First measurements of the performance of the Barrel RPC system in CMS

During the summer 2006, a first integrated test of a part of the CMS experiment was performed at CERN collecting a data sample of several millions of cosmic rays events. A fraction of the Resistive Plate Chambers system was successfully operated. Results on the RPC performance are reported.     

多对多RPC设计模型研究

提出了多对多ＲＰＣ模型，讨论了该模型各部分的结构以及服务请求对象的内容。为了防止一个Ａｇｅｎｔ－ｇｒｏｕｐ超载，我们提出了两种多Ａｇｅｎｔ－ｇｒｏｕｐ方法。     

新型光纤电流传感器的研制

光纤电流传感器运用Faraday效应,将光纤绕在电流母线上可以方便地测得电流母线中的电流,但光纤电流传感器的信号受环境振动、温度变化的影响严重,从而限制了其应用。本文从分析振动、温度变化的干扰机理出发,提出一种新型的在线校正方法来抑制干扰的影响,并进行了原理性实验。研究结果表明,用这种方法实现的光纤电流传感器在40～400A之间有良好的线性度和精度。     

一种激光探测与波长测定装置的研究

介绍了一种主要用于夜间的激光探测与波长测定装置,它是基于激光在光学劈尖上产生干涉条纹的特点、通过傅里叶变换测定条纹间距来计算激光波长的,测试结果表明该装置在背景光微弱的情况下,性能令人满意,具有一定的实用性。     

一种ICP-MS真空测量系统的研制

本文介绍了一种基于C8051F微控制器并应用于电感耦合等离子体质谱仪(ICP-MS)的真空测量系统。系统由真空计组、预处理电路、C8051F微控制器、串行接口和上位机组成,能同时测量接口、透镜和四级杆三个部分的真空状态,且具有较高的集成度,紧凑的体积和较低的功耗,经最后实验证实,系统能准确且稳定的测量各个部分的真空度,可为ICP-MS的正常工作提供相应的条件保障。     

Some developments for a unit magnification catadioptric optical system

Some structural improvements in the 1:1 Wynne-Dyson catadioptric system are described. The improvements make the 1:1 Wynne-Dyson system usable in the deep-UV regime and broad bands and high numerical apertures become possible.     

The dynamic error of a multichannel measurement system

It is shown that the dynamic error of a multichannel measurement system containing a single analog-to-digital converter with signal source switching is not dependent on the signal waveform and is governed by the rate of change. Translated from Izmeritel’naya Tekhnika, No. 1, pp. 3–6, January, 2009.     

激光板凸度检测系统传感器位置调节方法

分析激光板凸度检测原理,根据测量间隙参数的变化,建立检测系统传感器位置状态表,将系统中传感器的位置关系分为正间隙、有效负间隙、无效负间隙三类。三种关系下系统的测量范围分别为:1)4mm以上;2)0-4mm;3)不能测量。由此提出一种传感器位置调节方法,以位置状态表作为调节判据,运用伺服跟踪技术,在检测过程中使传感器自动处于最佳的位置关系,实现检测的智能化。差动式厚度试验表明,本方法具有高效、精确、自动化程度高的特点,位置调节精度达到±1μm。     

有机/聚合物LED弱电流自动测试装置

介绍一种用于有机/聚合物LED微弱电流的自动测量装置。装置将测量参数估计理论与T形负反馈电阻网络相接合以实现高准确度微弱电流自动测量。装置电流测量范围为1fA—100mA；测量准确度为0．1％-10％R；分辨率为1fA；极限灵敏度为0．5fA。测量数据通过标准接口传输，经自动数据处理后，可提供微弱电流各分量频率谱、幅值相位谱以及随机过程的统计参数分析。     

玩具检测用温升测试系统的设计

该文针对电玩具的温升测试,详细介绍8通道温度测量系统的硬件和软件设计。热电偶信号经AD595芯片放大调理和A/D转换,通过单片机进行处理,再连接到PC机进行显示和操作。     

半导体基片表面微小高温区域的红外测温系统

利用红外辐射测温原理,设计成半导体基片上激光焦斑温度不接触测量系统。该系统由透镜成像系统、探测器、精密电动平台及相关电路和软件组成,其测温范围大,温度分辨力可达0．2K,还可得到温度-时间关系曲线;可自动测量热斑的温度分布及寻找热斑的最高温度区域;测量区域的最小直径为18μm。     

The special state standard of the unit of frequency deviation

The main characteristics of a new special state standard of the unit of frequency deviation are described.Translated from Izmeritelnaya Tekhnika, No. 1, pp. 36–39, January, 2005.     

