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Miniature optical fibre ultrasonic hydrophone using a Fabry-Perot polymer film interferometer

Miniature optical fibre ultrasonic hydrophone using a Fabry-Perot polymer film interferometer

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An optical fibre hydrophone for the measurement and detection of ultrasound is described. The active sensing element consists of a low finesse Fabry-Perot polymer film interferometer bonded to the tip of an optical fibre, of 50 µm core diameter and 0.25 mm outer diameter. Sensitivity was found to be 114 mV/MPa with an acoustic noise floor of 15 kPa over a 25 MHz bandwidth.

References

    1. 1)
      • J.J. Alcoz , C.E. Lee , H.F. Taylor . Embedded fibre-optic Fabry-Perot ultrasound sensor. IEEE Trans. Ultrason., Ferroelectr. Freq. Control , 4 , 302 - 305
    2. 2)
      • P.A. Lewin , M.C. Ziskin , P.A. Lewin . (1993) Practical implementations and technology of measurement devices, Ultrasonic Exposimetry.
    3. 3)
      • P.C. Beard , T.N. Mills . An optical fibre sensor for the detection of laser generated ultrasoundin arterial tissues. Proc. SPIE - Int. Soc. Opt. Eng. , 112 - 122
    4. 4)
      • J.F. Dorighi , S. Krishnaswamy , J.D. Achenbach . Stabilisation of an embedded fibre optic Fabry-Perot sensor for ultrasounddetection. IEEE Trans. Ultrason., Ferroelectr. Freq. Control , 5 , 820 - 824
    5. 5)
      • P.C. Beard , T.N. Mills . Extrinsic optical fibre ultrasound sensor using a thin polymer film asa low finesse Fabry-Perot interferometer. Appl. Opt. , 4 , 663 - 675
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