基于LabVIEW的核能谱数据采集系统

阐述了基于虚拟仪器的采用LabVIEW和通用数据采集卡开发核能谱数据采集系统的全过程.它采取了连续采样和幅度提取的方法,直接对核探头输出的电压脉冲信号进行定性和定量分析.经测试,系统能满足实际测量的要求,并且可以根据需要进行扩展.     

统计均匀分布脉冲幅度谱产生器

本文描述一种时间幅度二维随机脉冲发生器,它产生一种时间随机、幅度统计均匀分布的脉冲幅度谱,在谱的高端外侧还设立有一高分辨率的稳定幅度脉冲用作参考峰。本产生器可代替放射源信号对多道分析器(MCA)或计算机数据获取与处理系统以及核仪器进行测试和检验,特别是对高计数率下,MCA道址漂移和幅度分辨率的精密测量。     

新型随机核脉冲信号发生器设计

本文设计了一种基于FPGA和C#程序的随机核脉冲信号发生器。该脉冲信号发生器以高斯脉冲为基础,利用线性反馈移位寄存器产生均匀分布随机数,并根据核素特征谱线进行抽样,使输出高斯脉冲信号的幅度满足特征谱线的概率密度分布函数。系统具有电路简单,分辨率高,抗干扰能力强等优点。利用多道分析系统对241Am、109Cd、188Re、60Co四种放射性核素的模拟信号进行测试,结果表明:该信号发生器能够产生模拟核素特征谱线的高斯脉冲,并具有较高的稳定性和可靠性。     

多功能智能缓存—计算机脉冲分析系统

原智能多道缓存—计算机脉冲分析系统是用于脉冲幅度分析的。但在许多应用场合,除了要进行幅度测量外,还要研究计数率随时间快变化的过程,即要进行多路定标测量。为此,我们开展了多功能智能多道缓存—计算机脉冲分析系统的研制。     

基于交叉采样技术的多道脉冲幅度分析仪设计

为提高核脉冲信号幅度分析精度,本文设计的多道脉冲幅度分析仪采用多片AD7626交叉采样方式提高系统的实时采样率,弥补单片ADC芯片低采样率的不足;使用时钟分配芯片AD9522为时间交叉采样提供精确的转换时钟;FPGA上构建SOPC系统和各功能模块实现时间交叉采样的控制、数字信号读取重组以及脉冲幅度数字化分析处理。通过对设计的多道脉冲幅度分析仪进行谱线采集测试,结果表明其可应用于伽玛能谱测量领域。     

利用统计均匀分布脉冲幅度谱产生器测试MCA的最大可测脉冲率

利用统计均匀分布脉冲幅度谱(RUPAS)产生器,研究了多道分析器(MCA)在高计数率工作条件下道址偏移和幅度分辨率改变的某些性质,测定了几种MCA的最大可测脉冲率。测量结果表明:对于给定的脉冲率与脉冲宽度,MCA的道址偏移Δm与随机脉冲幅度平均值E成正比,幅度分辨率Δδ的改变与E成非线性关系。在测试最大脉冲率v_(max)时,用道址相对偏移S,作为鉴别标准比用绝对偏移Δm更为合理。     

单次脉冲毫微秒时间测量

一、引言近年来,测量快的脉冲事件之间时间间隔基本上有三种方法,即直接计数法,模拟法和混合法。其中模拟法是基于电容器充放电原理,包括时间-时间扩展和时间-幅度变换方法在内。比直接计数法时间分辨好,如果把时间-幅度变换器和多道分析器结     

一种新的死时间内事件丢失的补偿方法及其实现

用计数的方法解决脉冲幅度分析器系统的谱峰幅度损失问题，然后根据丢失脉冲的个数进行补偿是解决幅度分析系统中死时间问题的有效方法，详细介绍了这种死时间内事件丢失补偿的方法原理及其在实际中的应用。     

多道脉冲幅度分析器的发展及趋向

一、引言多道脉冲幅度分析器(简称多道分析器)是为满足核物理能谱分析的需要而研制出来的核子仪器。它能把射线所产生的脉冲讯号按幅度进行分类,从而确定射线的能量和强度。还可以附有获取射线在时间和空间位置方面的数据。通常这种类型的设备均具有一些简单的数据处理功能:例如,全谱的积分、感兴趣谱段的求和、两个谱的相加或相减等等。     

