Multimode fiber optic interferometer sensor: signals correlation properties

Lidiya I. Kosareva; Oleg I. Kotov; Elena M. Kotova; Andrei V. Medvedev; Vladimir M. Nikolaev; Victor V. Filimonov

doi:10.1117/12.347458

5 May 1999 Multimode fiber optic interferometer sensor: signals correlation properties

Lidiya I. Kosareva, Oleg I. Kotov, Elena M. Kotova, Andrei V. Medvedev, Vladimir M. Nikolaev, Victor V. Filimonov

Proceedings Volume 3687, International Workshop on Nondestructive Testing and Computer Simulations in Science and Engineering; (1999) https://doi.org/10.1117/12.347458
Event: International Workshop on Nondestructive Testing and Computer Simulations in Science and Engineering, 1998, St. Petersburg, Russian Federation

Abstract

The fiber optical interferometers (FOI) are widely applied in various measuring systems. They can be used for temperature, pressure, magnetic and electrical fields, acoustic waves measurement. Using of multimode light-guides simplifies an adjustment of optical scheme, reduces the requirements to element basis, allows to lead into fiber more optical power. However signal fading in multimode FOI reduces their practical significance. If the influence on multimode FOI monotonically varies, the behavior of a signal is described by two processes: by fast informative changes of light intensity, connected to a modification of a difference of phases of interfering waves, and slow changes of signal amplitude, defined by a changing of contrast of an interference picture. Then the signal parameters became casual variables.

Citation Download Citation

Lidiya I. Kosareva, Oleg I. Kotov, Elena M. Kotova, Andrei V. Medvedev, Vladimir M. Nikolaev, and Victor V. Filimonov "Multimode fiber optic interferometer sensor: signals correlation properties", Proc. SPIE 3687, International Workshop on Nondestructive Testing and Computer Simulations in Science and Engineering, (5 May 1999); https://doi.org/10.1117/12.347458

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KEYWORDS

Interferometers

Sensors

Signal processing

Multimode fibers

Fiber optics sensors

Coating

Signal detection

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