Construction of a Fiber Optic Gradient Hydrophone Using a Michelson Configuration.
Abstract
The fabrication and testing of a Michelson interferometric pressure gradient fiber optic hydrophone is described. The ten meter sensing fibers, wound on teflon mandrels were found to have individual coil sensitivities of .64 + or - 0.8 rad/Pa in the frequency range of 125 to 560 Hz. This value was a factor of twenty greater than expected based on the elastic properties of the teflon mandrels and this discrepancy is currently under investigation. The differential coil pairs exhibited the typical dipolar directionality pattern and the gradient sensitivity was consistent with the individual coil sensitivities. A discussion of gradient sensor behavior of an unbalanced dipole in both standing and traveling wave fields is included. Keywords: Theses fiber optics; Pressure gradient hydrophone; Michelson interferometer; Fiber optic sensors; Dipole; and Unbalanced dipole.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 27, 1986
- Accession Number
- ADA167892
Entities
People
- Peggy A. Feldman
Organizations
- Naval Postgraduate School