Modal LPG-based Mach-Zehnder interferometer with controlled sensitivity for refractive index measurement

• Type: Article in International Conference Proceedings Book
• Date: 2008

Authors

Caldas, P (Author) Other; Jorge, PAS (Author) FCUP; Araujo, F (Author) Other; Ferreira, LA (Author) Other; Rego, G (Author) Other; Santos, JL (Author) FCUP

Conference proceedings International

Title: 19TH INTERNATIONAL CONFERENCE ON OPTICAL FIBRE SENSORS, PTS 1 AND 2

19th International Conference on Optical Fibre Sensors

Perth, AUSTRALIA, APR 15-18, 2008

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Scientific classification

FOS: Engineering and technology > Environmental biotechnology

Other information

Authenticus ID: P-004-542

DOI: 10.1117/12.786093

Abstract (EN): 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.

Language: English

Type (Professor's evaluation): Scientific