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
11270058
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.
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Greene Paul L.
Hall David B.
Connolly Patrick
Northrop Grumman Corporation
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