基于DSP技术的多道核脉冲幅度分析器的设计

介绍以DSP2407芯片为核心,采用专用峰值幅度采样保持电路,根据输入信号上升沿及峰值信息进行分析的多道核脉冲幅度分析器系统的原理和硬件结构.在合金分析及同位素密度成像系统中,采用本脉冲幅度分析器进行高速数据采集,取得了满意的效果.也可适用于其他核脉冲信号峰值幅度分析的场合.     

采用虚拟场景技术的高温气冷堆仿真系统研究

仿真系统对10 MW高温气冷堆的堆芯、主回路系统和蒸汽发生器等部件进行分析计算,模拟稳态和瞬态过程。采用虚拟场景技术,按高温气冷堆的实际结构建立三维虚拟场景,用户可在虚拟场景中漫游观测,实时查看仿真计算状态;同时可对仿真数据结果进行分析并以二维、三维图形显示。该仿真系统不仅对高温气冷堆的工程设计、安全分析和人员培训有重要作用,且可以对HTR-10主控室的操作人员进行现场支持及各项研究提供帮助。     

核设施退役虚拟仿真系统框架研究

退役核设施具有放射性,其退役过程危险且复杂,基于虚拟现实等技术的退役虚拟仿真系统可为退役工程提供辅助工具。本文在分析国内外研究成果的基础上,结合一专项退役工程的需求提出了该虚拟仿真系统的功能模块组成。基于软件开发技术进一步给出了系统的框架结构,并对各模块实现的相应技术进行了分析和探讨。分析中结合了计算机软硬件技术的最新研究成果,对退役中的切割、爆破、流体及放射性等的仿真技术进行了探讨。分析表明,基于普通个人计算机也可实现退役过程的全面虚拟仿真。经专家论证本方案具有可行性。     

Deployment analysis and remote accessibility verification for a maintenance task in a PRIDE digital mock-up

This study introduces an advanced modeling and simulation system that can verify and optimize a maintenance procedure at the early design stage of a virtual engineering system. System architecture, which is composed of modules used to analyze deployment of devices that deal with radioactive materials in a digital mock-up, and modules used to simulate accessibility of a remote manipulator for maintenance tasks, are discussed. Based on this architecture, new technology that enables a maintenance analyst to analyze pyroprocessing is proposed. Workspace analysis for remote manipulators, which can optimize a maintenance task at the radiation control area, is introduced. The mathematical background, with respect to the forward and inverse kinematics for a virtual manipulator accessing devices in a virtual environment, is described to establish a remote accessibility. Virtual prototyping is illustrated to carry out an experiment on the deployment analysis of devices and remote accessibility by a haptic device.     

某型虚拟冲击器的设计及数值模拟

虚拟冲击器能够吸入空气中的气溶胶并收集特定粒径的颗粒。一般来说,常用的虚拟冲击器的切割粒径较大,工作流量也较大,对于某些限制流量的工况可能不适用。在本研究中,开发了一种新型多缝虚拟冲击器,且喷嘴附近注入清洁空气,能够减小气溶胶在冲击器内的损失。通过数值模拟的方法分析该虚拟冲击器的性能,结果表明,即使总流量为36 L/min,也能获得0.08 atm的低压降,利用具有清洁空气的狭缝喷嘴虚拟冲击器,可将切割粒径降到0.2~0.4 μm,并以1.8 L/min的流量收集起来。     

设计S—N曲线的概率估计和ASME法的可靠性评价

基于ＬａｎｇｅｒＳ－Ｎ曲线,提出了设计Ｓ－Ｎ曲线的概率估计方法和ＡＳＭＥ法的可靠性评价方法。Ｐ－Ｓ－Ｎ曲线由文中提出的广义极大似然法估计。方法可应用于处理具有双随机性特征的Ｓ－Ｎ数据,并可推广应用于处理应力控制成组法疲劳试验和极大似然法试验得到的Ｓ－Ｎ数据。     

Rebuilding of the UHV System of a 10 MeV Electron Linac

The virtual installation and the virtual control become more and more important in accelerator design. By using the design software, we can achieve virtual design and installation quickly and easily.     

