Distributed acoustic sensor

Details Distributed acoustic sensor Distributed acoustic sensor

H - Electricity

04

R

H04R 23/00 (2006.01) G01B 9/02 (2006.01) G01H 9/00 (2006.01) G01V 1/00 (2006.01) G01V 1/18 (2006.01) G01V 1/20 (2006.01) G08G 1/00 (2006.01)

Patent

CA 2160360

A distributed acoustic sensor (10) utilizing a Fizeau type fiber optic transducer and a distributed acoustic collector (30) to gather and return acoustic disturbances from remote areas in buried, underground, or underwater installations. A light beam from a laser or LED source (11) is transmitted over a fiber (13) to a remote transducer (20) which is coupled to a distributed acoustic collector (30). The collector (30) may be an extended pipe or tube system filled with an acoustic conducting medium such as air or an appropriate liquid which communicates with the sensing diagram in the transducer (20). An interference beam whose characteristics are a function of the diaphragm motion is created in the transducer (20) and transmitted over the common single fiber (15) toward the source (11). An in-line optical coupler/splitter (12) diverts a portion of the returning modulated beam to a photodetector (16) which outputs a proportional electrical signal to an electronic circuit (17) for amplification and analysis.

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