Air pressure sensor using fiber bragg gratings (FBG as air pressure sensors on generic UTM-LST half model)

Abstract

This work was performed to investigate the feasibility of using Fiber Bragg Gratings (FBGs) strain sensor in detection of air pressure on aeroplane model known as Generic UTM Half-Model. The FBGs was attached on the surface of the aeroplane model where its position is as near as possible to the location of static conventional pressure sensor. Then, the sensing performance was tested inside UTM Low Speed Tunnel (UTM-LST) with the wind speed set at 30 ms^(-1), 40. ms.^(-1), and 50 ms^(-1). The direction of wind was arranged to be in perpendicular to the FBG and the position of wing model was varied at angle of 0°, 5°, 10°, 15°, and 20°. The measured pressure coefficient, Cp based on Bragg wavelength shift was compared with Static FKPS 30DP Pressure Measuring Module data. The results reveal that the shift in Bragg wavelength was found to increase linearly from angle 0° until 10° and after that the wavelength shift become saturated. The pressure coefficient obtained by FBGs has well agreed with the value obtained by pressure coefficient of pressure sensor module at low angle of attack from 0° to 10°.