Optical measurement of mechanical parameters is gaining significant commercial interest in
different industry sectors. Torsion, twist and rotation are among the very frequently measured …

Long period fiber gratings produced by the electric arc technique have found an increasing
interest by the scientific community due to their ease to fabricate, virtually enabling the …

We demonstrate the fabrication of the helical long-period grating (HLPG) in a two-mode fiber
(TMF) with CO 2 laser. The torsion characteristics of the helical gratings are experimentally …

This paper presents an investigation of the sensing properties of long-period gratings
(LPGs) written with the electric-arc technique in commonly used standard germanium-doped …

We experimentally demonstrate a fiber ring laser for high-resolution torsion measurement,
where the laser cavity consists of a Mach-Zehnder interferometer formed with a pair of long …

We demonstrate the fabrication of helical long-period gratings (HLPGs) with the periodic
helical index modulation by twisting the double-clad fiber (DCF) while the fiber was exposed …

In this work, we review the most important achievements of INESC TEC related to the
properties and applications of arc-induced long-period fiber gratings. The polarization …

In this article, a high sensitivity, low temperature-crosstalk strain sensor based on a
microsphere embedded Fabry–Perot interferometer (FPI) is reported and experimentally …

A review of refractive index measurement based on different types of optical fiber sensor
configurations and techniques is presented. It addresses the main developments in the area …

Планарные слоистые структуры, в которых используются анизотропные материалы
различной природы (диэлектрики, полупроводники, проводники, магнетики, жидкие …