An optical fiber strainmeter intended for measuring tectonic strains on the seafloor is under development. In this instrument, an optical fiber is stretched between two points fixed to the ocean bottom; relative displacement of these points causes a change in the elongation of the fiber. This associated change in optical path length is monitored by an electronic distance meter. The dominant sources of noise in determining the optical path length of the fiber stem from the dependence of the fiber's index of refraction on both wavelength and temperature. In a 50 day long experiment performed in the shallow ocean, a test fiber was installed along a 210 m long baseline on the bottom. The RMS variation in length was 5 mm except for two displacements of order 10 cm caused by known effects.


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    Titel :

    Precise optical path length measurement through an optical fiber: Application to seafloor strain monitoring


    Weitere Titelangaben:

    Ein präzises faseroptisches Weglängenmeßverfahren: Anwendung zur Seebebenüberwachung


    Beteiligte:
    Zumberge, M.A. (Autor:in)

    Erschienen in:

    Ocean Engineering ; 24 , 6 ; 531-542


    Erscheinungsdatum :

    1997


    Format / Umfang :

    12 Seiten, 8 Bilder, 12 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




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