Thin film metal coated fiber optic hydrophone probe

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 diamete...

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Bibliographic Details
Published in:Applied optics. Optical technology and biomedical optics 2009-11, Vol.48 (31), p.G77
Main Authors: Gopinath Minasamudram, Rupa, Arora, Piyush, Gandhi, Gaurav, Daryoush, Afshin S, El-Sherif, Mahmoud A, Lewin, Peter A
Format: Article
Language:English
Subjects:
Equipment Design
Equipment Failure Analysis
Fiber Optic Technology - instrumentation
Gold - chemistry
Image Enhancement - instrumentation
Membranes, Artificial
Reproducibility of Results
Sensitivity and Specificity
Transducers
Ultrasonography - instrumentation
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Summary: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 mum. 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/muPa (560 mV/MPa) was measured for a thin film gold-coated FOHP by optimizing the gold coating thickness.
ISSN:2155-3165
DOI:10.1364/AO.48.000G77