Design and development of a fiber optic acoustic hydrophone

• Main Author: Lin, Ying.
• Other Authors: Lim, Tuan Kay
• Format: Theses and Dissertations
• Language: English
• Published: 2009
• Subjects: DRNTU::Engineering::Electrical and electronic engineering::Optics, optoelectronics, photonics
• Online Access: http://hdl.handle.net/10356/19638
• Institution: Nanyang Technological University

An all-fiber-optic hydrophone has been designed, constructed and tested. The fiber system consists of a sensing interferometer and a compensating interferometer with optical path length compensation. The compensating interferometer contains an optical frequency shifter in one of its arms to enable a heterodyne detection and it compensates the optical path length difference caused by the long arm of the sensing interferometer. As a result, the new system configuration offers some unique advantages. The hydrophone is a true heterodyne device. The compensating interferometer is located near the electronics module and is shielded from acoustic interference. The sensing interferometer is completely passive and is remotely located.