High-precision and wide-range temperature measurement and control system of satellite-borne calibration blackbody.

The accurate measurement and control of blackbody temperature can play an important role in radiometric calibration. A novel circuit suitable for the aerospace environment is designed to measure and control the temperature of the blackbody. A coarse-fine measurement method considering the wire resistance and self-heating effect of the platinum resistance is presented to calculate the resistance values of the platinum resistors. The precision of temperature measurement is improved using a line fitting algorithm with error calibration and temperature drift error compensation. A fuzzy self-adaptive PID controller is designed to improve the temperature control effect. The performances of the developed system are implemented on an FPGA/A3PE3000-FG484I controller board. The test results show that the device temperature measurement precision can reach ± 0. 03 K for the entire temperature range 238 K to 367 K , the temperature stability is better than 0.02 K /20 s , and the temperature uniformity is better than 0.1 K. • A temperature measurement and control circuit suitable for the aerospace environment is designed. • A coarse-fine measurement method considering the wire resistance and the self-heating effect of the platinum resistance is presented to calculate the resistance value. • The temperature measurement precision is improved using a line fitting algorithm with error calibration and temperature drift error compensation. • The test results show that the temperature measurement precision can reach ±0.03 K, the stability and uniformity of the temperature are better than 0.02 K/20 s and 0.1 K, respectively. [ABSTRACT FROM AUTHOR]