Four step discrete phase shift demodulation method for fiber opt

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

1999-07-30

2000-09-19

Kim, Robert H.

Optics: measuring and testing

By particle light scattering

With photocell detection

356359, G01B 902

Patent

active

061220574

ABSTRACT:
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.degree. 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.

REFERENCES:
patent: 5748314 (1998-05-01), Kitayoshi
I.J. Bush and D. R. Sherman, High Performance Interferomtric Demodulation Techniques, SPIE vol. 1795 Fiber Optic and Laser Sensors X, pp. 412-420, (1992) USA.

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