Real-time virtual EAST physical experiment system

As a large fusion reaction device, experimental advanced superconducting tokamak (EAST)’s internal structure is complicated and not easily accessible. Moreover, various diagnostic systems and complicated configuration bring about the inconveniency to the scientists who are unfamiliar with the system but interested in the data. We propose a virtual system to display the 3D model of EAST facility and enable people to view its inner structure and get access to the information of its components in various view sights. We would also provide most of the diagnostic configuration details together with their signal names and physical properties. Compared to the previous ways of viewing information by reference to collected drawings and videos, virtual EAST system is more interactive and immersive. We constructed the browser-oriented virtual EAST physical experiment system, integrated real-time experiment data acquisition, plasma shape visualization and experiment result simulation in order to reproduce physical experiments in a web browser. This system used B/S (Browser/Server) structure in combination with the technology of virtual reality – VRML (Virtual Reality Modeling Language) and Java 3D. In order to avoid the bandwidth limit across internet, we balanced the rendering speed and the precision of the virtual model components. Any registered user can view the experimental information visually and efficiently by logining the system through a web browser. The establishment of the system provides the framework basis for a comprehensive virtual EAST cooperative physical experimental environment.     

中性束注入器水流热量计系统优化分析

介绍了用于计算中性束注入实验中束流功率沉积的水流热量计系统优化及优化后的测试结果。前期的水流热量计系统利用串口传输和分散式牛顿模块采集,采样率低、传输速度慢、抗干扰能力差、无法满足实验要求;优化后的系统基于虚拟仪器,采用TCP\IP协议传输和虚拟仪器技术,提高了系统的采样率和精度、优化了数据传输速度及抗干扰能力。优化后的系统经测试可以准确监测中性束注入器装置上各热承载部件冷却水的温升及流量,并分析得到中性束注入时束流在各热承载部件上的功率沉积。实验结果表明优化后的系统工作稳定,使用灵活,数据准确,满足实验要求。     

Techniques for CAD reconstruction of `as-built'' environments and application to preparing for dismantling of plants

Electricité de France is using CAD-generated numeric geometrical models to simulate maintenance operations and enable optimizing maintenance procedures. These models are also used to program the machines or robots for certain servicing procedures. They are used in the operator interfaces for robot control, and provide the operator with virtual cameras or enable generating specific information (such as virtual force feedback). Even more recently, CAD models have been integrated in what is known as ‘virtual reality' software, giving the operators a sensation of ‘immersion' in a virtual universe. Depending on the need and on the type of results expected from the simulations, one needs more or less precise models of the environment in which work will be performed. EDF is using several techniques to get ‘as-built' models of the environments. This article describes the SOISIC system, which is a 3D laser sensor widely used for environment data acquisition, associated with 3Dipsos software, for CAD model reconstruction. These techniques, and the applications subsequently developed for maintenance applications, can be used in preparing and carrying out dismantling operations: ‘as-built' CAD modeling of the installation can be used in the preparatory phase, providing plans, simulating the various steps, calculating waste volumes, helping in optimization of waste management, etc. These models can also be used during the actual dismantling process, to program the machines or robots used, or in the robot or machine supervisory system. Some of the presented techniques have been used in a room in the Brennilis plant, which is currently being dismantled.     

Analysis and validation center for ITER RH maintenance scenarios in a virtual environment

A facility for detailed simulation of maintenance processes in the ITER Hot Cell Facility (HCF) has been taken into operation. The facility mimics the Remote Handling (RH) work-cells as are presently foreseen. Novel virtual reality (VR) technology, extended with a physics engine is used to create a realistic setting in which a team of Remote Handling (RH) operators can interact with a virtual Hot Cell environment. The physics engine is used to emulate the Hot Cell behavior and to provide tactile feed-back of the (virtual) slave. Multi-operator maintenance scenarios can be developed and tested in virtual reality. Complex interactions between the RH operators and the HCF control system software will be tested. Task performance will be quantified and operational resource consumption will be estimated.