Apparatus and method for determining ground stability measurements by utilising a distributed optical sensor 12. A first static strain is determined at a location along the length of the distributed optical sensor and detecting a variation in strain at a location caused by an active source. A second static strain is determined at a location after the variation in strain caused by the active source has ended. The difference between the first and second static strains is determined. The detection of variation in strain may be performed by detecting higher frequency variations in strain. The relative strength of the active source may be determined based on the higher frequency variations in strain. The difference between the first and second static strains may be normalised. An indication of ground stability may also be based on a plurality of differences between first and second strains. The active source may be a train and the distributed optical sensor may be associated with train tracks. An interrogator 10 may be optically coupled to the optical fibre and may be configured to transmit and detect optical signals into the and from the optical fibre.


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    Title :

    GROUND SENSING UTILISING ACTIVE SOURCES


    Additional title:

    BODENERFASSUNG UNTER VERWENDUNG AKTIVER QUELLEN
    DÉTECTION DU SOL UTILISANT DES SOURCES ACTIVES


    Contributors:

    Publication date :

    2023-12-13


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    G01H MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES , Messen von mechanischen Schwingungen oder Ultraschall-, Schall- oder Infraschallwellen / B61L Leiten des Eisenbahnverkehrs , GUIDING RAILWAY TRAFFIC



    GROUND SENSING UTILISING ACTIVE SOURCES

    AUSTIN EDWARD / FISHER TOBY / DESBRUSLAIS STEPHEN et al. | European Patent Office | 2022

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