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The frequency-dependent directivity of a planar fabry-perot polymer film ultrasound sensor

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2 Author(s)
Cox, B.T. ; Dept. of Med. Phys. & Bioeng., Univ. Coll. London ; Beard, P.C.

A model of the frequency-dependent directivity of a planar, optically-addressed, Fabry-Perot (FP), polymer film ultrasound sensor is described and validated against experimental directivity measurements made over a frequency range of 1 to 15 MHz and angles from normal incidence to 80deg. The model may be used, for example, as a predictive tool to improve sensor design, or to provide a noise-free response function that could be deconvolved from sound-field measurements in order to improve accuracy in high-frequency metrology and imaging applications. The specific question of whether effective element sizes as small as the optical-diffraction limit can be achieved was investigated. For a polymer film sensor with a FP cavity of thickness d, the minimum effective element radius was found to be about 0.9d, and that an illumination spot radius of less than d/4 is required to achieve it

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Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on  (Volume:54 ,  Issue: 2 )