silica has a perfect elasticity until it reaches the breaking point, which makes it best for fabrication. q3 what is the principle of fibre optical communication? total internal reflection is the principle on which the optical fibre communication is based. q4 name the factors that are responsible...
sensor working according to the Fabry-Perot principle has an open capillary piece (5) into which at least one optic fibre (1) is inserted in such a way that its inserted end surface forms with an optic reflecting surface a gap with parallel faces perpendicular to the axis of the fibre. ...
The optical fibre was first time demonstrated by Daniel Colladon and Jacques Babinet in Paris in the early 1840s. They made this by refraction of light. After 12 years, John Tyndall included a demonstration on it. In 1960, the laser light was first used as a light source. In 1965, high...
Multimodal taper-tipped fibre microprobes were then fabricated and were characterized. This advanced design could provide promising tools for in vivo electrophysiological experiments that require light delivery through an optical core in addition to neuronal activity recording. Multimaterial and multifunctional ...
This approach to sensing uses the well-known, time-tested principle of interferometry but on a small scale. In an interferometer, a single waveform (which can be optical or radio) is split into two equal parts by a beam splitter (a half-silvered mirror). One part, called the sensing beam...
Integrating optical fibers into textiles opens up a wide range of new, fascinating applications – starting from data transmission to sensory abilities, new lightening concepts, and advanced medical therapies. This chapter gives first an overview on the working principle and light transmission mechanisms...
In 2012, an all-fibre optical Fabry-Perot interferometer strain sensor whose cavity was a microscopic air bubble was demonstrated with a strain sensitivity of 4 pm/N and a low-temperature sensitivity less than 0.9 pm/°C [160]. The strain sensor has the same working principle as those ...
The large development of fibre Bragg gratings (FBGs) over decades has made this kind of structures one of the most mature optical fibre sensing technologies existing today, demonstrating key features for a very wide range of applications. FBG sensors are fragile and must be normally protected for...
A typical optical fibre consists of a core and a cladding, both made of silica. The core is often doped with germanium to increase its refractive index, thereby providing the condition for light guidance by TIR. The light that propagate in the fibre consists of guided electromagnetic field in...
A kind of optical-fibre pH sensor which has immobilized pH-sensitive indicator dye reagents on the tip of the optical fibre has been studied. The probe is made by covalently immobilizing phenol red, bromine phenol blue or bromothymol blue on the polyacrylamide microsphere fixed by polytetrafluoret...