Aiming at the problems of the temperature measurement of birefringent filter during astronomy and meteorology

hardware and software structure of filter bridge type temperature measurement system is designed and least square method is adopted to fit calibration system

based on interconnected STM32 processor and three-wire type Pt1000 platinum thermal resistance. The experimental results show that the system can real time monitor temperature of center area of filter

and measurement error is ± 0. 005 ℃ near 42 ℃

measurement precision of apparent velocity in solar active region is guaranteed.