Refractive index sensing using a multimode interference-based fiber sensor in a cavity ring-down system

• Type: Article in International Conference Proceedings Book
• Date: 2017

Authors

Susana Silva (Author) FCUP; Frazao, O (Author) FCUP

Conference proceedings International

Title: 2017 25TH INTERNATIONAL CONFERENCE ON OPTICAL FIBER SENSORS (OFS)

25th International Conference on Optical Fibre Sensors (OFS)

SOUTH KOREA, APR 24-28, 2017

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ISI Web of Knowledge - 0 Citations

Scopus - 2 Citations

Other information

Authenticus ID: P-00M-SZK

DOI: 10.1117/12.2263437

Abstract (EN): This work presents a multimode interference-based fiber sensor in a cavity ring-down system for sensing temperature-induced refractive index (RI) changes of water. The sensing head is based in multimodal interference (MMI) and it was placed inside the fiber loop cavity of the CRD system. A modulated laser source was used to send pulses down into the fiber loop cavity and an erbium-doped fiber amplifier (EDFA) was placed in the fiber ring to provide an observable signal with a reasonable decay time. The behavior of the sensing head to temperature was studied due to its intrinsic sensitivity to said parameter - a sensitivity of -1.6 10(-9) s/C was attained. This allowed eliminating the temperature component from RI measurement of water and a linear sensitivity of 580 mu s/RIU in the RI range of 1.324-1.331 was obtained.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 4