Four step discrete phase shift demodulation method for fiber...

Details Four step discrete phase shift demodulation method for fiber... Four step discrete phase shift demodulation method for fiber...

G - Physics

08

C

G08C 23/06 (2006.01) G01J 9/02 (2006.01) G01N 21/17 (2006.01)

Patent

CA 2315591

A sinusoidal phase generated carrier is used to demodulate signal output from an interferometric sensor array. Optical signals input to the array are modulated with a sinusoid. Output signals are sampled and integrated over portions of a period of the phase generated carrier. A key to this method of sampling is the existence of pairs of signals associated with integration over two 180° out-of-phase portions of the phase generated carrier. This invention is a four step method involves the implementation of two pairs of such signals to determine the phase shift in each sensor in the array.

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