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Proceedings Paper

Locometer: on-line inspection of locomotive wheel to rail movements using high precision CCD metrology
Author(s): Peter Seitz; Michael T. Gale; Heinrich Meier; Jeffrey M. Raynor; P. Wolff; M. Hecht
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Paper 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.

Paper Details

Date Published: 1 August 1990
PDF: 7 pages
Proc. SPIE 1266, In-Process Optical Measurements and Industrial Methods, (1 August 1990); doi: 10.1117/12.20256
Show Author Affiliations
Peter Seitz, Paul Scherrer Institute (Switzerland)
Michael T. Gale, Paul Scherrer Institute (Switzerland)
Heinrich Meier, Paul Scherrer Institute (Switzerland)
Jeffrey M. Raynor, Paul Scherrer Institute (Switzerland)
P. Wolff, Schweizerische Lokomotiv- und Maschinenfabrik (Switzerland)
M. Hecht, Schweizerische Lokomotiv- und Maschinenfabrik (Switzerland)


Published in SPIE Proceedings Vol. 1266:
In-Process Optical Measurements and Industrial Methods
H. A. Macleod; Peter Langenbeck, Editor(s)

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