Publication

An optical fibre sensor for dynamic deformation measurements based on the intensity modulation of a low-coherence source

Luc Thévenaz, Pramod Rastogi, Sandra Lloret Barrera
2003
Journal Articles

Abstract

An optical fibre sensing technique for the measurement of dynamic deformations using a Michelson interferometer is reported. The method applied to interferometers with an initial path unbalance of around 1 cm is based on the rf intensity modulation of a low-coherence source. A large measurement range of 1 cm is intrinsic to the method and with an adequate demodulation process sensitivity better than 10 μm is obtained. This novel approach allows for measuring dynamic deformations with a bandwidth up to 100 Hz.

Official source

https://infoscience.epfl.ch/entities/publication/4cb809ea-54ec-46bf-ae83-4c0e5d6d6812

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Luc Thévenaz, Pramod Rastogi, Sandra Lloret Barrera
2003
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/4cb809ea-54ec-46bf-ae83-4c0e5d6d6812

About this result

Related concepts (29)

Interferometry

Interferometry is a technique which uses the interference of superimposed waves to extract information. Interferometry typically uses electromagnetic waves and is an important investigative technique in the fields of astronomy, fiber optics, engineering metrology, optical metrology, oceanography, seismology, spectroscopy (and its applications to chemistry), quantum mechanics, nuclear and particle physics, plasma physics, biomolecular interactions, surface profiling, microfluidics, mechanical stress/strain measurement, velocimetry, optometry, and making holograms.

Optical fiber

An optical fiber, or optical fibre in Commonwealth English, is a flexible, transparent fiber made by drawing glass (silica) or plastic to a diameter slightly thicker than that of a human hair. Optical fibers are used most often as a means to transmit light between the two ends of the fiber and find wide usage in fiber-optic communications, where they permit transmission over longer distances and at higher bandwidths (data transfer rates) than electrical cables.

Coherence (physics)

In physics, coherence expresses the potential for two waves to interfere. Two monochromatic beams from a single source always interfere. Physical sources are not strictly monochromatic: they may be partly coherent. Beams from different sources are mutually incoherent. When interfering, two waves add together to create a wave of greater amplitude than either one (constructive interference) or subtract from each other to create a wave of minima which may be zero (destructive interference), depending on their relative phase.

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An optical fibre sensor for dynamic deformation measurements based on the intensity modulation of a low-coherence source

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