Fiber Bragg Grating-Based Temperature Distribution Evaluation of Multilayer Insulations Between 300 K–77 K

An optical method for the evaluation of temperature distribution of multilayer insulation (MLI) is presented. Four fiber arrays with four Fiber Bragg Grating (FBG) sensors in each array are fabricated in a wavelength division-multiplexing (WDM) scheme. MLI temperature varies the gratings periods of the FBG sensors which changes the back reflected Bragg wave… (More)