A ground⁃based infrared radiation characteristic measurement system not only undertakes the measurement of radiation characteristic, but also realizes the imaging in outfield. However, as for the manufacturing defects of the infrared focal the existing plane and the thermal radiation of system, it leads to the phenomenon of non⁃uniformity. Considering that the limitations of traditional non⁃uniformity correction algorithms, a variable integration time non⁃uniformity correction algorithm based on calibration was proposed in this paper. To confirm the effect of the proposed algorithm，the verification experiment based on 600 mm aperture mid⁃infrared radiation measurement system. The experimental results show that the original image non⁃uniformity under 2.5 ms and 3.0 ms is reduced from 3.69% to 0.22%. It is confirmed that the proposed algorithm has good correction effect and has engineering application significance.

Perovskitetype oxide Ba0.6Sr0.4Co0.9Nb0.1O3δ (BSCN) was synthesized by the solid state reaction and investigated as a cathode for intermediatetemperature solidoxide fuel cells (ITSOFCs). XRD pattern indicated that BSCN crystallized in a singlephase perovskite with a cubic perovskite structure (Pm3m) and no evident reaction happened after the mixture of BSCN cathode and GDC electrolyte was sintered at 1 000 ℃ for 10 h. During the operating temperature of SOFCs (600~800 ℃), the electrical conductivity of BSCN reaches 21~27 S/cm. The thermal expansion coefficient value of 17.0 × 10-6/K has been measured for BSCN sample, which is much lower than that of SrCo0.9Nb0.1O3δ(SCN). This result indicated that Ba doping in SCN has a better thermal match to GDC electrolyte. Symmetrical cell with the configuration of BSCN/GDC/BSCN was used for the impedance measurements. The polarization resistance of BSCN cathode on GDC electrolyte is 0.026 Ω·cm2 at 750 ℃. With BSCN cathode, NiOCe0.8Sm0.2O1.9 anode and 300 μm thick GDC electrolyte, the maximum power density of single cell achieved 782 mW/cm2 at 800 ℃. All these results indicate that the BSCN oxide is a promising cathode candidate material for ITSOFCs.