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Proceedings Paper

Modal LPG-based Mach-Zehnder interferometer with controlled sensitivity for refractive index measurement
Author(s): P. Caldas; P. A. S. Jorge; F. Araújo; L. A. Ferreira; G. Rego; J. L. Santos
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Paper Abstract

In this work, an LPG-based Mach-Zehnder interferometer was evaluated as a sensing structure for environmental refractive index measurement. To interrogate this sensing device, coherence addressing and pseudo-heterodyne processing were used. The impact of stretching, bending and twisting the interferometer on the sensitivity to refractive index changes r was studied. It is shown that, due to the antisymmetric nature of cladding modes in arc-induced LPGs, it is possible to tune the system sensitivity by simple mechanical action.

Paper Details

Date Published: 16 May 2008
PDF: 4 pages
Proc. SPIE 7004, 19th International Conference on Optical Fibre Sensors, 700448 (16 May 2008); doi: 10.1117/12.786093
Show Author Affiliations
P. Caldas, INESC Porto (Portugal)
Univ. do Porto (Portugal)
Escola Superior de Tecnologia e Gestão de Viana do Castelo (Portugal)
P. A. S. Jorge, INESC Porto (Portugal)
F. Araújo, INESC Porto (Portugal)
L. A. Ferreira, INESC Porto (Portugal)
G. Rego, INESC Porto (Portugal)
Escola Superior de Tecnologia e Gestão de Viana do Castelo (Portugal)
J. L. Santos, INESC Porto (Portugal)
Univ. do Porto (Portugal)


Published in SPIE Proceedings Vol. 7004:
19th International Conference on Optical Fibre Sensors

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