共查询到19条相似文献,搜索用时 234 毫秒
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介绍了航空伽玛能谱谱线校正的方法,并且对经过校正航空伽玛能谱数据进行数据窗口的重组.对航空能谱仪谱漂产生的原因和航空伽玛能谱数据的处理方法进行了介绍,根据我国自主研制的航空伽玛能谱仪谱线采集的特点和谱线合成方式,提出了采用变尺度校正的方式对谱线数据进行校正,并且根据航空伽玛能谱测量的要求,对窗口数据进行重组.实验结果表... 相似文献
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传统的软件稳谱方法基于谱漂为线性漂移的假设,只利用一个主峰峰位进行校正,论文将时延估计中的相关法应用到软件稳谱,通过构造标准特征谱峰,与实际光滑后的谱峰进行相关计算寻找漂移道数。实例证明了该方法对于非线性谱漂校正性优于传统方法。 相似文献
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针对嫦娥二号γ谱的非线性谱漂特点,提出了一种基于能量对应的谱漂校正方法。选取了嫦娥二号γ谱线作为研究对象,进行谱漂校正实验。结果显示:该方法能够有效校正嫦娥二号γ谱的非线性漂移,使Fe峰和Mg/K峰的峰位漂移范围控制在±1道范围内。 相似文献
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为了解决嫦娥二号γ谱谱漂问题,提出了一种基于相关性原理的谱漂校正方法。以相关性原理为基础,介绍了嫦娥二号γ谱谱漂校正步骤,通过嫦娥二号γ谱Th元素和K元素特征峰峰位校正前后变化对比验证。实验结果显示,基于相关性原理的谱漂校正方法能够有效地缓解嫦娥二号γ谱谱漂影响,并且尽可能保持了谱线特征峰的原貌。 相似文献
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大气氡子体释放的γ射线严重影响航空γ能谱测量结果,而谱线比大气氡校正方法是航空γ能谱测量大气氡校正数学方法中校正效果较好的一种。本文在此方法的基础上提出了基于快速傅里叶变换扣除散射射线的谱线比大气氡校正方法,研究了改进后新谱线比法不同组分校正系数和高度之间的关系,建立了新谱线比大气氡校正数学模型,并提出了校正系数的地面饱和模型刻度技术。改进后的谱线比大气氡校正方法的适用性及其校正系数的刻度效率得到了提高,节省了谱线比方法应用成本,解决了传统谱线比大气氡校正方法中校正系数采用谱形拟合方法导致物理含义丢失的问题。 相似文献
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不同放射性强度的测量应用中,探测器输出核脉冲信号的基线将发生漂移,进而造成多道能谱仪的谱线漂移和能量分辨率损失。尽管采用数字基线估计方法可以对核脉冲信号的基线进行正确估计,但纯数字基线恢复算法无法有效处理核脉冲信号基线漂移对前端电路的影响。采用最小平均值基线估计方法,先在现场可编程门阵列(Field-Programmable Gate Array,FPGA)中进行数字基线估计;然后通过SPI总线将基线估计值传入微控制器(Micro-Controller Unit,MCU),MCU根据基线值判断是否进行基线调节,将基线估计值传入数模转换器(Digital-to-analog Converter,DAC);最后在前端电路中实现核脉冲信号的基线恢复。基于La Br3(Ce)探测器的测试结果表明:采用该基线自动恢复技术的数字化多道能谱仪能够实现核脉冲信号的基线自动恢复。在高放射性测量条件下,测量系统能够解决因基线漂移引起的谱线漂移问题,使系统能量分辨率保持稳定。 相似文献
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《Journal of Nuclear Science and Technology》2013,50(6):426-437
The energy spectrum of neutrons in a pile of thoria was measured from several keV to several MeV by the time-of-flight method with an electron linear accelerator and the results were compared with the theoretical ones predicted with three group constants for thorium, (1) constants of Abagyan et al.'s (ABBN), (2) newly produced constants of J AERI-FAST type (NNM) and (3) constants produced from ENDF/B-H in ORNL (DLC-2D). General agreement between measurements and calculations was seen for all cases. However, (1) the predicted spectra with ABBN and DLC-2D gave less flux by about 30% than the measured in the energy below about 100 keV, (2) similar disagreement was observed only above 10 keV for the spectrum with NNM and (3) the measured spectrum became about 20% lower than all of the predicted above 1 MeV. In parallel with the spectrum measurement, neutron spatial distribution was measured by the activation method and the results showed spherical symmetry around a photoneutron target at the center of the pile. From this fact adequancy of using one-dimensional transport code (ANISN or DTF-IV) with spherical symmetry for analysis could be verified. 相似文献
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中子能谱是反应堆的一项重要参数,为验证理论计算,常使用阈探测器活化法对中子能谱进行实际测量。为解决由于活化片数量小于能群数量而引起的解谱问题并获得较高的解谱精度,基于广义最小二乘法原理开发了解谱程序NSAGLS。使用IAEA给出的例题进行了验证,结果表明该程序能够得到正确的解谱结果。该程序可用于反应堆中子能谱的解谱,并能够考虑输入谱、核反应截面及测量活度不确定度信息对解谱结果的影响。 相似文献
