The CCD camera-based image temperature measurement technology has its unique advantages

but it also has problems such as tedious calibration procedure and narrow measuring range for high temperatures.To solve these problems

this paper proposed an improved method called individual exposure two-color pyrometry based on the 3 CCD camera

which can set appropriate exposure time of R

G and B channels respectively.The relationship between the signal value and the exposure time of each channel of the 3 CCD camera was established

and the signal value of R

G and B channel at any exposure time can be derived.The calibration and test conducted in the blackbody furnace showed that

the available temperature range was 140% wider than before and this method had a reasonable measuring accuracy within 1 450~2 200 ℃

with relative error of no more than ±1.00%.Therefore

suitable exposure time can be chosen in practice without the calibration burden in black-body furnace repeatedly

thus the practicability of the CCD camera pyrometry was significantly improved.