G - Physics – 01 – D
Patent
G - Physics
01
D
73/53
G01D 5/26 (2006.01) G01D 5/353 (2006.01)
Patent
CA 1296919
DISTRIBUTED SENSOR ARRAY AND METHOD USING A PULSED SIGNAL SOURCE ABSTRACT OF THE DISCLOSURE 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-optical 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 coheretly 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 configuration including adjacent modulation interferometers. A phase and amplitude modulation technique and apparatus (Figure 8) is disclosure for providing heterodyned output signals from the distributed sensor system. abstract
540243
Brooks Janet L.
Fesler Kenneth A.
Kim Byoung Yoon
Shaw Herbert John
Tur Moshe
Gowling Lafleur Henderson Llp
The Board Of Trustees Of The Leland Stanford Junior University
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