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The work presented in this paper compares the temperature sensitivity between bare fiber Bragg grating (FBG) and acrylate buffered FBG. Both FBGs were subjected to temperature variation and their wavelength shifts were recorded. It has been found that buffered FBG is more sensitive than bare FBG due to the higher thermal expansion of the acrylate buffer. The wavelength shift of the FBG increased linearly...
In this paper, we report the investigation of monitoring the degradation of transformer oil in power transformer using fiber Bragg grating sensor (FBG). The findings show that aging transformer oil has a higher refractive index (RI) compared to fresh transformer oil. This is detected by a wavelength shift in the FBG sensor's spectral response. The outcome complies with the breakdown voltage test which...
We present the effect of epoxy bonding on strain sensitivity of fiber grating sensors. We show experimentally that, on average, sensors mounted onto aluminum plates by epoxy gluing both ends of the Bragg grating (epoxy free grating zone) display 16% more sensitivity to applied strain compared to those with epoxy covering the length of the grating zone (conventional method). We also show that in the...
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