All fiber towed array

摘要

A system and method for an acoustic sensor array of a bundle of N different length optical fiber sensors. A coherent or noncoherent light source is input to each fiber for transmission along the length of the fiber. The light signal is reflected back at the fiber end point, and the resulting reflected light is diverted to an optical receiver so that perturbations of intensity and/or phase may be extracted.

主权项

1. A passive acousto-optical sensor system comprising:
a plurality of at least partially overlapping optical fibers of differing lengths each configured to sense an acoustic signal along its length; a receiver operatively connected to the plurality of optical fibers; and a processor operatively connected to the receiver and configured to:
subtract an output optical signal of a first optical fiber of the plurality of optical fibers from an output optical signal of a second optical fiber of the plurality of optical fibers, wherein the plurality of optical fibers comprise a predetermined non-zero number of optical fibers whose lengths are intermediate the lengths of the first and second optical fibers, for extracting the acoustic signal associated with the portion of the second optical fiber that does not overlap with the first optical fiber; andalter an operating frequency of the system by changing the predetermined non-zero number of optical fibers having lengths intermediate the lengths of optical fibers to be subtracted.