Publications de Dragan Coric | EPFL Graph Search

An experimental-numerical study of moisture absorption in an epoxy

Joël Cugnoni, John Botsis, Dragan Coric, Marco Lai

It is well known that moisture absorption impairs the mechanical and physical properties of polymers. Conventionally, the material's hygric strains are described as the product of a constant coefficient of moisture expansion (CME) and moisture concentratio ...

2012

Monitoring of non-homogeneous strains in composites with embedded wavelength multiplexed fiber Bragg gratings: A methodological study

John Botsis, Samuel Stutz, Dragan Coric

For the detection of problems like fastening failures and delamination in composites, the employment of embedded fiber Bragg grating (FBG) sensors is considered an effective tool to measure non-homogeneous internal strains near damage or interfaces of diss ...

2012

High-speed internal strain measurements in composite structures under dynamic load using embedded FBG sensors

Joël Cugnoni, Thomas Gmür, John Botsis, Jeannot Frieden, Dragan Coric

Internal strain measurements in cross-ply carbon-epoxy composite plates under dynamic loads are carried out using embedded FBG sensors. The principle of the FBG interrogation is based on intensity demodulation achieved via a Fabry-Perot filter. To account ...

2010

Distributed strain measurements using fiber Bragg gratings in small-diameter optical fiber and low-coherence reflectometry

Hans Georg Limberger, John Botsis, Dragan Coric, Marco Lai, Aiping Luo

Optical low coherence reflectometry and fiber Bragg gratings written in small diameter (50 micrometer) optical fibers were used for measurements of non-homogenous internal strain fields inside an epoxy specimen with sub-grating length resolution. The resul ...

Optical Society of America2010

Internal strain measurements in CFRP plates subjected to impact load using FBG sensors

Joël Cugnoni, Thomas Gmür, John Botsis, Jeannot Frieden, Dragan Coric

The British Composites Society2009

On the degree of conversion and coefficient of thermal expansion of a single fiber composite using a FBG sensor

Joël Cugnoni, John Botsis, Dragan Coric, Marco Lai

The increasing needs of extending the lifetime in high-technology fields, such as space and aerospace, rail transport and naval systems, require quality enhancing of the composite materials either from a processing standing point or in the sense of resista ...

Amer Inst Physics, 2 Huntington Quadrangle, Ste 1No1 D, Melville, Ny 11747-4501 Usa2008

Characterization of dynamic response of composite plates with embedded FBG sensors

Joël Cugnoni, Thomas Gmür, John Botsis, Jeannot Frieden, Dragan Coric

University of Dayton Press2008

Distributed sensing using polarization sensitive optical low-coherence reflectometry and fiber gratings

Dragan Coric

Optical low coherence reflectometry (OLCR) is non-destructive interferometric technique that allows measuring amplitude and phase of the light reflected from the device under test. OLCR is a powerful tool for the characterization of the various optical dev ...

EPFL2007

Light-controlled reconfigurable fiber bragg gratings written in attenuation fiber

Hans Georg Limberger, René Salathé, Rodrigue Chatton, Yari Luchessa, Dragan Coric

A novel type of light controlled fiber Bragg gratings written in attenuation fiber is demonstrated. The spectral reconfiguration can be controlled by the pump power, the pumping configuration, the grating position and the fiber attenuation. © Optical Socie ...

Institute of Electrical and Electronics Engineers Computer Society2007

Distributed measurements of fiber birefringence and diametric load using optical low-coherence reflectometry and fiber gratings

Hans Georg Limberger, René Salathé, Dragan Coric

Optical Society of America2006

High resolution liquid-level sensor based on fiber Bragg gratings in attenuation fiber and optical low-coherence reflectometry

Hans Georg Limberger, René Salathé, Rodrigue Chatton, Dragan Coric

2006

Direct measurement of fiber Bragg grating local birefringence using optical low coherence reflectometry

Hans Georg Limberger, René Salathé, Dragan Coric

Optical low coherence reflectometry (OLCR) was used for the measurement of the local fiber Bragg grating (FBG) birefringence. The birefringence with resolution of 4 x 10(-6) was determined directly from oscillations in the OLCR amplitude with a spatial res ...

2005

Distributed sensing of diametric load using Optical Low Coherence Reflectometry and fiber Bragg gratings

Hans Georg Limberger, René Salathé, Dragan Coric

2005