Fiber modal Michelson interferometers with coherence addressing and heterodyne interrogation

• Type: Article in International Scientific Journal
• Date: 2008

Authors

Paulo Caldas (Author) Other; Pedro A S Jorge (Author) FCUP; Araujo, FM (Author) Other; Luis A Ferreira (Author) Other; Manuel B Marques (Author) FCUP; Gaspar Rego (Author) Other; Jose Luis Santos (Author) FCUP

Journal

Title: Optical Engineering

Vol. 47

Final page: 044401

ISSN: 0091-3286

Publisher: SPIE

Indexing

ISI Web of Knowledge - 15 Citations

Scopus - 21 Citations

Scientific classification

FOS: Natural sciences > Physical sciences

Other information

Authenticus ID: P-004-0P3

DOI: 10.1117/1.2903089

Abstract (EN): A long-period-grating-based fiber optic Michelson modal interferometer with coherence addressing and heterodyne interrogation is studied as a sensing structure for measuring environmental refractive index, temperature, and liquid level. The effects of several system parameters on the measurements are investigated. Experimental results show that the sensitivity to the external refractive index increases with the order of cladding mode and with a reduction of the fiber diameter. The decrease of the fiber diameter from 125 mu m down to 70 mu m enhances the sensitivity to the external index by a factor of 2.7. It is also shown that the use of a silica-core fiber increases the sensitivity to the external index by a factor of 1.4 and reduces the thermal sensitivity by a factor of 2.5 compared to a standard fiber. (C) 2008 Society of Photo-Optical Instrumentation Engineers.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7