2024/07/09 by Shojaei Khatouni, Sohrab, Zakowski, Sven, Hosseini Vedad, Reza +4
#Electronic Engineering #MLE@TUHH #Natural Sciences and Mathematics::530: Physics #Technology::620: Engineering #Technology::621: Applied Physics::621.3: Electrical Engineering
paper · doi:10.15480/882.13129
This paper presents the development and evaluation of four sensors based on multiple fiber Bragg grating (FBG) constellations embedded in a silicon dioxide single-mode fiber (SMF) for simultaneous measurement of pressure, temperature, and bending curvature. We applied dimension and material variations – including core, cladding, and coating dimensions; coating material; and the number and arrangement of the FBGs – to optimize the reflected signal response and increase information density. A bootstrap-aggregated ensemble of decision trees was used to evaluate the sensor signal. The results show that adjusting the cladding-to-coating ratio led to significant improvements in pressure and bending prediction performance. Additionally, two combined FBGs were fabricated to form a fiber Bragg grating Fabry–Pérot interferometer, which enabled the detection of curvature with a root-mean-square error (RMSE) of 0.0034 L mm -1( R2=1), axial pressure with an RMSE of 0.0564 bar ( R2=0.99), and temperature with an RMSE of 0.0265 °C ( R2=1). At the time of writing, there is no commercially available instrument that can perform these measurements simultaneously.