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AssigneeFelten & Guilleaume Energietechnik GmbH
InventorsHelmut Federmann, Friedrich K. Levacher, Georg Noack, Anton Kraus
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A device for measuring minute elongations of a light wave conductor is constructed as a light wave conductor-type sensing unit assembled of a series connection of a polarizer, a light coupler, a single polarization preserving, doubly refracting monomode light wave conductor enclosed in an elliptical sheathing and an analyzer. A light beam emitted from a laser diode is coupled via a light wave conducting correction cable to the polarizer and upon passage through the sensing unit is coupled via the light wave conducting connection cable to an optoelectric receiver and the electrical signals are evaluated in an electronic circuit. Changes in phase difference of the exiting light wave resulting from the minute changes in length of the light wave conductor are evaluated and scaled as geometric length units.
A device for measuring minute elongations of a light wave conductor, comprising:
A method of measuring minute elongations of a light wave conductor, comprising the steps of feeding linear polarized light into a polarization preserving, doubly refracting light wave conductor wherein the light wave is shifted by a phase difference d, detecting the light wave exiting from the light wave conductor by an optoelectronic evaluation device wherein a phase difference change resulting from a change of the length of said light wave conductor is evaluated and employed as a measure for the geometric change in length.
Dependencies are inferred from the claim text.