The measurement method of color temperature by Si color sensor with double PN junction is first presented in this article.Based on right measurement circuit

the color temperature of a shiner is in definite relationship with the proportion of deep and shallow junction current of a color sensor correspondingly

good linearity is shown after being processed by the computer.Through the fitting and calculation of short-circuit current ratio to wavelength characteristic

the maximum measurable range of color sensor can reach 10

4

K

and the measurement precision can be 10 K.Compared to the tradition ones

it enjoys the merits of little workload and cheap cost

and is proven to be generalized and effective.