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Proceedings Paper

Fiber Optic Gradient Hydrophone
Author(s): Gary B. Mills; Steven L. Garrett; Edward F. Carome
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Paper Abstract

A laboratory study has been made of the characteristics of an interferometric type optical fiber pressure gradient hydrophone. The optical system is configured as an all fiber Mach-Zehnder interferometer excited by a single mode gallium arsenide diode laser. A pair of identical fiber coils, one in each arm of the interferometer, forms the sensing portion of the gradient hvdrophone. Each coil consists of 10 meters of polyethylene jacketed, single mode fiber, wound in a toroidal element of mean diameter 4 cm and thickness 3 mm. A standing wave type acoustic calibrator was constructed and used to determine the sensitivity of each individual coil. The pair then was aligned coaxially and separated by 10 cm to operate as a pressure gradient device. Details of the construction of the system, calibration procedure, and hydrophone sensitivity data are presented.

Paper Details

Date Published: 17 September 1984
PDF: 6 pages
Proc. SPIE 0478, Fiber Optic and Laser Sensors II, (17 September 1984); doi: 10.1117/12.942674
Show Author Affiliations
Gary B. Mills, Naval Postgraduate School (United States)
Steven L. Garrett, Naval Postgraduate School (United States)
Edward F. Carome, Naval Postgraduate School (United States)

Published in SPIE Proceedings Vol. 0478:
Fiber Optic and Laser Sensors II
Emery L. Moore; O. Glenn Ramer, Editor(s)

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