Patent ID: 9009003
Filing Date: 2015-04-14
Classification: G01D

Abstract:
1. An assembly for reducing or elimination polarization inducted fading in an optical interferometric sensing network, comprising: an optical source for introducing an optical signal into said network; a reference optical path and a sensing optical path each connected at an input to said optical source for transmitting said optical signal, said sensing optical path comprising at least one Bragg grating; a coupler for combining an optical signal from said reference optical path and an optical signal from said sensing optical path; a detector for converting said combined optical signal into at least one electrical signal, said detector further comprising a switch for selectively connecting at least said first electrical signal or said second electrical signal to a signal acquisition and processing unit; a signal acquisition and processing unit electrically connected to said switch, said acquisition and processing unit comprising an analog-to-digital signal converter, a digital processor and digital memory; and a timing control signal generator for synchronizing a position of said switch with said introduction of said optical signal by said optical source.