NDLI: Comparison of a miniature, ultrasonic, optical fibre hydrophone with PVDF hydrophone technology

Content Provider	IEEE Xplore Digital Library
Author	Beard, P.C. Hurrell, A. Van den Elzen, E. Mills, T.N.
Copyright Year	1998
Description	Author affiliation: Dept. of Med. Phys. & Bioeng., Univ. Coll. London, UK (Beard, P.C.)
Abstract	A miniature optical fibre hydrophone has been developed for the measurement of ultrasound in the range 1-30 MHz. The acoustically sensitive element comprises a 23 /spl mu/m thick polymer film mounted at the end of an optical fibre. When illuminated by laser light launched into the fibre, the polymer film acts as a Fabry Perot interferometer. An incident acoustic wave modulates the optical thickness of the interferometer thereby producing a corresponding intensity modulation in the light reflected from the film. The system was characterised in terms of sensitivity, frequency response and directivity using a broadband (1-30 MHz) ultrasonic field produced by nonlinear propagation obtained by driving a 1 MHz PZT source with a high amplitude 1 MHz toneburst. PVDF needle and membrane reference hydrophones were used as comparisons. The minimum detectable acoustic pressure of the optical fibre hydrophone was found to be 10 kPa in a 25 MHz measurement bandwidth with a wideband response to 30 MHz. The -3dB beamwidth at 10 MHz was 60/spl deg/. Such performance is comparable to that achieved with PVDF hydrophone technology, with additional advantages of immunity to EMI, small physical size, a flexible probe-type configuration, robustness and potentially low cost. Among the applications that might benefit from these advantages are single-use applications such as the measurement of industrial CW fields in hostile environments and in vivo measurements of medical ultrasound exposure.
Starting Page	1881
Ending Page	1884
File Size	184976
Page Count	4
File Format	PDF
ISBN	0780340957
ISSN	10510117
DOI	10.1109/ULTSYM.1998.765319
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-10-05
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical fibers Sonar equipment Ultrasonic variables measurement Optical interferometry Acoustic measurements Ultrasonic imaging Polymer films Intensity modulation Optical modulation Optical films
Content Type	Text
Resource Type	Article

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