Method and apparatus for acoustic sensing using multiple...

Details Method and apparatus for acoustic sensing using multiple... Method and apparatus for acoustic sensing using multiple...

2007-10-03

2010-06-22

Chowdhury, Tarifur (Department: 2886)

Optics: measuring and testing

For optical fiber or waveguide inspection

C356S484000, C385S012000, C385S013000

Reexamination Certificate

active

07742157

ABSTRACT:
An improved technique for acoustic sensing involves, in one embodiment, launching into a medium, a plurality of groups of pulse-modulated electromagnetic-waves. The frequency of electromagnetic waves in a pulse within a group differs from the frequency of the electromagnetic waves in another pulse within the group. The energy scattered by the medium is detected and, in one embodiment, the beat signal may be used to determine a characteristic of the environment of the medium. For example, if the medium is a buried optical fiber into which light pulses have been launched in accordance with the invention, the presence of acoustic waves within the region of the buried fiber can be detected.

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