Sapphire fiber sensor is a novel temperature sensor

plating precious metals such as platinum and iridium or ceramic film at the end of the fiber

which is based on the radiation principle of blackbody.In order to solve nonlinear errors in measurement

the principle of the blackbody radiation temperature sensor of optical fiber and nonlinear error source are analyzed.The modified method is given

and temperature calibration is carried out with standard infrared radiation temperature.Calibrated results of measurement can meet the demands of actual measurement.