Laser hydrophone and virtual array of laser hydrophones

Details Laser hydrophone and virtual array of laser hydrophones Laser hydrophone and virtual array of laser hydrophones

1974-09-19

1996-04-02

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

H04R 2300

Patent

active

055047190

ABSTRACT:
The present invention relates to a hydrophone and to a virtual array of hydrophones for sensing the amplitude, frequency, and in arrays, the direction of sonic waves in water. The hydrophone employs a laser beam which is focused upon a small "focal" volume of water in which natural light scattering matter is suspended and which matter vibrates in synchronism with any sonic waves present. The vibration produces a phase modulation of the scattered light which may be recovered by optical heterodyne and sensitive phase detection techniques. The sonic waves are sensed at locations displaced from the focusing lenses. Because of this remote sensing capability, the physical hardware of an array of hydrophones may be confined to a small area comparable to the dimensions of the lenses themselves while the sensing of the sonic waves virtually occurs at widely spaced, remote focal volumes. Thus, by combining the signals from these remote focal volumes, a virtual array of hydrophones may be formed whose dimensions are large enough in relation to the sonic wavelengths of interest to achieve high directionality but without the penalties of hydrodynamic drag usually associated with large area arrays.

REFERENCES:
patent: 3278753 (1966-10-01), Pitts et al.
patent: 3474253 (1969-10-01), Kessler
patent: 3866055 (1975-02-01), Pike
patent: 4155065 (1979-05-01), Stimler
patent: 5175713 (1992-12-01), Ballard
Time-Resolved Photoelectric Interferometry Of Very High Phase Resolution, K. K. Von Willisen (Brown-Boveri, Switzerland, OSA Meeting 1968).
Measurement Of Vibrations Using Lasers, H. Avsec, Q. Davis, Decca Radar, Ltd. Surrey, England, Clea Conference 1969.

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