Inline Cryogenic Temperature Sensors based on Photonic Crystal Fiber Bragg Gratings Infiltrated with Noble Gases for Harsh Space Applications

Summary form only given. In this paper, by infiltrating the microstructured holes of a PCF with a noble gas such as Krypton (Kr), which exhibits a drastic phase-change from gas to liquid at ultra-low temperatures as well as strong wavelength-dependent material dispersion characteristics, and by inscribing a BG of period into the PCF, we can succeed in utilizing a robust temperature sensor which can be effectively applied at ultra-low temperatures.