Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1999-02-19
2000-03-07
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
H04R 144
Patent
active
060349247
ABSTRACT:
A folded Sagnac fiber optic acoustic sensor array operates in a manner similar to a Sagnac interferometer but uses a common delay path to reduce distributed pickup in downlead fibers. The fiber optic acoustic sensor array is used to detect acoustic waves in water. By basing the folded Sagnac sensor array on operating principles similar to the Sagnac interferometer rather than basing the array on a Mach-Zehnder interferometer, the sensor array has a stable bias point, has reduced phase noise, and allows a broadband signal source to be used rather than requiring a more expensive narrowline laser. A large number of acoustic sensors can be multiplexed into the architecture of the folded Sagnac fiber optic acoustic array.
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Pihulic Daniel T.
The Board of Trustees of the Leland Stanford Junior Univerisity
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