Data Acquisition And Implementation In Gamma Ray Detection System Based On FPGA

Nuclear power as a kind of new energy can benefit and service mankind, in the nuclear industry research, production, processing, and transportation have close relations with rays, the gamma ray is one of the main beam.In the management, transportation, storage, use, retirement of radioactive sources, and in terms of public security and risk prevention, all need to real-time detection and search rapidly were carried out on the radioactive source. Meanwhile, in order to protect the health of workers, reduce exposure. In view of the above requirements, research and design a gamma ray detection imaging system. Gamma ray detection imaging system consists of front-end probe, data acquisition and processing, image reconstruction software, etc.This paper introduces data acquisition system of the gamma ray detection system. Firstly introduces the detection principle of gamma rays, the detection means, through to the working principle of the front end and the output signal’s characteristic analysis from the detector, combined with the functional requirements and performance requirements of the research project, puts forward the overall design scheme of data acquisition system. Then the paper mainly introduce in detail the design of data acquisition system from the hardware design, software design, performance test and so on three aspects, this paper gives the corresponding hardware structure diagram, schematic diagram, design plan and related software. Selective analyzing the Analog-to-digital conversion section, the FPGA (field programmable gate array) configuration, programming part, gigabit Ethernet transmission and temperature compensation circuit controlled by Single chip microcomputer. Finally combining the front-end detector, the performance of the data acquisition circuit board was tested and evaluated. After a series of debugging and the experiment test, which indicates that the data acquisition system can successfully complete synchronous processing and analysis of the four pulse signals produced by the front-end detection, at the same time, accomplish string and transform, integral calculation, Ethernet transmission functions. It can seek and find accurate source location combined with video acquisition in the back end software reconstruction.Data acquisition system using the technologies, differential signal processing, the ADC sampling, the FPGA configuration, the core algorithm, single chip, gigabit network transmission, temperature deviation correction, etc. Its stable performance and can meet the design requirements.