Space Solar Telescope is one of the large-scale scientific programs under development in China. In it, an important part
is the filter, a birefringent filter with three-channels. It consists of 17 rotatable wave plates. In coordination with other
mechanical and optical components, complicated and precise adjustments of their attitudes are necessary, which requests
a high-accuracy control system to ensure their concertedness.
The paper describes the design and realization of the control system. It mainly has a hardware plate and a software one.
The former uses an industrial controller, a control card and step motors, while the latter uses the technique construction
of the object oriented. That is modularization design with lengthwise dividing as per functions and breadthwise dividing
as per element layers. Shift arithmetic for whole spectrum in programs is for intelligent spectral scanning. At the same
time, the control information is roundly recorded in the data base of the system.
Tests show that the system is characterized by high precision, good stabilization, high data safety and user-friendly
interface, totally meeting the design requirements.
Also discussed in this paper is some new conceivability to realize the handiness and miniaturization of the filter to fit the
use in space flight in the future.