电涡流传感器在铝箔厚度测量中的应用

采用双频激励的低频透射式电涡流传感器在线测量铝箔厚度,同时,检测了铝箔表面温度,从而实现了多参数检测。为了减小传感器的非线性误差,消除铝箔厚度及其表面温度间的交叉敏感对其厚度检测所带来的影响,采用免疫算法实现多参数数据拟合。实测结果表明这种数据拟合消除了铝箔表面温度对铝箔厚度测量的影响,提高了检测精度,测量范围达到1～100μm,分辨力达到0.01μm。     

冲击作用下七元石英传感器动态性能研究

石英传感器已被广泛应用于冲击波剖面应力的测量。通过1.16 GPa冲击作用下七元石英传感器与分流型、短路型单元石英传感器的对比实验研究表明:七元石英传感器测量单元的压电电流特征与短路型单元石英传感器基本相同;中心测量单元受边缘效应等因素的影响较小,压电电流斜升幅度相对最小,其性质类似于分流型单元石英传感器,可特别应用于空间非均匀冲击作用分布等的测量。     

铂电阻测温传感器的间歇电流激励方法

分析了铂电阻测温传感器自热对测量精度的影响及克服自热影响的途径,讨论了铂电阻传感器的间歇电流激励方法,分析和实验表明这是克服铂电阻自热影响的有效方法。     

一种非电耦合直流传感器的研制及应用

研制了一种非电耦合直流传感器———磁耦合传感器。该传感器主要应用磁耦合原理,当直流系统发生接地故障时,该传感器可以准确地将故障信号检测出来,故障电流的检测范围为±5mA。该传感器具有体积小、测量准确、灵敏度高、抗干扰能力强、对直流操作回路无任何影响的特点,已成功地在线运行到发电厂、变电站的直流系统接地选线之中。     

特种电流传感器

提出的特种电流传感器是在现有电流互感器的基础上增加一种新型的小型化、高准确度的电流传感器,对其工作原理、结构特性、测试结果等进行了分析和介绍,该特种电流传感器具有非接触测量、体积小、质量轻、准确度高等特点,在供电、用电和自动控制系统领域里有较好的发展前景。     

电网电流检测系统的标度变换和单片机显示

本文提出了一种用霍尔传感器测量电网电流的方法主要说明其标度变换和单片机显示的过程。     

CT-6B托卡马克的交流运行实验研究

在CT—6B托卡马克上首次实现了多周期交流运行，对多个周期中等离子体进行比较发现，尽管在每个周期的两个半周中等离子体与壁的相互作用有所不同，但等离子体中的杂质积累并未受到严重影响。通过内磁探针测量了等离子体电流密度的分布，发现等离子体电流首先从弱场区开始反相，电流反相过零时同时存在正负局部等离子体电流，此时的磁面结构有效地约束了粒子。     

The Experiment of Modulated Toroidal Current on HT-7 and HT-6M Tokamak

The Experiments of Modulated Toroidal Current were done on the HT-6M tokamak and HT-7 superconducting tokamak. The toroidal current was modulated by programming the Ohmic heating field. Modulation of the plasma current has been used successfully to suppress MHD activity in discharges near the density limit where large MHD m = 2 tearing modes were suppressed by sufficiently large plasma current oscillations. The improved Ohmic confinement phase was observed during modulating toroidal current (MTC) on the Hefei Tokamak-6M (HT-6M) and Hefei superconducting Tokamak-7 (HT-7). A toroidal frequency-modulated current, induced by a modulated loop voltage, was added on the plasma equilibrium current. The ratio of A.C. amplitude of plasma current to the main plasma current △Ip/Ip is about 12% ～ 30%. The different formats of the frequency-modulated toroidal current were compared.     

Modification of Boundary Parameters and Fluctuations by IBW and LHCD in the HT-7 Tokamak

Measurements of boundary parameters and their fluctuations have been performed in ohmic (OH) plasma and Ion Bernstein Wave (IBW) and Lower Hybrid Current Drive (LHCD) enhanced confinement plasma using a pneumatically driven Langmuir probe array on HT-7 toka-maX. In the enhanced confinement plasma~ the gradients of electron density and temperature become higher and a transport barrier comes into being in the vicinity of the limiter. The boundary potential shows a clear modification in the same region. The fluctuation levels are significantly depressed and the coherences between fluctuations are reduced evidently in the enhanced plasma.Meanwhile, we obtained the spectral features and the poloidal phase velocity of fluctuations us-ing a two-point correlation technique and found obvious modifications of the turbulence and the poloidal flow. The results suggest that the improved confinement in the IBW and LHCD enhanced plasma is at least partially due to the modification of the boundary parameters and the suppression of the boundary fluctuations and fluctuation induced fluxes.     

统一电能质量控制器的一种新型保护方法

提出并分析了统一电能质量控制器UPQC(Unified Power Quality Controller)的一种新型保护方法。配电系统中发生短路故障时，该方法可以很有效地保护统一电能质量控制器串联部分中的辽变电路。保护的核心元件是与电流互感器二次侧并联的压敏电阻器及反并联晶闸管支路，通过对晶闸管门板信号的控制使电流互感器二次侧的电压箝位在逆变电路所允许的范围内，从而实现对UPQC的有效保护。该方法通过Matlab对380V配电线路进行了数字仿真，证明了其有效性。