Thin film metal coated fiber optic hydrophone probe
Applied Optics, Vol. 48, Issue 31, pp. G77-G82 doi:10.1364/AO.48.000G77
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- 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
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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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/μPa (560 mV/MPa) was measured for a thin film gold-coated FOHP by optimizing the gold coating thickness.
© 2009 Optical Society of America
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History
Original Manuscript: June 19, 2009
Manuscript Accepted: September 16, 2009
Revised Manuscript: September 16, 2009
Published: October 2, 2009
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Author Affiliations
Drexel University
Photonics Laboratories, Incorporated
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