We present a compact and fast wavelength monitor capable of resolving pm wavelength changes. A photosensor array or position detector element is coated with a linear variable filter, which converts the wavelength information of the incident light into a spatial intensity distribution on the detector. Differential read-out of two adjacent elements of the photosensor array or the position detector is used to determine the centroid of this distribution. A wavelength change of the incident light is detected as a shift of the centroid of the distribution. The performance of this wavelength detector was tested with a wavelength tunable light source. We have demonstrated that our device is capable of detecting wavelength changes as small as ~0.1 pm. The wavelength monitor can be used as read-out unit for any optical sensor that produces a wavelength shift in response to a stimulus. In particular, changes in the reflection properties of one and two-dimensional photonic crystals can been detected. The performance of this interrogation method has been tested for the case of temperature and strain sensors based on Fiber Bragg Gratings (FBG).


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    Titel :

    Compact and fast interrogation unit for fiber Bragg grating sensors


    Beteiligte:
    Kiesel, Peter (Autor:in) / Beck, Markus (Autor:in) / Schmidt, Oliver (Autor:in) / Johnson, Noble (Autor:in) / Bassler, Michael (Autor:in) / Ecke, Wolfgang (Autor:in) / Schroeder, Kerstin (Autor:in) / Bartelt, Hartmut (Autor:in)

    Kongress:

    Photonics in the Transportation Industry: Auto to Aerospace ; 2007 ; Boston,MA,United States


    Erschienen in:

    Erscheinungsdatum :

    26.09.2007





    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



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