Results 11 to 20 of about 10,599,323 (287)
Nested long period grating interferometers [PDF]
SPIE Proceedings, 2007 The concept of nested fibre optic long period grating (LPG) based interferometers is introduced. A number of in-series, identical LPGs may be used to form a set of nested, multiplexed Mach-Zehnder interferometers that may demodulated and demultiplexed by virtue of a Fourier analysis of the optical spectrum.
Murphy, Richard P. +2 more
openaire +4 more sources
Optical fibre long period grating sensors with nanostructured coatings [PDF]
, 2011 The dual resonant response of long period fibre gratings (LPG) operating near the phase matching turning point to the deposition of nanostructured coatings is explored.
Topliss, Stephen M.
core +7 more sources
Composite material process monitoring using optical fibre grating sensors [PDF]
, 2008 In this thesis a long period grating (LPG) based sensor is investigated as a possible alternative to current process monitoring sensors used in the manufacture of composites to monitor cure. An LPG is demonstrated as a means of monitoring the cure of a
Buggy, Stephen J.
core +7 more sources
Two-photon long-period grating inscription in pure-fused-silica photonic crystal fiber [PDF]
, 2007 Photochemical inscription of a long-period grating in a pure fused silica photonic crystal fiber (PCF) is reported.
Brambilla, Gilberto +3 more
core +3 more sources
Helical Long Period Fiber Grating Inscribed in Elliptical Core Polarization-Maintaining Fiber
IEEE Access, 2021 A high-quality helical long period fiber grating (HLPFG) in elliptical core polarization-maintaining fiber (PMF) was experimentally demonstrated by using the hydrogen-oxygen flame heating technique.
Cailing Fu +3 more
doaj +1 more source
High Temperature Long Period Grating Thermo-Mechanically Written
Sensors, 2009 An optical fiber transducer able to work in high temperature environments is experimentally demonstrated in the laboratory. It is based on a permanent long period grating (LPG) written using a new technique based on a thermo-mechanical approach.
Antonio Quintela +2 more
doaj +1 more source
Radiation Effects on Long Period Fiber Gratings: A Review [PDF]
Sensors, 2020 Over the last years, fiber optic sensors have been increasingly applied for applications in environments with a high level of radiation as an alternative to electrical sensors, due to their: high immunity, high multiplexing and long-distance monitoring capability.
Flavio Esposito +3 more
openaire +4 more sources
A long period grating based directional flow sensor [PDF]
, 2008 A chirped long period grating (LPG) is used as a directional flow sensor by monitoring the change in the transmission spectrum upon immersion in an oil of refractive index higher than that of the fibre cladding. The change in profile of an attenuation
Stephen J. Buggy +5 more
core +1 more source
Structural microfiber long-period gratings
Optics Express, 2012 We experimentally demonstrate a novel structural long-period grating by helically coiling one microfiber onto another with the relatively thicker diameter. Owing to the strong periodic modulation of the coiled microfiber to the evanescent field of the straight microfiber, a resonance transmission notch of ~16.2 dB can be induced for a compact device ...
Li-Peng, Sun +3 more
openaire +2 more sources
Fibers, 2017 The manufacturing and spectral features of different types of long period fiber gratings (LPFGs), ranging from phase-shifted, turn-around point, and internally tilted gratings, to pseudo-random gratings, are described and discussed in detail.
Francesco Chiavaioli +2 more
doaj +1 more source