| According to the issues of high cost, large size, limited scope of using of nuclear spectral analysis software for traditional PC platform, and the technical bottlenecks of single-core processor spectrometer faces in real-time, controllability and other complex spectral data processing, a nuclear energy spectrum data processing system based on ARM/DSP platform is designed and implemented in this paper. The system takes the TI DM3730 core of Dev Kit8500 D evaluation module as the experimental platform, using ARM-Linux operating system, DSP-side processing spectral data acquired by nuclear detector, and then processed data was transmitted to ARM side via DSP Link mechanism,with the help of small size, easy to transplant scientific computing software Octave calls GNUplot library data to load and process nuclear spectrometry data, and spectrum data is visually displayed on the TFT LCD screen for scientific staff to real-time read, analysis,process in the field.Paper realizes the system platform construction, divided into the hardware platform selection and the software platform design. Hardware platform selection, wherein the processor core selection; Dev Kit8500 D core chip DM3730 with powerful data processing capability and good control systems, stand out in a number of embedded processors, is suitable for spectrum system of real-time control and complex data processeing Embedded Linux software platform design, including tool chain setting, a first level startup code X-Loader, a second level startup code U-Boot, the kernel u Image,Ramdisk and UBI file system compilation and transplantation, and file system making,kernel customization. LCD display, touch screen driver programming success, staticly loaded into the system kernel, the display touch screen start working after the system updates, providing friendly interface and human-computer interaction. DSP Link communications is solved, and based on TI company provides DVSDK software architecture, the data transmission of ARM and DSP heterogeneous dual-core inside DM3730 is realized, ARM with the help of DSP Link software module can directly access the DSP chip RAM data, both of them work coordination, performance is significantly improved. For transplantation of Octave, the necessary dependent libraries and header files are added and compiled, crossing compiled Octave is transplanted to Dev Kit8500 D platform by ext2 format MMC/SD card which can be identified by Linux.Finally, on the portable spectrum instrument system of environmental radioactive actual testing, nuclear spectrum visual effects and intuitive, able to really read channel address with the count at any point of the line in real time, providing for professional and technical personnel in-depth study. Nuclear spectrometry data test results show that the high efficiency of data processing, good real-time performance of system solutions,heterogeneous dual-core coordination work is 3-4 times of the traditional single-core nuclear spectrum in terms of system efficiency, and the system has good stability,portability, with a strong practical value and wide application prospect. |
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