An optical-fiber bending sensor using two-mode fibers with an off-center core

Lisbôa, O.; Jen, C. K.

doi:10.1088/0964-1726/3/2/012

Cited by 7 publications

(3 citation statements)

References 7 publications

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“…Fiber optical sensors calculate the strain from the change in wavelength or phase of light . Many fiber optical strain sensors have been demonstrated to work effectively, including microbending sensors [34], twisted sensors [35], etched sensors [36], Bragg grating sensors [37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54], homodyne interferometric sensors [55,56], heterodyne interferometric sensors [57][58][59], white-light sensors [60][61][62], frequencymodulated continuous-wave interferometric sensors [63,64], and sensors based on the stimulated Brillouin scattering process [65][66][67].…”

Section: Introductionmentioning

confidence: 99%

Novel distributed strain sensing in polymeric materials

Abot

Schulz

Song

et al. 2010

Smart Mater. Struct.

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Monitoring the state of strain throughout an entire structure is essential to determine its state of stress, detect potential residual stresses after fabrication, and also to help to establish its integrity. Several sensing technologies are presently available to determine the strain in the surface or inside a structure. Large sensor dimensions, complex signal conditioning equipment, and difficulty in achieving a widely distributed system have however hindered their development into robust structural health monitoring techniques. Recently, carbon nanotube forests were spun into a microscale thread that is electrically conductive, tough, and easily tailorable. The thread was integrated into polymeric materials and used for the first time as a piezoresistive sensor to monitor strain and also to detect damage in the material. It is revealed that the created self-sensing polymeric materials are sensitive to normal strains above 0.07% and that the sensor thread exhibits a perfectly linear delta resistance-strain response above 0.3%. The longitudinal gauge factors were determined to be in the 2-5 range. This low cost and simple built-in sensor thread may provide a new integrated and distributed sensor technology that enables robust real-time health monitoring of structures.

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Section: Introductionmentioning

confidence: 99%

Novel distributed strain sensing in polymeric materials

Abot

Schulz

Song

et al. 2010

Smart Mater. Struct.

View full text Add to dashboard Cite

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“…It is based on the frequency-shift interaction between two modes in a two-mode fiber with an off-center core. For this case, the fiber is bent; a tension or compression field appears due to the asymmetry induced by the off-center core [6]. An improved version of a two-mode fiber optic curvature sensor includes temperature and strain compensation [7].…”

Section: Introductionmentioning

confidence: 99%

Curvature sensor using a highly birefringent photonic crystal fiber with two asymmetric hole regions in a Sagnac interferometer

et al. 2008

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A curvature sensor based on a highly birefringent (Hi-Bi) photonic crystal fiber inserted into a Sagnac interferometer is demonstrated. For this purpose, a novel Hi-Bi photonic crystal fiber was designed and fabricated. Half of the microstructured region of the photonic crystal fiber was composed by large diameter holes, while the other half contained small diameter holes. Because of this geometry, the fiber core was shifted from the center and high birefringence appears in the optical fiber. Curvature was applied for three different fiber directions for a range of 0.6-5 m(-1). Temperature and longitudinal strain was also characterized for constant curvature. The configuration showed insensitivity to these two physical parameters.

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“…Lisbôa et al [6] proposed an optical curvature sensor based on the interaction between the frequency-shifted of two modes in a two-mode fibre with an offcentre core. For this case, the fibre is bent; a tension or compression field appears by the asymmetry induced by the offcentre core.…”

Section: Introductionmentioning

confidence: 99%

Curvature sensor based on a fibre loop mirror using a highly birefringent photonic crystal fibre with two asymmetric hole regions

et al. 2008

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In this work, a curvature sensor based on a highly birefringent (Hi-Bi) photonic crystal fibre loop mirror is presented. For this purpose, a novel Hi-Bi photonic crystal fibre was designed and fabricated. Half of the microstructured region of the photonic crystal fibre was composed by holes with large diameter, while the other half contained holes with small diameter. Due to this geometry, the fibre core was shifted from the centre and high birefringence appears in the optical fibre. The Hi-Bi photonic crystal fibre loop mirror was demonstrated as a curvature sensor. The curvature was applied for three different fibre directions for the range of 0.6 -5 metres -1 . The configuration was also characterized for temperature and longitudinal strain, showing insensitivity for these two physical parameters.

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An optical-fiber bending sensor using two-mode fibers with an off-center core

Cited by 7 publications

References 7 publications

Novel distributed strain sensing in polymeric materials

Novel distributed strain sensing in polymeric materials

Curvature sensor using a highly birefringent photonic crystal fiber with two asymmetric hole regions in a Sagnac interferometer

Curvature sensor based on a fibre loop mirror using a highly birefringent photonic crystal fibre with two asymmetric hole regions

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