منابع مشابه
Design Considerations for a Dfb Fibre Laser Based High Sensitivity Broadband Hydrophone
Over the last three decades extensive research has been carried out towards the design and development of fibre optic hydrophones. The inherent advantages of fibre optic sensing technology, like high sensitivity, immunity to electromagnetic interference, intrinsic safety to water leakage, remote measurement capability etc. makes it an ideal choice for underwater acoustic sensing[1, 2]. The init...
متن کاملPassive geoacoustic inversion with a single hydrophone using broadband ship noise.
An inversion scheme is proposed, relying upon the inversion of the noise of a moving ship measured on a single distant hydrophone. The spectrogram of the measurements exhibits striations which depend on waveguide parameters. The periodic behavior of striations versus range are used to estimate the differences of radial wavenumber between couples of propagative modes at a given frequency. These ...
متن کاملPhase calibration of hydrophones: heterodyne time-delay spectrometry and broadband pulse technique using an optical reference hydrophone
Two hydrophone calibration techniques are presented which provide amplitude and phase of hydrophone sensitivity. Heterodyne time-delay spectrometry can be applied in the frequency range from 0.5 to 50 MHz to all common hydrophones but needs a standard to obtain absolute values. A pulse technique between 1 and 70 MHz allows exploiting of an optical multilayer hydrophone as a phase standard. In c...
متن کاملLinearization technique using bipolar transistor at 5GHz lownoise amplifier
Article history: Received 18 February 2009 Accepted 16 July 2009
متن کاملDual polarization fiber grating laser hydrophone.
A novel fiber optic hydrophone based on the integration of a dual polarization fiber grating laser and an elastic diaphragm is proposed and experimentally demonstrated. The diaphragm transforms the acoustic pressure into transversal force acting on the laser cavity which changes the fiber birefringence and therefore the beat frequency between the two polarization lines. The proposed hydrophone ...
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ژورنال
عنوان ژورنال: The Journal of the Acoustical Society of America
سال: 1971
ISSN: 0001-4966
DOI: 10.1121/1.1977678