Development of Auto-filling System for Dewar Liquid Nitrogen Bottles

The paper mainly introduces the structure of Dewar liquid nitrogen bottles auto-filling system, the work theory and the features of related hardware, and briefly describes functions of the software. The system can separate the liquid nitrogen bottles to four groups arbitrarily, start system timely according to the requirement of experiment, and has the ability of expansion. This system can also raise the HPGe detector experiment working efficiency, and release the workload of workers.