Research And Development Of Nuclear Data Acquisition System Based On ARM And μC/OS-Ⅱ

The data collecting systerm in apparatus of Measuring nuclear energy spectrum, with the body of Multi-Channel Analyzer (MCA), involvs detection technology, electron technology, and computer and can analyze the concerned information and parameter of nuclide accurately and fleetly. It has applied to the uranium mine perambulation, geological mapping, oil gas perambulation fields as well as seeking various metal and metalloid mineral, carrying out building material and the environment radiation at present.With the development of embedded system , 32 bit microcontroller unit has been introduced, with the representative of ARM.This improves the precision and rate of collection,and the naturalization of embedded operating system makes for the expand and integration.The nuclear data collecting systerm to be introduced,regarding ARM-μC/OS- II as the platform, and gathers the GPS receiver and GPRS Data Terminal unit in it. It was detailed to expatiated the key techniques of the Multichannel Analyzer,the interface design of LPC2148,a controller in ARM. This system can communicate with the GPS-OEM module by the UART interface,collecting the GPS information synchronously as well as nuclear data.And then save and display them or pass them to the host computer by the GPRS net.This work was supported by a grant from the Ph.D. Programs Foundation of Ministry of Education of China, "research of portable nuclear geophysics data collection system based on 3GS technology" (project number, 20040616014). The features and improvements as follows:(1)Selection of rail-to-rail operational amplifiers has improved peak detection circuit and increased the peak of the pulse measurement accuracy.(2)The Nuclear Data Collecting System with 32 bits ARM microcontrollers LPC2148 as the core and its External circuit with LCD display,has low power consumption, small size and cost-effective characteristics Etc.(3)Achieve a nuclear data acquisition system for GPS, GPRS Module integration.(4)Complete the transplant of theμC/OS-II operating system on the LPC2148 ,the operating system structures, the functional modules design and integration.