High-precision thermal strain measurements using surface-mounted fiber Bragg grating sensors

Uwe C. Mueller, Jan Both, Johannes Roths, Horst Baier

Publikation: Beitrag in Buch/Bericht/KonferenzbandKonferenzbeitragBegutachtung

6 Zitate (Scopus)

Abstract

Thermal strain measurements by fiber Bragg grating (FBG) sensors mounted onto different host materials are demonstrated for low coefficients of thermal expansion (CTE). Such low CTEs are typically found in carbon fiber reinforced plastics (CFRP). This work has application potential for FBG sensor networks in the highprecision control of thermal deformations in structures or in curing monitoring. For this purpose, a thermal error model of the FBG sensor, which accounts for the thermo-optic coefficient and the thermal expansion of the FBG, was characterized experimentally. The error-model characterization method is based on reference measurements of FBGs bonded to ZERODUR ceramics. Using this error model, thermal strain can be measured by surface-mounted FBGs on any given host structure using an external temperature reference and the FBG's wavelength shift. This method is demonstrated successfully for unidirectional layers of CFRP with a CTE of -0.4 A.10-6 1/K in fiber direction and for steel (316 Ti), which is commonly used in cryogenic applications. Measurements are performed for temperatures from 100K to 320K and the results are verified by high-precision dilatometer measurements. Accuracy limits of the FBG-based thermal strain measurements are discussed, as well as the minimization of errors induced by the FBG's structural interface. Further, the reduction of errors in the adhesive bonding is discussed. This work expands the understanding of the separation of thermal and mechanical effects in the signals obtained by FBGs.

OriginalspracheEnglisch
TitelSmart Sensor Phenomena, Technology, Networks, and Systems 2010
Herausgeber (Verlag)SPIE
ISBN (Print)9780819480637
DOIs
PublikationsstatusVeröffentlicht - 2010
VeranstaltungSmart Sensor Phenomena, Technology, Networks, and Systems 2010 - San Diego, CA, USA/Vereinigte Staaten
Dauer: 8 März 201010 März 2010

Publikationsreihe

NameProceedings of SPIE - The International Society for Optical Engineering
Band7648
ISSN (Print)0277-786X

Konferenz

KonferenzSmart Sensor Phenomena, Technology, Networks, and Systems 2010
Land/GebietUSA/Vereinigte Staaten
OrtSan Diego, CA
Zeitraum8/03/1010/03/10

Fingerprint

Untersuchen Sie die Forschungsthemen von „High-precision thermal strain measurements using surface-mounted fiber Bragg grating sensors“. Zusammen bilden sie einen einzigartigen Fingerprint.

Dieses zitieren