A displacement sensor based on the ratio of fiber-optic light emitted from two fixed position optical fibers into a third, movable fiber connected to a photodetector is described. Square-wave modulated light of opposite phases produces a corresponding square wave at the detector which has zero ac amplitude at the center position and an amplitude proportional to displacement on either side of the detection fiber. A phase-sensitive detector produces a positive dc output voltage for positive displacements and negative for negative displacements.
|Original language||English (US)|
|Number of pages||2|
|Journal||Review of Scientific Instruments|
|State||Published - 1987|
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