共查询到19条相似文献,搜索用时 46 毫秒
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在用霍尔元件测磁场时,一般采用对称测量法以消除各种附加电压的影响,当出现某会加电压大于霍尔电压这种特殊情况时,该测量方法更为必要。 相似文献
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在霍尔元件测磁场的实验过程中,由于霍尔元件无保护电路,在线路接错和操作不正常的情况下,经常造成大电流损坏霍尔元件,严重影响正常的教学工作.我们在实践中经过电路改进,增加保护电路后,有效地防止了这种故障的发生.1工作原理 霍尔元件I 端在正常工作情况下,流过I端的电流绝对值小于6mA,R1取值为330 ,其两端压降小于 2V,经 D1或 D2, W1至 Th1的门极 G,此电压达不到 Th1门极的导通电压 ugTh1不导通,流过Th1主端子T1-T2的电流为零,所以加入保护电路后对测量结果无影响.当线路不正… 相似文献
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利用霍尔效应测磁场实验的数据处理 总被引:1,自引:0,他引:1
推导了亥姆霍兹线圈产生磁场的全空间分布的普遍公式,讨论了如何确定磁感应强度的方向。就实验内容进行了实例分析,利用Matlab软件进行了相关计算,提出了利用霍尔效应测磁场实验的数据处理方法。最后,详细讨论了亥姆霍兹线圈所在平面处磁场强度相关参数的分布曲线。 相似文献
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本首先对霍尔效应测量中的系统误差作了叙述,对系统误差中的热能流引起的不等位电势提出了自己的见解,并对结果进行了评述。 相似文献
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The influence of various parameters (e.g. polarization and intensity of high frequency field, NMR relaxation times, signal to noise ratio of the measuring apparatus) on the determination of NMR resonance point of a nuclear system with exactly known value of gyromagnetic factor is discussed. Special attention is given to the case of real field, which is not stable in time. It is shown that the transverse NMR relaxation time of the nuclei in the sample has to be selected in correlation with the properties of the field (e.g. time instability, spatial inhomogeneity) and of the measuring equipment (e.g. signal to noise ratio), if the lowest obtainable uncertainty of field intensity NMR measurement is to be achieved. 相似文献
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为探索霍尔推力器通道内优化磁场的标准,本文研究了磁场强度对其放电特性的影响规律.通过在保持磁场形貌不变(“聚焦”形)下改变磁场强度的大小,使用朗缪尔探针、光谱仪等测量手段分析了工作于不同磁安特性曲线段的推力器放电特性.研究表明:当磁场强度小于优化值时,电子横越磁场的传导以近壁传导机制为主;反之,当磁场强度大于优化值时,放电电流反常变化,而现有的电子输运传导机制不能解释这种现象.
关键词:
霍尔推力器
磁场强度
放电特性 相似文献
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We review the theory and the experimental results on the Hall effect in noble metals containing magnetic impurities of transition metals. In order to illustrate the various types of observed effects, we focus succesively on selected systems: Mn, with only enhancement of the ordinary Hall effect due to the existance of different spin-up and spin-down currents; Fe and Cr, with skew scattering by magnetic impurities; MnT ternary alloys (where T is a non-magnetic impurity), with skew scattering effects due to combined spin—orbit scattering by non-magnetic impurities and spin scattering by Mn impurities. The skew scattering in Fe and Cr can be ascribed to the orbital character of the impurity moments and accounted for in an orbitally degenerate virtual bound state model. However, the anomalous temperature dependence of the skew scattering in Kondo alloys at low temperature is not well understood. We also present some magnetoresistance data in order to describe the links between the Hall effect and the magnetoresistance in magnetic alloys. In particular, we relate the skew scattering and the magnetoresistance anisotropy observed in Cr alloys. 相似文献
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A high-temperature acoustic field measurement and analysis system (HTAFS) was self-designed and developed to achieve real-time acoustic field analysis and quantitative cavitation characterization within high-temperature liquids. The acoustic signal was acquired by a high-temperature resistant waveguide and calibrated by separate compensation of line and continuous spectra to eliminate frequency offsets. Moreover, a new method was proposed to derive from the continuous-spectrum sound intensity and line-spectrum sound intensity in the frequency band above 1.5 times the fundamental frequency to characterize the intensity of transient cavitation and stable cavitation. The acoustic field characteristics within solidifying liquid Al-7 %Si alloy were successfully determined by this system. With the increase of ultrasound amplitude, the acoustic pressure in the alloy melt increased to be stable, the transient cavitation intensity first rose and then declined, and the stable cavitation intensity remained unchanged. Combined with the structural evolution of the primary α(Al) phase, the transient cavitation intensity was determined to be the dominant factor for the ultrasound-induced grain refinement effect. 相似文献
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The magnetization of iron oxide, nickel and cobalt ferrite nanoparticles was successfully measured by using a modular magnetometer. The magnetometer was built by combining stand-alone equipments usually available at most laboratories such as a Gaussmeter, an electromagnet, a current source and a linear actuator. The magnetic moment sensitivity attained was about 10−6 Am2 and the results were checked against measurements made on commercial VSM and SQUID magnetometers showing few percent errors. 相似文献
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We present new analytical and numerical results of the dynamics of reversed field current layers in the Hall limit (i.e., characteristic length scales smaller than the ion inertial length). A rapid, localized thinning of the current layer leads to the generation of a nonlinear, shocklike structure that propagates in the B x inverted Delta(n) direction. This magnetic structure is self-supportive and can lead to a nonlocal thinning of the current layer and the release of magnetic energy. 相似文献
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A theory of the generalized conductivity for the normal component of the Hall effect is developed. It is shown that the normal
Hall effect coefficient R
0 of microscopically inhomogeneous magnetic alloys GdZnxCu1−x
, which at low temperatures consist of ferro-, antiferro-, and paramagnetic phases, can be described satisfactorily on the
basis of an effective-medium theory. The experimentally observed relationship between the coefficient R
0(x) and the resistivity ρ(x) is obtained.
Fiz. Tverd. Tela (St. Petersburg) 41, 98–102 (January 1999) 相似文献