Embedded fibre Bragg grating sensors in advanced composite materials

Abstract Fibre Bragg grating (FBG) sensors have been embedded in a number of advanced composite materials and fibre/metal laminates (FMLs). The post-fabrication FBG spectra were studied to examine the influence of manufacturing variables (such as composite stacking sequence and resin flow during processing) on the final profile of the spectrum and the functionality of the FBG sensor. Distortion and broadening of the width of the FBG spectra were observed in several of the specimens. As a result of a strong non-uniformity of the strain field caused by local asymmetric loading of the sensor, pronounced splitting of the spectra into multiple peaks was noted for FBG sensors embedded in angle-ply configurations. In contrast, the FBG spectra for the unidirectional specimens exhibited a single well-defined peak. Tensile tests carried out on these specimens showed excellent linearity within the test regime. However, for specimens exhibiting a multi-peak spectrum, it was observed that these specimens showed a tendency to produce strain anomalies during the loading event.

[1]  Nobuo Takeda,et al.  Detection of transverse cracks in CFRP composites using embedded fiber Bragg grating sensors , 2000 .

[2]  Rosly Abdul Rahman,et al.  Fibre optic Bragg grating sensors , 2000 .

[3]  Wesley J. Cantwell,et al.  The mechanical properties of fibre-metal laminates based on glass fibre reinforced polypropylene , 2000 .

[4]  Yu-Lung Lo,et al.  Measurement of Corrosion and Temperature Using a Single-Pitch Bragg Grating Fiber Sensor , 1998 .

[5]  W. Cantwell,et al.  Fracture of glass/polypropylene laminates: influence of cooling rate after moulding , 1994 .

[6]  Raymond M. Measures,et al.  Strain sensing using a fiber-optic Bragg grating , 1991, Other Conferences.

[7]  Rene-Paul Salathe,et al.  Measurement of stress concentrations using embedded optical fiber Bragg grating sensors , 1999, Smart Structures.

[8]  M. Dupont,et al.  Embedded Fiber Bragg Grating Sensors for Industrial Composite Cure Monitoring , 1998 .

[9]  Gerald Meltz,et al.  Fiber Optic Bragg Grating Sensors , 1990, Other Conferences.

[10]  Lin Zhang,et al.  Uv-written in-fibre Bragg gratings , 1996 .

[11]  Henrik D. Simonsen.  Fiber Bragg grating sensor demonstration in glass-fiber reinforced polyester composite , 1992, Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[12]  J. Alfredo Guemes,et al.  Measurement of strain distribution in bonded joints by fiber Bragg gratings , 1998, Smart Structures.

[13]  R. Dändliker,et al.  Determination of the individual strain-optic coefficients in single-mode optical fibres , 1988 .

[14]  James S. Sirkis,et al.  Simultaneous measurement of temperature and strain using a single Bragg grating , 1999, Smart Structures.

[15]  M. Leblanc,et al.  Continuous arbitrary strain profile measurements with fiber Bragg gratings , 1998 .

[16]  J. Bokor,et al.  Bragg gratings fabricated in monomode photosensitive optical fiber by UV exposure through a phase mask , 1993 .

[17]  Maurice Whelan,et al.  Residual strain measurement and impact response of optical fibre Bragg grating sensors in fibre metal laminates , 2001 .

[18]  G. Meltz,et al.  Formation of Bragg gratings in optical fibers by a transverse holographic method. , 1989, Optics letters.

[19]  Hwa-Yaw Tam,et al.  Fundamentals and applications of optical fiber Bragg grating sensors to textile structural composites , 1998 .

[20]  Harald Geiger,et al.  Finite element stress and strain analysis in composites with embedded optical fiber sensors , 1995 .

[21]  A. Kersey,et al.  Fiber-optic Bragg-grating differential-temperature sensor , 1992, IEEE Photonics Technology Letters.

[22]  K. Hill,et al.  Fiber Bragg grating technology fundamentals and overview , 1997 .