Nowadays, digital methods are used in nuclear detection instruments which are more popular than conventional signal processing. In this work, a digital α-particle spectrometer, compatible with the low-cost digitizers, was designed and constructed. Similar to the analog pulse-height analyses, the digital signals must also be carefully shaped. Here, the charge pulses induced by alpha particles were measured in a silicon PIN-diode detector. Then, a digital sparsity-based pulse-processor was introduced for shaping the charge signals that were digitized by a low sampling rate digitizer. To this end, a charge-sensitive pre-amplifier was designed and fabricated for coupling to the digitizers. To perform off-line analysis, the detector pulses were stored through a combination of a fast-digital oscilloscope and the LabVIEW software. Finally, the pulse-height spectrum was obtained by a digital multi-channel analyzer block. The performance of the designed filter was examined for Ra-226 alpha spectrum by comparing its output with those of other conventional filters. Our results show the advantages of the sparsity-based filter in high-resolution measurements. The designed filter achieved an energy resolution of 12.3% at 4.78 MeV alpha particles.

如今，核检测仪器中使用的数字方法比常规信号处理更受欢迎。在这项工作中，设计并构造了与低成本数字化仪兼容的数字α粒子光谱仪。与模拟脉冲高度分析类似，数字信号也必须经过精心整形。在此，在硅PIN二极管检测器中测量了由α粒子感应的电荷脉冲。然后，引入了基于数字稀疏性的脉冲处理器，以对由低采样率数字化仪数字化的电荷信号进行整形。为此，设计并制造了电荷敏感的前置放大器，以耦合到数字转换器。为了进行离线分析，检测器脉冲通过快速数字示波器和LabVIEW软件的组合存储。最后，脉冲高度频谱是通过数字多通道分析仪模块获得的。通过将Ra-226α光谱的输出与其他常规滤波器的输出进行比较，检查了设计滤波器的性能。我们的结果表明了基于稀疏性的滤波器在高分辨率测量中的优势。设计的滤波器在4.78 MeVα粒子处实现了12.3％的能量分辨率。