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吴雪梅 《核电子学与探测技术》2009,29(4)
提出采用AR模型处理X光谱的方法.该方法将测得X光谱看作对某信号的经典谱估计,利用FFT计算原信号的自相关函数,并利用AR模型对X光谱重新估计.采用该方法处理后,光谱变得更为平滑,且提高了光谱的分辨力.实验结果证实了该方法的有效性. 相似文献
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《Journal of Nuclear Science and Technology》2013,50(7):958-966
The resonance calculation method using the ultra-fine-group spectrum calculations in the AEGIS code is explained in detail. By a simple benchmark problem, it is verified that the effect of anisotropic scattering on effective cross-sections is not very large and the isotropic scattering source approximation is adequate in practical resonance calculations in LWRs. Furthermore, some efficient numerical algorithms in the ultra-fine-group calculations to reduce the computation time without large degeneration of accuracy are presented. In addition, the SPH method for energy collapsing of cross-sections is adopted in the AEGIS code to reduce the error of energy collapsing. Through the comparison with continuous-energy Monte-Calro calculation in the pin-cell geometry, the validity of the resonance treatment in the AEGIS code is verified. 相似文献
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《等离子体科学和技术》2015,17(8):704-710
The present paper proposes an automated Laser-Induced Breakdown Spectroscopy(LIBS) analytical test system,which consists of a LIBS measurement and control platform based on a modular design concept,and a LIBS qualitative spectrum analysis software and is developed in C#.The platform provides flexible interfacing and automated control;it is compatible with different manufacturer component models and is constructed in modularized form for easy expandability.During peak identification,a more robust peak identification method with improved stability in peak identification has been achieved by applying additional smoothing on the slope obtained by calculation before peak identification.For the purpose of element identification,an improved main lines analysis method,which detects all elements on the spectral peak to avoid omission of certain elements without strong spectral lines,is applied to element identification in the tested LIBS samples.This method also increases the identification speed.In this paper,actual applications have been carried out.According to tests,the analytical test system is compatible with components of various models made by different manufacturers.It can automatically control components to get experimental data and conduct filtering,peak identification and qualitative analysis,etc.on spectral data. 相似文献
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本文提供了北京正负电子对撞机同步辐射光束线上X射线能谱的首次测量结果,文章对探测器和谱仪系统、测量方法及数据分析予以扼要的描述。 相似文献
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核能谱模拟的正态组合实现方法 总被引:3,自引:1,他引:2
结合核能谱的随机特性,探讨了核能谱的正态组合模拟方法。该方法将核能谱分解为正态分布函数的组合,进而转化为参数化模型,并对正态组合函数进行随机抽样以模拟原始能谱。该方法可以灵活地调整正态函数的个数和各正态函数的标准偏差,以满足模拟中对谱线平滑度、准确度的不同要求,是一种效果较好的参数化模拟方法。 相似文献