Locometer: on-line inspection of locomotive wheel to rail movements using high precision CCD metrology

Peter Seitz; Michael T. Gale; Heinrich Meier; Jeffrey M. Raynor; P. Wolff; M. Hecht

doi:10.1117/12.20256

1 August 1990 Locometer: on-line inspection of locomotive wheel-to-rail movements using high-precision CCD metrology

Peter Seitz, Michael T. Gale, Heinrich Meier, Jeffrey M. Raynor, P. Wolff, M. Hecht

Proceedings Volume 1266, In-Process Optical Measurements and Industrial Methods; (1990) https://doi.org/10.1117/12.20256
Event: The International Congress on Optical Science and Engineering, 1990, The Hague, Netherlands

Abstract

A CCD camera based optical metrology system has been developed for the accurate measurement of a railway locomotive''s wheel movements with respect to the rails. The system is based on the light-sectioning method implemented with four laser diodes projecting light sheets onto the wheel and rail. A high-resolution CCD camera views the four profiles simultaneously using an appropriately folded and combined beam-path. To minimize the effects of ambient light a special narrow-band dielectric filter was designed manufactured and fitted in front of the camera lens. The desired measurement accuracy requires pixel-synchronous acquisition of the CCD video data. This is realized with a custom-built universal CCD data acquistion system with which profile tracking data compression and storage at 12. 5 Hz (half frame-rate) is made possible. A prototype system was built and tested on railway tracks at up to 140 km/h. In laboratory experiments the system surpassed the required measurement accuracies about fivefold attaining an accuracy of 0. 02 mm in relative position and better than 0. 1 mrad in relative angle. 2.

Citation Download Citation

Peter Seitz, Michael T. Gale, Heinrich Meier, Jeffrey M. Raynor, P. Wolff, and M. Hecht "Locometer: on-line inspection of locomotive wheel-to-rail movements using high-precision CCD metrology", Proc. SPIE 1266, In-Process Optical Measurements and Industrial Methods, (1 August 1990); https://doi.org/10.1117/12.20256

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