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Ring fibre laser with interferometer based in long period grating for sensing applications

✍ Scribed by O. Frazão; C. Correia; J.M. Baptista; M.B. Marques; J.L. Santos

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
170 KB
Volume
281
Category
Article
ISSN
0030-4018

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✦ Synopsis

This work presents two distinct configurations based on phase-wavelength conversion using a ring fibre laser with two different long period gratings interferometer topologies. The sensors are interrogated by analysing the wavelength change of the emission laser, which is directly dependent on the interferometer phase change. The first configuration integrates a Mach-Zehnder interferometer, which is based on a pair of long period gratings and is used as sensing head for bending radius and longitudinal strain measurement. The second configuration, comprehends a Michelson interferometer, which is based on a single LPG and a fibre end mirror and is used as a liquid level sensor or as an optical refractometer.

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