关键词: ⁴⁰Ar/³⁹Ar同位素定年, 纯化系统, PLC, 自动化改造

Abstract: The automation retrofit of purification part in the conventional ⁴⁰Ar/³⁹Ar dating laboratory of Peking University was based on mastering the components and operation processe of the purification part. By clearing the requirements of the system, the authors proposed an automatic control method, using PLC (programmable automation controller) as the core of the control system in order to monitor and control the purification system. The automatic reform include the hardware control part and the software part. First, the manual valves was changed to the automatic valves. The transformation of the hardware is based on the purification system’s demands of automatic valves to allocate the I/O ports (input/output) and design the related electrical schematics. In the software part, by use of anxiliary register, program is designed to realize the interlocking of pneumatic valves and make pneumatic valves in the purification system work automatically. The newly promoted purification system made the ⁴⁰Ar/³⁹Ar dating experiment run automatically, which saved manpower, improved the utilization efficiency of the experimental apparatus, reduced the artificial errors caused by person participation, and laid foundation for further automatic improvement of the laboratory.

Key words: ⁴⁰Ar/³⁹Ar isotope dating, purification system, PLC, automation reform