Optics: measuring and testing – By light interference – Using fiber or waveguide interferometer
Reexamination Certificate
2011-04-05
2011-04-05
Chowdhury, Tarifur (Department: 2886)
Optics: measuring and testing
By light interference
Using fiber or waveguide interferometer
Reexamination Certificate
active
07920270
ABSTRACT:
An apparatus for interferometric sensing, comprising a plurality of single-longitudinal mode laser sources to each provide radiation at a corresponding plurality of selected wavelengths, and at least one modulator to frequency or phase modulate the radiation from each laser; a plurality of Fabry-Perot interferometers formed by Bragg Gratings written into optical fibre, each interferometer being responsive to one of the said plurality of wavelengths to each produce a reflected or transmitted optical output signal dependent on the corresponding interferometer path length; and one or more demodulators to demodulate the optical output signals and produce a corresponding plurality of measurement signals indicative of optical path lengths of the respective interferometers.
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Chow Jong H.
Gray Malcolm B.
McClelland David E.
Chowdhury Tarifur
Cook Jonathon D
Hamilton Brook Smith & Reynolds P.C.
The Australian National University
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