Optical bend sensor for vector curvature measurement based on Bragg grating in eccentric core polymer optical fibre

Abstract

We present an optical bend sensor based on a Bragg grating written in an eccentric core polymer optical fibre. The grating wavelength shifts are studied as a function of bend curvature and fibre orientation and the device exhibits strong fibre orientation dependence, wide bend curvature range of ± 22.7 m -1 and high bend sensitivity of 63 pm/m -1 , which is 80 times higher than the reported sensor based on an offset-FBG in standard single mode silica fibre.

Multiplexed LPG sensor system using an InGaAs CCD linear array and optical switches

“…4-11. Although the same scheme can be used with FBGs, the use of LPGs instead of FBGs provides a far better sensitivity. Comparison with the results for FBG-based bending sensors [19] reveals that with LPGs, the wavelength shifts are about five times higher for considerably lower curvatures than with FBGs.…”

Bend Sensor Using Fiber Bragg Gratings to Determinate the Distance from the Sensor to the Neutral Axis in Compression and Extension

“…La fig. 7 muestra la salida de los tres sensores para una fibra, la cual refleja la condición de compresión a medida que el radio de curvatura aumenta, como era de esperarse [19]. La única diferencia se encuentra a lo largo del eje de ordenadas, ya que se desea evitar el solape entre estas tres señales.…”

Drug-Induced T-Wave Morphology Changesn

“…resolution requirements. Bend sensors in polymer optical fibres based on FBGs have been demonstrated by Chen et al [46,47]. However, polymer optical fibres are more fragile and sensitive to mechanical exhaustion than typical silica optical fibres, and therefore they are not preferred for applications in wind turbines.…”