Normalization method for fiber optic sensor system

Details Normalization method for fiber optic sensor system Normalization method for fiber optic sensor system

1999-05-10

2000-10-17

Turner, Samuel A.

Optics: measuring and testing

By light interference

Using fiber or waveguide interferometer

25022727, G01B 902

Patent

active

061340154

ABSTRACT:
Quadrature signals Q and in-phase signals I output from a pathlength mismatched interferometric sensor are normalized sampling the signals to obtain a first set of values Q.sub.k =Q.sub.0 B.sub.k sin .phi..sub.k corresponding to the sine of the phase shift and a second set of values I.sub.k =I.sub.0 B.sub.k cos .phi..sub.k corresponding to the cosine of the phase shift where k is a running index of the set of consecutive samples of Q and I. A quantity DQ.sub.k =.vertline.(Q.sub.u(k)).sup.2 -(Q.sub.s(k)).sup.2 .vertline. is calculated for the quadrature signals; and a quantity DI.sub.k =.vertline.(I.sub.u(k)).sup.2 -(I.sub.s(k)).sup.2 .vertline. is calculated for the in-phase signals, where u(k) and s(k) are parameters used to determine indices that select specific sampled signals and k is a running index of the set of consecutive samples of Q and I. The normalization factor is then calculated as the ratio R=Q.sub.N /I.sub.N where ##EQU1##

REFERENCES:
patent: 5173743 (1992-12-01), Kim
patent: 5227857 (1993-07-01), Kersey

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