FIBER-OPTIC HYDROPHONE: IMPROVED STRAIN CONFIGURATION AND ENVIRONMENTAL NOISE PROTECTION

Authors
  1. Cielo, P.G.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
It is shown that the pressure sensitivity of a fiber-optic hydrophone is strongly dependent on the fiber's strain configuration. Longitudinal strain is found to be much more effective than uniform strain, and consequently modifications to the sensor's design are proposed. Environmental noise sources such as ocean motion and mechanical vibrations are then discussed, and a new double-cavity configuration which is unaffected by those perturbations is presented. A tunable-cavity detection method is finally considered, and it is shown how this method can overcome problems related to drift of the point of operation, laser intensity fluctuations, and nonlinearity for high dynamic ranges.
Report Number
DREA-79-1 —
Date of publication
15 Dec 1979
Number of Pages
8
Reprinted from
Applied Optics, vol 18, no 17, 1979, p 2933-2937
DSTKIM No
80-00644
CANDIS No
88346
Format(s):
Hardcopy;Originator's fiche received by DSIS

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