Impact of the Fiber Coating on the Temperature Response of Distributed Optical Fiber Sensors at Cryogenic Ranges

The thermomechanical behavior of a standard single-mode fiber with different coating materials is theoretically analyzed under different temperature conditions. Results show that the thermal expansion/shrinkage of the fiber coating introduces an extra strain on the optical fiber and can modify its thermal response. Distributed fiber sensors based on coherent Rayleigh and Brillouin scatterings are employed to characterize the impact of different coatings on the temperature sensitivity. The standard coating with dual-layer demonstrates a little influence on the thermal response at room temperature due to the softness of primary coating, but it increases the temperature sensitivity by some 50% at ∼220 K as the primary coating becomes stiffer at low temperature. Optical fibers with aluminum and Ormocer coatings are also experimentally tested. All the measured results agree well with the theoretical analysis.

[1]  Marcelo A. Soto,et al.  Temperature sensitivity enhancement in a standard optical fiber with double coatings at low temperature , 2017, 2017 25th Optical Fiber Sensors Conference (OFS).

[2]  Yasuo Nakajima,et al.  A Study for Estimating Thermal Strain and Thermal Stress in Optical Fiber Coatings , 2008 .

[3]  Marcelo A. Soto,et al.  MilliKelvin resolution in cryogenic temperature distributed fibre sensing based on coherent Rayleigh scattering , 2014, Other Conferences.

[4]  Yongkang Dong,et al.  Dependence of Brillouin frequency shift on radial and axial strain in silica optical fibers. , 2012, Applied optics.

[5]  Huann-Ming Chou,et al.  Elasto-optics in double-coated optical fibers induced by axial strain and hydrostatic pressure. , 2002, Applied Optics.

[6]  S. James,et al.  Strain response of fibre Bragg grating sensors at cryogenic temperatures , 2002, 2002 15th Optical Fiber Sensors Conference Technical Digest. OFS 2002(Cat. No.02EX533).

[7]  Luc Thevenaz,et al.  Brillouin optical fiber sensor for cryogenic thermometry , 2002, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[8]  M. Froggatt,et al.  High-spatial-resolution distributed strain measurement in optical fiber with rayleigh scatter. , 1998, Applied optics.

[9]  Luc Thévenaz,et al.  Modeling and evaluating the performance of Brillouin distributed optical fiber sensors. , 2013, Optics express.

[10]  S. L. Floch,et al.  Study of Brillouin gain spectrum in standard single-mode optical fiber at low temperatures (1.4–370 K) and high hydrostatic pressures (1–250 bars) , 2003 .

[11]  J Jarzynski,et al.  Temperature-induced optical phase shifts in fibers. , 1981, Applied optics.

[12]  Gabriele Bolognini,et al.  Raman-based fibre sensors: Trends and applications , 2013 .

[13]  Federico Scurti,et al.  Effects of metallic coatings on the thermal sensitivity of optical fiber sensors at cryogenic temperatures , 2017 .

[14]  Michael A. Davis,et al.  Fiber grating sensors , 1997 .

[15]  Marcelo A. Soto,et al.  Double-pulse Brillouin distributed optical fiber sensors: analytical model and experimental validation , 2012, Other Conferences.

[16]  Eric Udd,et al.  An overview of fiber‐optic sensors , 1995 .

[17]  W. Dennis.  Optical Fiber Coatings , 1988 .

[18]  Huijuan Dong,et al.  Effects of Polymer Coatings on Temperature Sensitivity of Brillouin Frequency Shift Within Double-Coated Fibers , 2013, IEEE Sensors Journal.

[19]  W. Ecke,et al.  ORMOCER Coated Fiber-Optic Bragg Grating Sensors at Cryogenic Temperatures , 2012, IEEE Sensors Journal.

[20]  M. Tur,et al.  State of the art of Brillouin fi ber-optic distributed sensing , 2015 .

[21]  Luc Thévenaz,et al.  Temperature-strain discrimination in distributed optical fiber sensing using phase-sensitive optical time-domain reflectometry. , 2017, Optics express.

[22]  S. Mahar,et al.  Spontaneous Brillouin Scattering Quench Diagnostics for Large Superconducting Magnets , 2008 .

[23]  A. Brotzu,et al.  Improving FBG Sensor Sensitivity at Cryogenic Temperature by Metal Coating , 2008, IEEE Sensors Journal.

[24]  Hideyuki Kato,et al.  Laser interferometric dilatometer at low temperatures : application to fused silica SRM 739 , 1995 .

[25]  Douglas B. Leviton,et al.  Temperature-dependent absolute refractive index measurements of synthetic fused silica , 2006, SPIE Astronomical Telescopes + Instrumentation.

[26]  Fumio Wada,et al.  Distributed temperature sensors for single-mode fibers , 1992, Other Conferences.

[27]  Y. Koyamada,et al.  Fiber-Optic Distributed Strain and Temperature Sensing With Very High Measurand Resolution Over Long Range Using Coherent OTDR , 2009, Journal of Lightwave Technology.

[28]  Moshe Tur,et al.  Structural health monitoring of composite-based UAVs using simultaneous fiber optic interrogation by static Rayleigh-based distributed sensing and dynamic fiber Bragg grating point sensors , 2015, International Conference on Optical Fibre Sensors.