宽量程中子通量密度测量数字化处理系统设计

摘要

The real-time and accurate measurement of reactor neutron flux is directly related to safe operation of the reactor.Neutron flux measurement system with fission chamber based on the analog technology had some shortage, a fission chamber of digital output signal processing system was designed.The combination of two kinds of fission chamber working mode which is pulse and Campbell were applied in this system.Using high-speed ADC digitalized signal from the fission chamber, FPGA could be used in a variety of digital signal pro-cessing algorithms.And using MATLAB simulated output pulse signal of the fission chamber, which imported arbitrary waveform signal generator as neutron source, to be used in a preliminary validation of the algorithm. Test results showed that the digital processing system had good linearity and good performance.%实时准确地测量反应堆的中子通量变化状况，对于确保反应堆的安全运行有着重要意义。基于模拟测量系统存在的一些不足，设计一种数字化的宽量程裂变室输出信号处理系统。该数字化信号处理系统将裂变室的脉冲和坎贝尔两种工作模式相结合，利用高速ADC对裂变室输出脉冲信号数字化，在FPGA中运用数字信号处理算法实现两种工作模式的信号处理，并仿真了裂变室的输出脉冲信号导入任意波形信号发生器模拟中子信号源，用于对处理算法的初步验证。测试结果表明数字化处理系统线性度和性能良好。