Directed Illumination by Side-Emitting Fibers With Trilobal Cross Section

Bunge, Christian-Alexander; Kallweit, Jan; Houri, Mohmmed Al; Gries, Thomas; Mohr, Benjamin

doi:10.1109/jlt.2019.2938570

Cited by 3 publications

(3 citation statements)

References 14 publications

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“…Since many rays would not have been guided by the probe fibre—in particular for large tilting angles

—a certain amount of scattering at the interface was assumed. The scattering was modelled by a random, zero-mean normal-distributed change of the propagation direction

at the interface between the two crossing fibres with the standard deviation

, similarly to the method described in [ 35 ], where the probability density function

is defined by:

…”

Section: Methodsmentioning

confidence: 99%

Analysis of Fibre Cross-Coupling Mechanisms in Fibre-Optical Force Sensors

Bunge

Kallweit

Colakoglu

et al. 2021

Sensors

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The force-enhanced light coupling between two optical fibres is investigated for the application in a pressure or force sensor, which can be arranged into arrays and integrated into textile surfaces. The optical coupling mechanisms such as the influence of the applied force, the losses at the coupling point and the angular alignment of the two fibres are studied experimentally and numerically. The results reveal that most of the losses occur at the deformation of the pump fibre. Only a small percentage of the cross-coupled light from the pump fibre is actually captured by the probe fibre. Thus, the coupling and therefore the sensor signal can be strongly increased by a proper crossing angle between the fibres, which lead to a coupling efficiency of 3%, a sensitivity improvement of more than 20 dB compared to the orthogonal alignment of the two fibres.

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“…Since many rays would not have been guided by the probe fibre—in particular for large tilting angles

—a certain amount of scattering at the interface was assumed. The scattering was modelled by a random, zero-mean normal-distributed change of the propagation direction

at the interface between the two crossing fibres with the standard deviation

, similarly to the method described in [ 35 ], where the probability density function

is defined by:

…”

Section: Methodsmentioning

confidence: 99%

Analysis of Fibre Cross-Coupling Mechanisms in Fibre-Optical Force Sensors

Bunge

Kallweit

Colakoglu

et al. 2021

Sensors

Self Cite

View full text Add to dashboard Cite

show abstract

“…In the case of doping by scattering particles, both cladding and core doping are possible. The insertion of defects is feasible by using a femtosecond laser [33,48]. While the use of scattering particles is directly implemented in the POF manufacturing process, the treatment using the femtosecond laser is an additional and subsequent process.…”

Section: Bulk Scatteringmentioning

confidence: 99%

“…With regard to the fiber axis, microperforated or notched fibers have locally variable cross-sections. They differ from non-circular fibers, which typically have a constant cross-sectional shape over the entire length of the fiber, although certain non-circular cross-sections, such as, e.g., a trilobal shape, can be considered as circular fibers with three axially long notches that also influence the amount and direction of light emittance [48].…”

Section: Surface Perforationmentioning

confidence: 99%

An Overview on Methods for Producing Side-Emitting Polymer Optical Fibers

et al. 2021

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An overview of the most important methods for producing side-emitting polymer optical fibers is given. Based on a systematic literature and patent search, the methods that are applied in practice and explored in research are identified. The fabrication methods are classified into four groups according to the physical phenomenon that hinders total internal reflection: bulk scattering, bending, surface perforations and luminescence. Subdivisions are made regarding the actual processing steps. The production methods are described in detail and discussed with respect to their customizability and applications.

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