Other

Thales Deutschland Gmbh

Mathias Mueller

Kassen Oldewurtel

Rainer Klemm

Martin Glueck

At least one fiber-optic sensor unit measures a mechanical variable which affects a rail having a certain length and a neutral axis that extends along said length of the rail. The at least one fiber-optic sensor unit is disposed at an angle of 30&#xb0; to 60&#xb0;, in particular 45&#xb0;, relative to the neutral axis or at an angle of &#x2212;30&#xb0; to &#x2212;60&#xb0;, in particular &#x2212;45&#xb0;, relative to the neutral axis. The at least one fiber-optic sensor unit is irradiated with primary light in order to generate a signaling light in a reflection mode or transmission mode. The intensity of the signaling light is sensed. The signaling light is evaluated.

Rail measuring system

An axle-counting method for railbound vehicles includes the following method steps: coupling light into at least one sensor fiber, wherein the sensor fiber includes at least one fiber Bragg grating mounted on a rail, wherein each fiber Bragg grating has a reflection spectrum having a reflection peak which is at a Bragg wavelength and has a full width at half maximum; generating a difference signal from two shear stress signals through detection and filtering the temporal intensity course of the light power reflected by two Fiber Bragg gratings which are arranged at a separation from one another; and generating a wheel signal if the difference signal exceeds a predetermined shear stress difference limiting value.

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Munich, Germany

Mathias Mueller