To ensure the performance of the optical components in birefringent filter, high precision constant temperature condition
is necessary. We research and realize a new thermostat for it. Firstly, we compare and select the high precision
temperature sensors and designed the complicated signal acquisition circuits; Secondly, we design and assemble the high
efficiency thermal insulation layers and a secondary thermostat; Thirdly, we use an ARM 7 processor as the central
processing unit and realize the intelligent heat algorithm. Two sets of this new generation thermostat had been put into
use since 2012, the temperature variation resolution of this new thermostat is better than 0.001°C and the temperature
stability of the birefringent filter is within 0.01°C.
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