Summary form only given. Laser-based ultrasound is a promising technique for remote ultrasonic inspection. One approach for the measurement of small ultrasonic surface displacements uses dynamic holography in a photorefractive material to combine a distorted signal beam with a plane-wave reference beam and match their wavefronts for homodyne detection. Slow variations in the wavefront of the signal beam are compensated by the real-time hologram and thus do not produce noise or interfere with the quality of the wavefront overlap in the output beams.


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    Title :

    Homodyne detection of ultrasonic surface displacements using two-wave mixing in photorefractive polymers


    Contributors:


    Publication date :

    1999-01-01


    Size :

    162072 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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