This paper proposes the characterization of speckle patterns of multimode fibers in view of
sensing applications and particularly for detection of vibration or seismic activity. Plastic …

In this paper, the interference speckle patterns generated by multimode optical fibers are
described. In our experience two types of interference are present, random interference …

The applications of specklegram analysis techniques have been developed recently. In this
paper, we represent a fiber-optic method to measure the temperature through the analysis of …

A vibration sensing technique using the speckle contrast ratio from a multimode fiber is
introduced. This sensing technique is based on time integration by a CCD camera, from …

We present a fiber-sensing technique that detects the mean-absolute speckle-intensity
variation between the updated and the reference speckle pattern for determining the …

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A method of sensing vibration using detection of changes in the spatial distribution of energy
on the speckle pattern in the output multimode optical fiber is presented and demonstrated …

An optical fiber specklegram sensor interrogation method based on speckle pattern
fragmentation is presented. The acquired specklegram images are divided in a square grid …

We propose and experimentally demonstrate an effective method to reduce far-field speckle
noise in multimode fiber with a short cylindrical piezoelectric transducer (PZT) vibrating in …

A quantitative study of image matching techniques applied to fiber specklegram sensor
analysis is presented. The fiber status is modulated by a microbending transducer, so the …