Complementary Interferometric Hydrophone.
Patent, Filed 27 Sep 82, patented 17 Jan 89,
DEPARTMENT OF THE NAVY WASHINGTON DC
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A cylindrical interferometric hydrophone having an axial hollow free-flooded volume includes an outer fiber wrap for a sensor leg and an inner fiber wrap for a reference leg. Both inner and outer fiber wraps are wound on elastomers and exposed to seawater for sensing acoustic signals. In operation an increased pressure shortens the outer wrap and lengthens the inner wrap. The use of both the sensor and the reference legs to detect signals gives increased sensitivity. Keywords Optical hydrophones Fiber optics Filament wound construction. Patents. edc
- Acoustic Detection and Detectors
- Fiber Optics and Integrated Optics