Flat-topped cusp-like shaper algorithm based on the unfolding-synthesis technique

Jimei LAN; Wencheng YIN; Yu LIU; Tong SHEN; Jinzhao ZHANG; Yangchun LENG

doi:10.11889/j.0253-3219.2024.hjs.47.010401

Journals >NUCLEAR TECHNIQUES >Volume 47 >Issue 1 >Page 010401 > Article

NUCLEAR TECHNIQUES
Vol. 47, Issue 1, 010401 (2024)

Flat-topped cusp-like shaper algorithm based on the unfolding-synthesis technique

Jimei LAN¹, Wencheng YIN², Yu LIU², Tong SHEN^1、*, Jinzhao ZHANG³, and Yangchun LENG¹

Author Affiliations

¹Southwest University of Science and Technology, Mianyang 621010, China

²China Nuclear Power Engineering Co., Ltd, Shenzhen 518124, China

³Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China

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DOI: 10.11889/j.0253-3219.2024.hjs.47.010401 Cite this Article

Jimei LAN, Wencheng YIN, Yu LIU, Tong SHEN, Jinzhao ZHANG, Yangchun LENG. Flat-topped cusp-like shaper algorithm based on the unfolding-synthesis technique[J]. NUCLEAR TECHNIQUES, 2024, 47(1): 010401 Copy Citation Text

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Fig. 1. Transfer function model of peak pulse shaping

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Definition of the shape of a flat-top peaking pulse and its derivatives (a) Shape of the pulse h(n), where na=10, nb=20, nc=30, (b) First derivative h1(n), (c) Second derivative h2(n), (d) Third derivative h3(n)

Fig. 2. Definition of the shape of a flat-top peaking pulse and its derivatives (a) Shape of the pulse h(n), where

n_{a} = 10

n_{b} = 20

n_{c} = 30

, (b) First derivative h¹(n), (c) Second derivative h²(n), (d) Third derivative h³(n)

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Fig. 3. Parameter settings for flat-top peaking pulse shaping

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Fig. 4. Photograph of experimental test setup

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Fig. 5. Digital spectroscopy measurement system

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Fig. 6. Different shaping filter effects under noise interference(a) Flat-top peaking pulse shaping, (b) Flat-top pulse shaping with a width of 0, (c) Triangular filter shaping

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Fig. 7. Recognition performance of trapezoidal shaping and flat-top peaking shaping with the same rise time and shaping time under different pileup conditions: recognition performance at (a) Pileup level

0 < l < n_{b}

, where n_a=40,

n_{b} = 80

and n_c=200, (b) Pileup level

l = n_{b}

, (c) Pileup level n_b<l<n_a+n_b (color online)

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Fig. 8. Gaussian shaping stacking identification results

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Fig. 9. Testing performance of FPGA-based digital spectroscopy system

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输入电压 Input voltage / mV	输出电压Output voltage / mV
输入电压 Input voltage / mV	平顶尖峰脉冲成形 Flat-top peaking pulse shaping	平顶宽度为0的尖峰脉冲成形 Flat-top pulse shaping with width of 0	三角滤波成形 Triangular filter shaping
40	40.07	40.14	40.13
40	40.00	40.20	40.19
40	39.92	39.20	39.36
40	40.19	40.27	40.25
40	39.78	39.83	39.80
40	40.03	40.08	40.05
40	40.07	40.06	40.08
40	39.92	39.91	39.89
40	40.02	40.10	40.12
40	39.97	39.96	39.92

Table 1. Comparison of signal amplitude using three different methods

测量时间

Measure time / min

第一次

First time

第二次

Second time

第三次

Third time

2 552

2 543

2 538

2 549

2 547

2 548

2 553

2 549

Table 2. Numerical spectrum analyzer system measurements of the characteristic peak channel address of ¹³⁷Cs

方法 Methods	峰位计数率1 Count rates 1 / s^-1	峰位计数率2 Count rates 2 / s^-1
平顶尖峰脉冲成形 Flat-top peaking pulse shaping	23.54	2 623
三角成形 Triangular shaping	24.25	2 487
梯形成形 trapezoidal shaping	22.36	2 253
高斯成形Gaussian shaping	20.52	1 877

Table 3. Comparisons of characteristic peak count rates for ¹³⁷Cs

Jimei LAN, Wencheng YIN, Yu LIU, Tong SHEN, Jinzhao ZHANG, Yangchun LENG. Flat-topped cusp-like shaper algorithm based on the unfolding-synthesis technique[J]. NUCLEAR TECHNIQUES, 2024, 47(1): 010401

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