Temperature Compensated Refractometer Based on a Cascaded SMS/LPFG Fiber Structure

Abstract

A hybrid optical fiber structure for refractive index (RI) measurement with the temperature compensation capability is reported. The structure consists of a CO2 laser-induced long period fiber grating (LPFG) and a section of single mode-multimode-single mode (SMS) fiber structure. The LPFG serves as a refractometer with a temperature compensator using a simple SMS fiber structure. The sensing mechanism of this device has been investigated and experimentally demonstrated. The SMS structure was insensitive towards the change in the ambient RI but was sensitive towards the changes in the ambient temperature whereas the LPFG was sensitive towards both. A sensitivity matrix was built to compensate the temperature-RI crosstalk. The capability of simultaneous measurement of temperature and RI of the sensor was experimentally validated.

Department(s)

Electrical and Computer Engineering

Sponsor(s)

National Energy Technology Laboratory (U.S.)

Comments

This research work was supported by Department of Energy (DOE)-National Energy Technology Laboratory (NETL) under the contract DE-FE0001127.

Keywords and Phrases

Carbon dioxide; Fiber optic sensors; Fibers; Refractive index; Refractometers, Long period fiber grating; Mode structure; Optical fiber structures; Refractive index measurement; Simultaneous measurement; Temperature compensated; Temperature compensation; Temperature compensators, Multimode fibers; Single mode-multimode-single mode structure; Temperature compensated refractometer

International Standard Serial Number (ISSN)

0925-4005

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2014 Elsevier, All rights reserved.

Publication Date

01 Jul 2014

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