An improved spectrophone for measurements of laser absorption in gases has been tested. The device employs a fiber-optic interferometer, wound into a cylindrical shape, as the acoustic sensor. Performance of the device was evaluated by measuring the absorption of 3.39 μm HeNe laser radiation in a calibrated mixture of methane in Argon. Results indicate a minimum detectable absorption capability of 2x10-7cm-1 W/√ MHz , although a background signal 30 dBV above the noise limited performance. We report an improvement in sensitivity several orders of magnitude above the first fiber-optic spectrophone.


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    Title :

    A Sensitive Fiber-Optic Gas Spectrophone


    Contributors:

    Conference:

    Fiber Optic and Laser Sensors I ; 1983 ; Arlington,United States


    Published in:

    Publication date :

    1983-09-19





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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