Patent ID: 8264692
Filing Date: 2012-09-11
Classification: G01H

Abstract:
1. A fiber optic sensor array, comprising: a first coherent optical signal source that produces an optical signal of wavelength λ a first optical fiber in optical communication with the first coherent optical signal source to guide the optical signal of wavelength λ a second coherent optical signal source that produces an optical signal of wavelength λ a second optical fiber in optical communication with the second coherent optical signal source to guide the optical signal of wavelength λ an input wavelength division multiplexer connected to the first and second optical fibers to receive the optical signals of λ a signal transmission optical fiber connected to the input wavelength division multiplexer to guide optical signals of both wavelengths λ an array of two-wavelength Fabry-Perot interferometric sensors coupled to the signal transmission optical fiber to receive optical signals of wavelengths λ an optical on-off switch connected between the input wavelength division multiplexer and the array of Fabry-Perot interferometric sensors to control transmission of optical signals through the signal transmission optical fiber; a time division multiplexed architecture connected to the optical switch wherein a plurality of optical couplers couple a corresponding plurality of two wavelength Fabry-Perot interferometric sensors to the signal transmission fiber and an output wavelength division multiplexer arranged to divide optical signals output from the plurality of Fabry-Perot interferometric sensors into a first output signal having wavelength λ a detector array coupled to the output wavelength division multiplexer to produce electrical signals in response to the interferometer output signals; a signal processor connected to the detector array for processing the electrical signals from the detector array to indicate pressure from the acoustic pressure wave.