Real time trapezoidal shaping algorithm at high count rates
HUANG Yuyan, GONG Hui, LI Jianmin
Key Laboratory of Particle and Radiation Imaging of Ministry of Education, Department of Engineering Physics, Tsinghua University, Beijing 100084, China
Abstract：A trapezoidal shaping algorithm was developed for common exponential nuclear signals and the pile-up effect at high count rate was studied. Deconvolution was used for time-of-arrival estimates to effectively improve the ability to recognize pile-up pulses and reduce the pile-up effect on the energy resolution. A complete pulse height analyzer was built in LabVIEW to realize real time trapezoidal shaping, pile-up recognition and spectrum construction in the field-programmable gate array (FPGA). Measurements with an X-ray diffractometer with a silicon drift detector (SDD) give a 2.46% energy resolution at a count rate of 1.8×105 cps (counts per second).
黄宇雁, 宫辉, 李荐民. 高计数率下的实时梯形成形算法[J]. 清华大学学报（自然科学版）, 2017, 57(5): 521-524.
HUANG Yuyan, GONG Hui, LI Jianmin. Real time trapezoidal shaping algorithm at high count rates. Journal of Tsinghua University(Science and Technology), 2017, 57(5): 521-524.
Radeka V. Trapezoidal filtering of signals from large germanium detectors at high rates [J]. IEEE Transactions on Nuclear Science, 1972, 99(3): 525-539.
[2]
肖无云, 魏义祥, 艾宪芸. 数字化多道脉冲幅度分析中的梯形成形算法[J]. 清华大学学报: 自然科学版, 2005, 45(6): 810-812.XIAO Wuyun, WEI Yixiang, AI Xianyun. Trapezoidal shaping algorithm for digital multi-channel pulse height analysis [J]. Journal of Tsinghua University: Science and Technology, 2005, 45(6): 810-812. (in Chinese)
[3]
Bolic M, Drndarevic V. Digital gamma-ray spectroscopy based on FPGA technology [J]. Nuclear Instruments & Methods in Physics Research, 2002, 482(3): 761-766.
[4]
Bolic M, Drndarevic V. Processing architecture for high count rate spectrometry with NaI(Tl) detector [C]//IEEE Instrumentation and Measurement Technology Conference Record. Victoria, BC, Canada: IEEE Press, 2008: 274-278.
[5]
Cano-Ott D, Tain J L, Gadea A, et al. Pulse pileup correction of large NaI(Tl) total absorption spectra using the true pulse shape [J]. Nuclear Instruments & Methods in Physics Research, 1999, 430(2): 488-497.
[6]
Wong W H, Li H. A scintillation detector signal processing technique with active pileup prevention for extending scintillation count rates [J]. IEEE Transactions on Nuclear Science, 1998, 45(3): 838-842.
[7]
Haselman M D, Pasko J, Hauck S, et al. FPGA-based pulse pile-up correction with energy and timing recovery [J]. IEEE Transactions on Nuclear Science, 2012, 59(5):1823-1830.
[8]
Ehrenberg J E, Ewart T E, Morris R D. Signal-processing techniques for resolving individual pulses in a multipath signal [J]. Journal of the Acoustical Society of America, 1978, 63(6): 1861-1865.
[9]
Bolic M, Drndarevic V, Gueaieb W. Pileup correction algorithms for very-high-count-rate gamma-ray spectrometry with NaI(Tl) detectors [J]. IEEE Transactions on Instrumentation & Measurement, 2010, 59(1): 122-130.
[10]
LIU Zhenzhou, CHEN Jinxiang. A Monte Carlo based technique for analysing gamma-ray spectra [J]. Measurement Science & Technology, 2008, 19(8), 085102.
[11]
Meng L J, Ramsden D. An inter-comparison of three spectral-deconvolution algorithms for gamma-ray spectroscopy [J]. IEEE Transactions on Nuclear Science, 2000, 47(4): 1329-1336.
[12]
Imperiale C, Imperiale A. On nuclear spectrometry pulses digital shaping and processing [J]. Measurement, 2001, 30(1): 49-73.
[13]
陈新光, 李翔宇, 孙义和. 粒子探测器读出电路数字滤波器设计[J]. 电子产品世界, 2010, 17(10): 29-31.CHEN Xinguang, LI Xiangyu, SUN Yihe. Particle detector readout circuits digital filter design [J]. Electronic Engineering & Product World, 2010, 17(10): 29-31. (in Chinese)
2017, Vol. 57 
