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FBGs temperature sensor for electrosurgical knife subject to high voltage and high-frequency current
In this experiments, two MS-FBG sensors were placed in a hydrogen test chamber: one with its fiber end sealed for pressure sensing and the other with its fiber end kept open for referencing purposes. It could be demonstrated that both sensors show a similar wavelength shift after some time and that due to the hydrogen diffusion, the pressure in the airholes of the sealed MS-FBG sensor equalizes the hydrogen pressure in the chamber. Furthermore, it could be demonstrated that the refractive index seen by the waveguide of the fiber is also affected. Based on all these observations, the influence of the hydrogen on the temperature and pressure measurement performance of the MS-FBG sensor is estimated, and a mitigation scheme that partially compensates for this influence is discussed.
Demodulation technique for plasmonic fiber grating sensors using orthogonally polarized light states
Differential strain sensitivity of higher order cladding modes in weakly tilted fiber Bragg gratings
Superimposed Bragg gratings written into polarization maintaining fiber for monitoring micro-strains
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