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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 31 — Nov. 1, 2009
  • pp: G77–G82

Thin film metal coated fiber optic hydrophone probe

Rupa Gopinath Minasamudram, Piyush Arora, Gaurav Gandhi, Afshin S. Daryoush, Mahmoud A. El-Sherif, and Peter A. Lewin  »View Author Affiliations


Applied Optics, Vol. 48, Issue 31, pp. G77-G82 (2009)
http://dx.doi.org/10.1364/AO.48.000G77


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Abstract

Our purpose is to improve the performance sensitivity of a fiber sensor used as a fiber optic hydrophone probe (FOHP) by the addition of nanoscale thin film gold coating. The fiber is designed to provide a uniform and spatial averaging free response up to 100 MHz by etching down to an active diameter of approximately 9 μm . The performance sensitivity of straight cleaved (i.e., full size core and cladding) uncoated, tapered uncoated, and tapered thin film gold-coated fiber sensors was compared in the frequency range from 1.5 to 20 MHz in the presence of acoustic amplitude pressure levels as high as 6 MPa . An unprecedented voltage sensitivity of 245 dB relative to 1 V / μ Pa ( 560 mV / MPa ) was measured for a thin film gold-coated FOHP by optimizing the gold coating thickness.

© 2009 Optical Society of America

OCIS Codes
(060.2280) Fiber optics and optical communications : Fiber design and fabrication
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(170.3890) Medical optics and biotechnology : Medical optics instrumentation
(170.7170) Medical optics and biotechnology : Ultrasound
(310.6860) Thin films : Thin films, optical properties
(170.1065) Medical optics and biotechnology : Acousto-optics

History
Original Manuscript: June 19, 2009
Revised Manuscript: September 16, 2009
Manuscript Accepted: September 16, 2009
Published: October 2, 2009

Virtual Issues
Vol. 4, Iss. 13 Virtual Journal for Biomedical Optics

Citation
Rupa Gopinath Minasamudram, Piyush Arora, Gaurav Gandhi, Afshin S. Daryoush, Mahmoud A. El-Sherif, and Peter A. Lewin, "Thin film metal coated fiber optic hydrophone probe," Appl. Opt. 48, G77-G82 (2009)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-48-31-G77


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References

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  16. K. Srinivasan, “Noise cancelled optical receivers in fiber optic hydrophone up to 100 MHz,” M.S. thesis (Drexel University, 2007).

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