Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1986-06-23
1988-09-13
Willis, Davis L.
Optics: measuring and testing
By particle light scattering
With photocell detection
250227, G01B 902
Patent
active
047705353
ABSTRACT:
A distributed sensor system using pulsed optical signals optionally produced by a short coherence length source to provide a phase difference output signal representative of conditions affecting a selected sensor. In one preferred embodiment, an array of fiber-optic sensors are organized in a ladder configuration, with the sensors positioned in spaced relation and defining the rungs of the ladder. Light pulses transmitted through the sensors are multiplexed onto a return arm of the ladder. The multiplexed signals are received by an optical fiber compensating interferometer which coherently couples portions of adjacent multiplexed light signals to produce a phase difference signal representing conditions influencing selected sensors. In other preferred embodiments, the system is configured to define a plurality of adjacent Mach-Zehnder interferometers which provide output signal pairs which coherently couple to yield a phase difference signal directly representing the environmental effects on a particular sensor. Functional equivalents of the Mach-Zehnder interferometer configurations comprise configurations including adjacent Michelson interferometers. A phase and amplitude modulation technique is disclosed for providing heterodyned output signals from the distributed sensor system.
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Brooks Janet L.
Fesler Kenneth A.
Kim Byoung Y.
Shaw Herbert J.
Tur Moshe
Koren Matthew W.
The Board of Trustees of the Leland Stanford Junior University
Willis Davis L.
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