Data Acquisition System in the LLMC

The hardware structure and the software designed for the data acquisition system based on the scientific CCD in the LLMC are described in this paper.To determine the position of a celestial body absolutely and precisely,the LLMC is equipped with several precision measurement devices such as one precision clock,nine Reticon linear photodiode arrays,one video CCD,one scientific CCD,one rotary inductive synchronizer,and one grating linear displacement transducer.To control these devices properly and collect data from these devices orderly during observations,a data acquisition and control system is developed,which is composed of three subsystems.The functions of the measurement devices in the system are illustrated,the methods of data acquisition are discussed,and our thoughts about software programming are presented in the paper.