Optics: measuring and testing – By light interference – Using fiber or waveguide interferometer
Reexamination Certificate
2008-03-04
2008-03-04
Connolly, Patrick (Department: 2877)
Optics: measuring and testing
By light interference
Using fiber or waveguide interferometer
C250S227270
Reexamination Certificate
active
07339678
ABSTRACT:
A method and system for providing fast interrogation of a signal received from a fiber optic sensor array using a low drive voltage, by modulating the array signal with a phase generated carrier optical signal having an odd harmonic modulation frequency, sending it to an interferometric system, and demodulating the array signal using a demodulation algorithm that is independent of the phase offset. A detector using direct detection method can be used to determine the signal's phase information. The odd harmonic modulation method allows the selection of a desirable odd harmonic PGC frequency with low drive voltage while providing similar performance of the usual PGC frequency that requires a higher drive voltage.
REFERENCES:
patent: 5283625 (1994-02-01), Bunn, Jr.
patent: 5923030 (1999-07-01), Assard et al.
patent: 6072921 (2000-06-01), Frederick et al.
patent: 6122057 (2000-09-01), Hall
patent: 6134015 (2000-10-01), Hall
patent: 6363034 (2002-03-01), Varnham
patent: 6580314 (2003-06-01), Deus, III et al.
patent: 6600586 (2003-07-01), Hall
patent: 6944231 (2005-09-01), Scrofano
patent: 7081959 (2006-07-01), Waagaard et al.
patent: 2004/0257580 (2004-12-01), Hall
patent: 2005/0007597 (2005-01-01), Hall
Greene Paul L.
Hall David B.
Connolly Patrick
Northrop Grumman Corporation
LandOfFree
Method and system of using odd harmonics for phase generated... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and system of using odd harmonics for phase generated..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and system of using odd harmonics for phase generated... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2815804