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.
A high-precision real-time tracking method for solar telescopes was introduced in this paper based on the barycenter of full-disk solar images algorithm. To make sure the calculation was accurate and reliable, a series of strictly logic limits were set, such as setting gray threshold, judging the displacement of the barycenter and measuring the deviation from a perfect disk. A closed-loop control system was designed in the method. We located the barycenter of the full-disk images which recorded by large array CCD image sensor in real time and eliminate noise caused by bad weather, such as clouds and fog. The displacement of the barycenter was analyzed and transferred into control signal drove the motor to adjust the axis of telescope. An Ethernet interface was also provided for remote control. In the observation, the precision of this new method was better than 1″/30 minutes.
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