1、基于数字恒比定时的核脉冲信号时间谱仪研究,报告人：孙剑中国科学院“核探测技术与核电子学”重点实验室中国科学技术大学 近代物理系2010年 8月17日,报告内容,研究背景,原理框图,硬件结构,硬件框图,软件算法,流程框图,matlab界面,零输入本底,信号源33250A测试,零输入FFT频谱,1Mhz正弦FFT频谱,5Mhz正弦FFT频谱,1、事例率在1K/s左右；2、时间谱FWHM 1ns，相对落后于传统CFD，性能上还需改进；,真实信号,周期信号,1、误差原因：快信号前沿太快，ADC采样不足，插值幅度带来的误差2、国外水平：信号源FWHM100ps 放射源FWHM500ps,总结,1、数字处
2、理优点明显；定时精度不足；2、下一步展望：（1）、硬件改进：单通道单DSP；（2）、算法改进：去基线、fir滤波移到FPGA，定时算法改进；（3）、信号改进：模拟电路SI优化；,参考文献,L. Bardelli, M. Bini, G. Poggi, N. Taccetti, Application of digital sampling techniques to particle identification in scintillation detectors. Nuclear Instruments and Methods in Physics Research A 491 (2002
3、) 244257G. Pasqualia, R. Ciaranfib, L. Bardellia, M. Binia, A. Boianoc,F. Giannellia, A. Ordinec, G. Poggia, A DSP equipped digitizer for online analysis of nuclear detector signals. Nuclear Instruments and Methods in Physics Research A 570 (2007) 126132Analog Devices, Inc. Fundamentals of Sampled D
4、ata Systems. Application note 282. EB/OL. http:/. Analog Devices，Inc. 14 bit, 105/125 MSPS, IF Sampling ADC AD9445. EB/OL. http:/. 2005.Analog Devices，Inc. 3nv/Hz Ultralow Distortion High Speed Op Amp AD8045. EB/OL. http:/. 2005.Altera International Limited. Cyclone Device Handbook, Volume 1. EB/OL. http:/. 2008Texas Instruments, Inc. TMS320VC5416 Fixed-Point Digital Signal Processor. EB/OL. http:/. 2008Cypress, Inc. EZUSB FX2 USB Microcontroller High-Speed USB Peripheral Controller. EB/OL. http:/. 2002.,感谢您的关注,Thank You !,
