Power modulated temperature sensor with inscribed fibre Bragg gratings

Abstract

The Fibre Bragg Grating (FBG) based temperature optical sensor has been designed and demonstrated. FBGs have been modelled and fabricated so as to convert the Bragg wavelength shift into the intensity domain. The main experimental setup consists of a filtering FBG and two scanning FBGs, respectively, left and right scanning FBG, whereby scanning FBGs are symmetrically located on the slopes of the filtering FBG. Such an approach allows for the modulation of power for the propagating optical signal depending on the ambient temperature at the scanning FBG location. A positive or negative change of power is determined by the spectral response of the FBG. Experimental research of the scanning FBGs’ sensitivities emphasized that the key issue is the filtering FBG. A different level of sensitivity could be achieved due to the spectral characteristic of the filtering FBG. Omitting advanced and high-cost devices, the FBG-based temperature sensor is presented. The FBG-based sensor setup could yield resolution of 1°C for the range of temperature 0.5°C to 52.5°C. The experimental study has been performed as a base for an easy-placed sensor system to monitor external parameters in real environment.

Kalman filter for dynamic and static measurement of fiber Bragg grating

“…4 FBG is also widely used in power system due to its strong anti-electromagnetic interference and insulation ability. 5,6 The sensing technology based on FBG is a promising signal measurement method. The FBG sensor recovers the external signal by tracking the displacement of the center wavelength of FBG (e.g., Bragg wavelength).…”

“…In the field of aerospace, light Bragg grating is embedded in aerospace fiber materials to complete real-time monitoring of mechanical structure and thermal load curve 4 . FBG is also widely used in power system due to its strong anti-electromagnetic interference and insulation ability 5 , 6 …”

Optical strain sensor with dual fibre Bragg grating topology

“…Sensor systems using FBGs presented in the literature allow one to measure various parameters, including temperature, humidity, vibration, or strain (Kersey et al 1997;Grattan and Sun 2000;Wild and Richardson 2015;Mądry et al 2016;Bereś-Pawlik and Mądry 2018). Usually, such a measurement uses a single sensor (Wild and Richardson 2015;Mądry et al 2016) and interrogator systems. These interrogators measure the shift of the transmission or reflection spectrum of a FBG under the influence of external factors.…”