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Rail measuring system

  • US 10,444,095 B2
  • Filed: 07/18/2016
  • Issued: 10/15/2019
  • Est. Priority Date: 01/21/2014
  • Status: Active Grant
First Claim
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1. A method of measuring a shear deformation which acts on a rail with a longitudinal extension using at least one fiber optic sensor unit, the shear deformations caused by a train running on the rail, the rail having a neutral axis which extends along the longitudinal extension, wherein the areas above and below the neutral axis do experience the shear deformation, wherein the neutral axis does not experience the shear deformation, the method comprising the steps of:

  • providing the at least one fiber-optic sensor unit across the neutral axis at a positive first angle of 30°

    to 60°

    relative to the neutral axis or at a negative angle of −

    30°

    to −

    60°

    relative to the neutral axis, wherein the at least one fiber-optic sensor unit is mounted to the rail, wherein one mounting point of the fiber-optic sensor unit is disposed on one side of the neutral axis and another mounting point is disposed on an opposite side of the neutral axis;

    irradiating the at least one fiber-optic sensor unit with a primary light for generating a signal light in a reflection mode or a transmission mode;

    detecting an intensity of the signal light;

    evaluating a wavelength change between the signal light and the primary light; and

    determining the shear deformation based on the wavelength change.

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