Highly sensitive static strain fiber-Bragg grating sensor using an interrogating laser locked to stable atomic lines

B. Lissak, A. Arie, M. Tur

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Due to their fiber-based, highly localized and wavelength cncoded operation, fiber Bragg gratings (FBG) offer attractive sensing possibilities, especially in strain and temperature embedded sensing of smart structures. In this paper we present a novel, passive interrogation method for FBG static strain measurements, capable of very high sensitivity and high resolution. The obtained sensitivity is comparable to the best results obtained using other interrogation techniques. In order to detect the static strain-induced wavelength shift in the reflection signal of an FBG, a stable wavelength reference should be used. Possible frequency references include another isolated FBG [1], an interferometric reference - e.g. a Fabry-Pcrot cavity, or an atomic or molecular transition. The highest long-Term stability and accuracy is achieved by locking to atomic/molecular references. These absorption lines arc very stable with respect to the operating conditions. For example, semiconductor lasers locked to Rubidium (Rb) Doppler-broadencd lines have negligible temperature-induced frequency shift ( lMHz/°C) and very small intensity induced shift (-5 MHz/(mW/cm2) [2J. For comparison, the center reflection frequency of an FBG has a temperature-induced frequency shift of -1.2 GHz/'C. Even a thermally-compensated FBG has a much larger shift than that of atomic or molecular lines.

Original languageEnglish
Title of host publicationOFC/IOOC 1999 - Optical Fiber Communication Conference and the International Conference on Integrated Optics and Optical Fiber Communication
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages226-228
Number of pages3
ISBN (Electronic)155752582X, 9781557525826
DOIs
StatePublished - 1999
Event1999 Optical Fiber Communication Conference and the International Conference on Integrated Optics and Optical Fiber Communication, OFC/IOOC 1999 - San Diego, United States
Duration: 21 Feb 199926 Feb 1999

Publication series

NameOFC/IOOC 1999 - Optical Fiber Communication Conference and the International Conference on Integrated Optics and Optical Fiber Communication
Volume2

Conference

Conference1999 Optical Fiber Communication Conference and the International Conference on Integrated Optics and Optical Fiber Communication, OFC/IOOC 1999
Country/TerritoryUnited States
CitySan Diego
Period21/02/9926/02/99

Fingerprint

Dive into the research topics of 'Highly sensitive static strain fiber-Bragg grating sensor using an interrogating laser locked to stable atomic lines'. Together they form a unique fingerprint.

Cite this