Method and apparatus for noncontact relative rail...

Optics: measuring and testing – Position or displacement

Reexamination Certificate

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C356S622000

Reexamination Certificate

active

07403296

ABSTRACT:
An on-board, noncontact measurement system and method is disclosed for measuring track quality, vertical track stiffness and vertical track modulus for a portion of track underlying the rail vehicle. The system comprises first and second optical emitters mounted to the vehicle and configured to emit beams of light that are detectable on the underlying surface; a camera mounted to the vehicle for recording the distance between the beams of light as the vehicle travels along the surface, a mechanism for measuring the distance between the beams of light for a particular portion of the surface; and a mechanism for determining the vertical track stiffness or vertical track modulus for a particular portion of the track.

REFERENCES:
patent: 5753808 (1998-05-01), Johnson
patent: 6119353 (2000-09-01), Grønskov
patent: 6647891 (2003-11-01), Holmes et al.
G. Hayes, et al., “Track Stiffness Measurement System Evaluation Program” prepared for the U.S. Department of Transportation, Federal Railroad Administration, Office of Research and Development, Washington, DC, Final Report No. FRA/ORD - 79/30 (PB80-165293), Dec. 1979, pp. 1-174.

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