为满足X射线辐射探测脉冲波形甄别器(PSD)实时性要求,提出了一种新型的数字PSD设计。应用快速模数转换(Flash-ADC)技术,在电路前端对电压脉冲采样将模拟信号数字化;用数字信号处理技术计算采到的波形与理想NaI和CsI波形模板相关系数的差,并以此特征量作为判别采到的信号是否为NaI信号的依据,经计算处理可实时给出甄别结果。用Geant4和Matlab模拟了光子从入射探测器到最后生成相关系数差的分布的整个过程。结果表明:新型数字PSD误判率小于0.5%,满足实时处理事例50ms-1计数率的要求。 In order to meet the real-time requirements of X-ray detection pulse waveform discriminator (PSD), a new digital PSD design is proposed. Using the fast analog-to-digital converter (Flash-ADC) technique, the voltage pulse is sampled at the front of the circuit to digitize the analog signal; the difference between the acquired waveform and the ideal NaI and CsI waveform template is calculated by digital signal processing technique, As a signal to determine whether the signal is NaI signal basis, the calculation and processing can be given real-time screening results. Geant4 and Matlab were used to simulate the whole process of the distribution of photons from the incident detector to the final correlation coefficient difference. The results show that the false positive rate of new digital PSD is less than 0.5%, which meets the requirement of 50ms-1 count rate in real-time processing.