核电子学与探测技术
覈電子學與探測技術
핵전자학여탐측기술
NUCLEAR ELECTRONICS & DETECTION TECHNOLOGY
2013年
9期
1057-1061
,共5页
颜强%洪兵%李桃生%董良%刘辉兰
顏彊%洪兵%李桃生%董良%劉輝蘭
안강%홍병%리도생%동량%류휘란
高能中子剂量仪%便携%模拟电路
高能中子劑量儀%便攜%模擬電路
고능중자제량의%편휴%모의전로
high-energy neutron dosimeter%portable%analog circuit
介绍了一种适合于便携式二元慢化型高能中子剂量仪的模拟电路系统的设计解决方案。该方案采用低噪声结型场效应管和高性能运算放大器构成具有暗电流消除功能的电荷灵敏前置放大器。前置放大器信号经极零相消后由一级二阶S-K滤波器和低通滤波器成型放大为满足后续电路需求的准高斯信号,然后经过甄别电路和单稳态成型电路把模拟脉冲变成固定宽度的数字脉冲,以便于后续数字电路的进一步处理。由Multisim电路仿真软件仿真结果和实际电路测试结果可知,在计数率从0.1~20 kHz范围内,该方案完全满足便携式二元慢化型高能中子剂量仪的信号处理要求。
介紹瞭一種適閤于便攜式二元慢化型高能中子劑量儀的模擬電路繫統的設計解決方案。該方案採用低譟聲結型場效應管和高性能運算放大器構成具有暗電流消除功能的電荷靈敏前置放大器。前置放大器信號經極零相消後由一級二階S-K濾波器和低通濾波器成型放大為滿足後續電路需求的準高斯信號,然後經過甄彆電路和單穩態成型電路把模擬脈遲變成固定寬度的數字脈遲,以便于後續數字電路的進一步處理。由Multisim電路倣真軟件倣真結果和實際電路測試結果可知,在計數率從0.1~20 kHz範圍內,該方案完全滿足便攜式二元慢化型高能中子劑量儀的信號處理要求。
개소료일충괄합우편휴식이원만화형고능중자제량의적모의전로계통적설계해결방안。해방안채용저조성결형장효응관화고성능운산방대기구성구유암전류소제공능적전하령민전치방대기。전치방대기신호경겁령상소후유일급이계S-K려파기화저통려파기성형방대위만족후속전로수구적준고사신호,연후경과견별전로화단은태성형전로파모의맥충변성고정관도적수자맥충,이편우후속수자전로적진일보처리。유Multisim전로방진연건방진결과화실제전로측시결과가지,재계수솔종0.1~20 kHz범위내,해방안완전만족편휴식이원만화형고능중자제량의적신호처리요구。
It presents a solution of an analog circuit system for a kind of portable Dual -Moderated Dose Detec-tors for High-Energy Neutrons .Using low-noise JFET and high -performance operational amplifier , a kind of charge-sensitive preamplifier with the function of dark current cancellation was set up .Signal from the pre-amplifier was processed by an analog system made up with pole -zero cancellation circuit , second order S -K filter and low-pass filter circuit to form a signal with quasi -Gaussian shape and enough amplitude , which met with the demands of subsequent digitalization circuit .The digitalization circuit was formed by a pulse amplitude discriminator , based on the Schmitt trigger , and a mono -stable trigger and the signal would become a fixed width of digital pulses , which could be read and processed by MCU -cored data acquisition system .Both re-sults from the simulation of EDA software ( Multisim) and the actual circuit test indicated that this design whol-ly met the signal-processing requirements of Dual -Moderated Dose Detectors for High -Energy Neutrons in the count rate range from 0.1~20 kHz.