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超导线材短样测试装置测量系统 总被引:3,自引:0,他引:3
介绍了自行研制的超导线材短样测试装置的实时测量系统,包括温度、压力、液位、电流、电压降测量5个方面.该系统基于计算机和MCGS组态软件,选用合适的传感器和测量方法,采用A/D数据采集卡实现超导线材短样测试装置数据的实时显示和记录.测量系统具有操作简便、运行可靠等优点,已经通过与超导线材短样测试和超导磁体失超等实验,给出实验结果.这些结果表明,测量系统能满足超导线材短样测试装置的各项数据测量要求.该系统实现了低温测量和电量测量的有机结合,其成功研制为应用超导低温制冷系统的数据采集提供了参考. 相似文献
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提出了利用脉冲磁场对超导材料HC2和JC(H)的测量方案,并研制出了测试装置,对NbTi,Nb3Sn,Nb3Ge及掺TiNb3Sn等超导材料的HC2和(HC(H)进行了测量,得到了理想的测试结论和有益的测试经验。 相似文献
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为了准确测出镁合金抗微蠕变性能,采用单轴拉伸法对镁合金进行室温蠕变试验,开发了镁合金微蠕变测量系统,解决了测量微蠕变关键技术问题,提出采用高精度位移传感器、恒温箱、测量放大器以及设计专用蠕变变形测量装置,构成镁合金微蠕变测试系统。试验结果表明,该系统精度高、性能稳定,可精确测试镁合金室温蠕变稳态速率和应变量,镁合金ZM6室温(35℃)下的蠕变应变为0.02%,最小稳态蠕变应变速率为10^-10。S^-1。 相似文献
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要本文通过对超导电阻特性的分析研究,提出了一种基于微弱信号检测的超导体电阻测量的新方案。论述了微弱信号检测应用于超导电阻测量的可行性。系统通过微弱信号检测中的相关检测方法实现超导电阻信号的提取,尽可能的去除噪声信号。并采用TMS320VC5509A进行信号处理,通过软件编程实现相关检测,提高信号质量。系统运行稳定,并充分显示出了自身在超导体电阻测量等微弱信号检测方面的优越性。 相似文献
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Yong-Sun Cho Byung-Ik Jung Hyo-Sang Choi 《Journal of Superconductivity and Novel Magnetism》2013,26(4):1253-1258
In this study, a new concept is proposed on a combination device with functions of a commercial transformer and a superconducting fault current limiter (SFCL). This device serves as a transformer by stepping the voltage up or down in normal condition. When a transient phenomenon occurs in the power system, it serves as an SFCL to limit the fault current. The device quickly detects the line current using a current transformer (CT), and is based on the high-speed, silicon-controlled rectifier (SCR) interrupter operation. This is done by identifying the fault using an SCR switching control system. The test results showed that the fault current was limited by the impedance of the superconducting element a half cycle after a fault occurred. An SCR that initially had a normally open contact was turned on within a half cycle. However, an SCR with a normally close contact was turned off after a half cycle because the current dropped below the holding current after a half cycle. The voltage of the superconducting element was low in the step-down turn ratio condition of the transformer. This was because the secondary and tertiary windings were connected in series due to the SCR-1 turn-off condition, and the sum of voltages on each winding appeared on the superconducting element. By combining the existing power device technology and an SFCL technology, it is expected that the existing problems of an SFCL can be addressed to construct a smart power system. 相似文献
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针对现有的全自动堆取料机技术的发展过程中存在料堆高程模型获取困难、测量装置环境适应性差、成本高和模型精度低的问题,提出利用77GHz毫米波雷达、差分北斗和角度编码器的集成技术获取大型料堆表面的离散点云数据。推导出多传感数据融合获取离散点云数据的公式,并提出采用量子化鸽群优化Kriging插值算法获取料堆的数字高程模型(DEM),采用交叉验证的方式对比分析了优选参数后改进的普通Kriging、普通Kriging、反距离加权、基于三角剖分的线性和自然邻域插值算法,改进后的Kriging插值算法均方根误差低于0.37m,均方误差低于0.14m,均方根误差相比普通Kriging插值算法降低了39.9%。在现场的测试过程中,该方法可不受天气和粉尘的影响得到料堆的DEM,能够满足堆取料机全自动项目对精度的需求。 相似文献
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Yong Ren Futang Wang Guangli Kuang Wenge Chen Yunfei Tan Jiawu Zhu Peng He 《Journal of Superconductivity and Novel Magnetism》2011,24(5):1687-1691
Mutual inductance and force calculations between coaxial Bitter coils and superconducting coils with rectangular cross section
in a hybrid magnet system using derived semi-analytical expressions based on two integrations were performed. The mutual inductance
and force calculations are based on the assumption of the uniform current density distribution in superconducting coils. The
current density distribution of a Bitter coil in radial direction, however, is inversely proportional to the radius of the
Bitter coil. The influence of the current density redistribution caused by a cooling hole and an inhomogeneous temperature
distribution of Bitter coil of a water-cooled magnet was not considered. The obtained expressions can be implemented by Simpson’s
integration with FORTRAN programming. We confirm the validity of mutual inductance calculation by comparing it with a filament
method, and give the accuracy of two methods. The mutual inductance values computed by two methods are in excellent agreement.
The derived semi-analytical expressions of mutual inductance allow a low computational time compared with filament method
to a specific accuracy. The force is derived by multiplying the currents of the two coils by their mutual inductance gradient. 相似文献
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在分析传统万能工具显微镜及现代数字化仪器优缺点的基础上,提出了一种基于图像处理的万能工具显微镜的测量方法。该方法将图像处理技术与基于FPGA和单片机的光栅测量技术相结合,在保证原有仪器的准确度高、抗干扰能力强、稳定性好、应用范围广优点的基础上,运用AutoCAD二次开发技术实现对长度、角度、圆直径等几何量的精密测量,提高了测量效率和精度,降低了操作人员的劳动强度。经过与双频激光干涉仪的测试结果进行比较,证明提出的方法具有较高的重复性和测量精度。 相似文献
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氦气净化技术是国家大科学工程北京正负电子对撞机重大改造(BEPC-Ⅱ)中低温系统的关键技术之一.在充分调研国内外大型低温系统氦气净化技术的基础上,结合自身情况,创造性提出氦气储罐内部处理及真空置换方案,一次性充入氦气,将储罐内氦气不纯度控制在40 vpm之内,同时辅之以80 K外置低温吸附器对氦气储罐内以及冷箱和超导设备端的氦气进行净化.高效而又经济的解决了BEPC-Ⅱ低温系统中的氦气纯度问题,成功地进行了制冷机的验收测试和超导设备的调试及运行. 相似文献