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Precise corrugation measurement from moving platforms: Creating a virtual reference line by using acceleration sensors

 
: Blug, A.; Dambacher, M.; Dimopoulos, N.; Knoll, G.; Wölfelschneider, H.; Höfler, H.

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Technisches Messen : TM 70 (2003), No.1, pp.14-19
ISSN: 0340-837X
ISSN: 0171-8096 (Print)
ISSN: 2196-7113 (Online)
English
Journal Article
Fraunhofer IPM ()
corrugation measurement; moving platform; virtual reference line; acceleration sensor; laser distance measurement system; triangulation sensor; uncertainty; rail head; running train; flatness control

Abstract
Laser distance measurement systems such as triangulation sensors offer an accuracy in the range of several micrometers at a bandwidth of 10 kHz or even higher. Their speed is therefore sufficient to measure from moving platforms, but it is difficult or often impossible to guide the platform with a precision comparable to the measurement accuracy. To compensate this uncertainty of the relative position of the measurement system an acceleration sensor was used to establish a virtual reference line for the distance value measured. The first application was the corrugation measurement of the rail head with a spectral accuracy better than 10 mu m from a running train superimposed to a vertical movement of about 10 mm. Further applications might be pavement quality control or flatness control of any stationary object measured from a moving sensor.

: http://publica.fraunhofer.de/documents/N-17040.html