Aperture intensity ratio fiber-optic displacement sensor

Darold Wobschall, Shahram Hejazi

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


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 languageEnglish (US)
Pages (from-to)1543-1544
Number of pages2
JournalReview of Scientific Instruments
Issue number8
StatePublished - 1987
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Instrumentation


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