Low Flow-Noise Conformal Fiber Optic Hydrophone.
Patent, Filed 21 Feb 91, patented 18 Aug 92,
DEPARTMENT OF THE NAVY WASHINGTON DC
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A fiber-optic hydrophone having a pair of jacketed fiber optic windings formed in a concentric planar spiral configuration in a layer of polyurethane is provided. One of the fiber optic windings has a fiber with a bonded acoustically sensitive jacket thereby increasing its sensitivity to acoustic energy. The second fiber optic winding, the reference winding, has a unbonded jacket enclosing the fiber resulting in reduced sensitivity to acoustic energy. Sensitivity to vibrational energy however, is not reduced. The combining of signals from the pair of fibers provides a vibration-canceled acoustic signal.
- Acoustic Detection and Detectors
- Acoustooptic and Optoacoustic Devices
- Fiber Optics and Integrated Optics