nowadays plays a significant role. In this respect the track is an important link in the chain. The increased loading of the rail network and the higher speeds of modern trains lead to higher stressing of the rails. The state of the tracks must be inspected regularly to prevent costly incidents. The wear of the rail head is an important parameter in reliably assessing the state of the rails. If the wear is too high, this can lead in the worst case to train derailments. Conventional inspection methods are based on visual manual inspections. This procedure is how- ever fraught with disadvantages: too slow, too inaccurate and therefore inefficient. The most innovative technical solution for railroad rail measurement is the profile sensor scanCONTROL 2800. Scanning laser sensors or so-called light-section sensors have been available on the market for some time. Extensive tests have shown that they are too slow and have problems with the different reflective properties of railroad rails which can be shiny metallic and also corroded in some places. The scanCONTROL2800 is the fastest precision profile sensor on the market and is therefore the only one to fulfill the requirements with regard to speed and accuracy.
- 2. Application Procedure for railroad rail measurement System set-up The measurement occurs without contact and it is 1. Per rail 2 x LLT2800-100(205), i.e. 4 sensor very accurate and fast. To be able to acquire the systems per inspection car. whole profile of the rail head two LLT sensors are 2. Measurement computer and evaluation software required. Per inspection car four systems are supplied by the customer. employed which are synchronized to each other. The measurements take place at speeds of up to 100 Decisive advantages for the customer km/h. 1. Fast measurement rate saves time and therefore In the measurement computer an ideal profile is costs. saved which is continually compared to the measu- 2. Higher accuracy than the previous subjective red profile. If the preset tolerances are exceeded, the visual inspection. rail is classed as unsafe and marked in the PC. 3. Fire-Wire interface enables a fast transfer of measurement data. Measurement system requirements 4. Customized adaptations (larger focusing distan- Measurement range X = 125 mm ce, laser with 50 mW) lead to optimum results Measurement range Z = 50 mm with this special measurement application. Base distance 230 mm; Sensor with modified focusing distance. Dynamic response: 2000 profiles/s each with 128 scanCONTROL scanCONTROL measurement points z-ax Laser: 50 mW, class 3 B is Ambient conditions Temperature: -20 to +80 °C xis x-a (Special protective housing with heating for use in sub-zero temperatures.) Harsh ambient conditions; since the sensor is fitted to the underside of the car, it is subjected to the widest range of weather conditions and vibrations. Two synchronized profile sensors acquire the track profile to determine the wear. MICRO-EPSILON A member of micro-epsilon group. Koenigbacher Str. 15 Tel.: +49 (0) 85 42/1 68-0 info@micro-epsilon.com Certified DIN EN ISO 9001 : 2000 94496 Ortenburg / Germany Fax: +49 (0) 85 42/1 68 90 www.micro-epsilon.com Modifications reserved Y9781152