双重磁检测器电流比较仪的开环特性研究

介绍了一种全新的直流大电流测量方法 ,这种方法是基于磁调制器和磁放大器双重磁检测器原理。文中对这种双重磁检测器的开环特性进行了理论计算和试验测试。理论计算和试验测试均表明其开环传输特性只有零安匝一个过零点 ,克服了传统磁调制器的开环传输特性曲线有若干过零点的缺陷和弊端 ,大大提高了系统闭环后的稳定性和可靠性 ,且在零安匝附近灵敏度高、线性好 ,同时具备了磁调制器和磁放大器的优点     

Lifetime replacement policy in discrete time for a single unit system

We consider, in discrete time, a single unit system which operates for a period of time represented by a general distribution. This unit is subjected to failures during operations. Some of these failures are repairable and the unit is repaired in the repair facility. When the unit experiences a non-repairable failure then it has to be replaced with a new one. We consider a replacement policy based on the lifetime of the unit. This policy can be studied from two different approaches. The first approach, named Model I, is to replace the unit by a new one when the unit attains a predetermined lifetime. The other approach, named Model II, is to close repair facility when the lifetime of the unit attains a predetermined quantity. For each model, we obtain the stationary distribution and some performance measures of interest.     

The design and mass production on Resistive Plate Chambers for the BESIII experiment

A new type of the phenolic paper laminate is used as the resistive electrodes of BESIII RPC. The surface smoothness of these laminates is comparable to that of the bakelite plates with linseed oil treating. A technique to adjust the bulk resistivity of the laminates within the range of 10⁹–10¹³ Ω cm is developed. Nowadays, about 1000 bare chambers (1200 m²) have been produced and used for BESIII MUON, and the rejection rate is only 1.5%. In this paper, we will discuss the mass production and quality control procedures of these RPCs.     

一种新型光纤电流传感器的设计

本文提出了一种新型的高压电流光纤传感器 ,该系统由具有相位压缩原理的Sagnac干涉仪光路构成 ,与通常的干涉仪相比该系统的动态测量范围扩大数百倍 ,而且系统不受外界缓变量的影响 ,系统采用相位切换技术使干涉仪保持在正交干涉状态     

高精度跟踪控制系统中电流环控制技术研究

在跟踪控制系统中,速度回路控制对象的特性对控制系统的跟踪精度有很大的影响。根据电流负反馈的基本原理,在位置、速度双闭环的基础上加入了电流反馈传感器,设计了电流环校正网络。仿真和实验表明,电流环有效地改善了速度回路控制对象的特性,提高了速度回路的低频增益,控制系统位置回路的跟踪精度约有 10 倍的提高。     

Measurement system for evaluation of the muon chambers for the LHCb experiment

In a detector with the complexity of the LHCb, where only for the muon system more than 1300 chambers, divided into 20 different types, will be used, resulting on more than 120 k channels to be readout, it is of crucial importance to study the many types of chambers to create a complete knowledge of the detector operation and to guarantee a high-quality performance during the experiment. To make it possible, a complete setup was built and a C++ based software was developed to carry out a set of measurements on the full-equipped chambers of the LHCb muon detector. The setup is made of front-end control electronics, high-voltage supply and acquisition circuitry while the software, running on a PC, remotely controls each element of the system and implements a number of automatized procedures to assess the main characteristics of the chambers.The main advantages of this system are its versatility and speed of measurement which are crucial to the experiment since there is the need to characterize every single chamber before final installation. Moreover, in this work it was proposed to measure the starting knee of the high-voltage operational plateau without the use of an external trigger by making use of the internal structure of the chambers. Two laboratories were prepared at CERN (European Laboratory for Particle Physics) to receive this system; one used to test chambers arrived from the CERN itself and the PNPI (Petersburg Nuclear Physics Institute) production sites, and one to test the chambers arrived from the INFN (National Institute of Nuclear Physics) production sites. In this document, the hardware and software setup will be presented together with the measurement-oriented implementations.     

荧光测钙装置中单色激发光源的设计和应用

为了满足胞内荧光测钙实验的需要,设计了一种新型的单色激发光源。其中,短弧氙灯发出的光经椭球反射镜聚焦后采用抛物面反射镜准直成平行光,通过光栅的衍射分光后又经过会聚物镜把光能量会聚到光纤端面,光纤的另一端面输出单色光。采用光路偏折的方法,有效地克服了灯源的噪声。结果显示,波长为340nm和380nm的光能量分别可达到30mW和120mW,能很好地满足荧光测钙实验的要求。