Design of Period Measurement Instrument for Fast Neutron Criticality Facility Based on Virtual Instrument Technology

Based on the data acquisition curve fitting methold,the period measurement instrument for fast critical assembly has been designed with virtual instrument technology.The configuration and design of the instrument is introduced in this paper.Prelimilary experiment results prove that the period measurement instrument has improved the uncertainty,interference immunity,precision and consistency compared with the traditional window-mode period measurement instrument,and can satisfy the expected reqirements.