http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Miniature-Turbine Blade Embedded Fiber Bragg Grating Sensors for High Temperature Measurements
Seon Il Kim(김선일),Ho Yun Jung(정호윤),Seungweon Yang(양승원),Jongcheon Yoon(윤종천),Hyub Lee(이협),WonHyoung Ryu(류원형) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Continuous monitoring systems have played an essential role to prevent unexpected catastrophic events in industrial applications such as turbine blades which are exposed to extreme environments with high temperature and high pressure. So far, there have been extensive investigations of the various types of embedded sensors for monitoring of thermal or mechanical fatigues of turbine blades. When metal 3D printing is used to build such sensor-integrated systems, it is important that the sensor has to endure high temperature during the embedding process. In this study, we designed and fabricated a miniature-turbine blade embedded with a fiber bragg grating (FBG) sensor for high temperature monitoring. A turbine blade with total dimension of 25 mm x 60 mm x 14 mm (length, height, and width, respectively) was fabricated using directed energy deposition (DED) with Inconel 718 powder. To protect an FBG sensor during high temperature DED process, a 500 μm of Ni layer was electroplated on the FBG sensor. The reflective wavelength from a FBG sensor embedded in the turbine blade model was measured using an optical interrogator in tube furnace with temperature changes upto 500 ℃. The measured FBG wavelength was calibrated with a resistance thermometer which was placed on the vicinity of FBGs and showed negligible deviations from the thermometer values. The sensitivities of the FBG sensor were 27.7 pm/K and 29.3 pm/K for heating and cooling, respectively.