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Method and apparatus for optical method of measuring rail displacement

  • US 4,181,430 A
  • Filed: 02/19/1976
  • Issued: 01/01/1980
  • Est. Priority Date: 03/05/1975
  • Status: Expired due to Term
First Claim
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1. Apparatus for optically measuring rail displacement of the rails of a track, comprising a light projector means for mounting on the truck of a railway car above the level of said track for only lateral movement with said truck, said light projector means having a light source and being positioned to direct the light toward one of the rails, the light projector means shaping the light from the light source into a beam which is converged on a measuring axis connecting the points on the sides of the heads of the rails of the track as to which displacement measurement is being made and along a length of the measuring axis which includes the position of the measuring point on the side of the head of said one rail with said one rail in the proper position, the light falling on the side of the head of said one rail at said measuring point in a bright spot or band of light, a light-receiving means for mounting on said truck out of alignment with the axis of the beam of light from said light projector means for receiving an image for sensing the shift of position of the image of the bright spot or band, and comparison means coupled to said light receiving means for comparing the shift of the position of the image with the normal position of said image for determining the amount of shift of said one rail.

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